Engineering › Mechanics of Materials

Mechanical stress and fatigue analysis

Works Count: 39556

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Description

This cluster of papers focuses on the finite element simulation, experimental validation, and various aspects of fretting wear, including wear mechanisms, high-temperature sliding wear, fretting fatigue, surface modification technologies, oxidational wear, corrosion fatigue, and wire rope behavior.

Keywords

Fretting Wear; Finite Element Simulation; Experimental Validation; Wear Mechanisms; High-Temperature Sliding Wear; Fretting Fatigue; Surface Modification Technologies; Oxidational Wear; Corrosion Fatigue; Wire Rope

Review of oxidational wear

1983-10-01

T.F.J. Quinn

Form und Bau der Gelenkknorpel in ihren Beziehungen zur Funktion

1925-01-01

A. Benninghoff

DYNA3D: A nonlinear, explicit, three-dimensional finite element code for solid and structural mechanics, User manual. Revision 1

1993-11-01

R.G. Whirley , B.E. Engelmann

This report is the User Manual for the 1993 version of DYNA3D, and also serves as a User Guide. DYNA3D is a nonlinear, explicit, finite element code for analyzing the … This report is the User Manual for the 1993 version of DYNA3D, and also serves as a User Guide. DYNA3D is a nonlinear, explicit, finite element code for analyzing the transient dynamic response of three-dimensional solids and structures. The code is fully vectorized and is available on several computer platforms. DYNA3D includes solid, shell, beam, and truss elements to allow maximum flexibility in modeling physical problems. Many material models are available to represent a wide range of material behavior, including elasticity, plasticity, composites, thermal effects, and rate dependence. In addition, DYNA3D has a sophisticated contact interface capability, including frictional sliding and single surface contact. Rigid materials provide added modeling flexibility. A material model driver with interactive graphics display is incorporated into DYNA3D to permit accurate modeling of complex material response based on experimental data. Along with the DYNA3D Example Problem Manual, this document provides the information necessary to apply DYNA3D to solve a wide range of engineering analysis problems.

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Numerical experiments on localization in frictional materials

1989-01-01

Peter Cundall

On fretting maps

1988-09-01

O. Vingsbo , Staffan Söderberg

Junction growth in metallic friction: the role of combined stresses and surface contamination

1959-06-09

David Tabor

This paper extends earlier work on the adhesion mechanism of friction and considers in particular the growth in area of contact as the tangential force is increased to the point … This paper extends earlier work on the adhesion mechanism of friction and considers in particular the growth in area of contact as the tangential force is increased to the point at which gross sliding occurs. The earlier studies assumed that the area of true contact A is the same as that produced under static loading so that A = W / p 0 where W is the normal load and p 0 the plastic yield pressure of the metal. If the junctions have a specific shear strength s , the friction F , that is the force to shear them, will be F = As and the coefficient of friction becomes μ = s / p 0 (Bowden & Tabor 1954). Recent studies, however, show that as the tangential stress is applied the area of true contact increases according to a relation of the type p 2 + αs 2 = p 2 0 where p is the normal and s the tangential stress in the contact region and α an appropriate constant. With thoroughly outgassed metals, junction growth generally proceeds until practically the whole of the geometric area is in contact and coefficients of friction of the order of 50 or more are observed (Bowden & Young 1951). If the interface is contaminated, the stresses transmitted through it cannot exceed the critical shear stress of the interface. The new point developed in this paper based on the work of Courtney-Pratt & Eisner (1957), is that until the shear stress reaches this value junction growth occurs as for clean metals. Beyond this point, however, further junction growth is impossible and gross sliding occurs within the interfacial layer itself. The analysis given here shows that if the interface is only 5% weaker than the bulk metal, junction growth ceases and gross sliding occurs when the coefficient of friction is of the order of unity. This corresponds to the experimental observation that minute amounts of oxygen or air reduce the friction of thoroughly clean metals from extremely high values to values of about 1. In the presence of a lubricant film the transmissible stresses are so small that little junction growth can occur before sliding takes place. The expression for the coefficient of friction now reduces to a form resembling that given by the earlier simpler theory, namely μ = s i / p 0 , where s i is the critical shear stress of the lubricant layer. The present treatment thus incorporates the effect of combined stresses and surface contamination into a more general theory of metallic friction.

NUMERICAL MODELLING OF DISCONTINUA

1992-02-01

Peter Cundall , R.D. Hart

Discrete element methods are numerical procedures for simulating the complete behaviour of systems of discrete, interacting bodies. Three important aspects of discrete element programs are examined: (1) the representation of … Discrete element methods are numerical procedures for simulating the complete behaviour of systems of discrete, interacting bodies. Three important aspects of discrete element programs are examined: (1) the representation of contacts; (2) the representation of solid material; and (3) the scheme used to detect and revise the set of contacts. A proposal is made to define what constitutes a discrete element program, and four classes of such programs are described: the distinct element method, modal methods, discontinuous deformation analysis and the momentum‐exchange method. Several applications and examples are presented, and a list is given of suggestions for future developments.

The Influence of Crack Face Friction and Trapped Fluid on Surface Initiated Rolling Contact Fatigue Cracks

1988-10-01

A. F. Bower

A two-dimensional model of a surface initiated rolling contact fatigue crack has been developed. The model takes into account the effects of frictional locking between the faces of the crack, … A two-dimensional model of a surface initiated rolling contact fatigue crack has been developed. The model takes into account the effects of frictional locking between the faces of the crack, and the influence of fluid pressure acting on the crack faces. The model has been used to investigate three possible mechanisms for propagating the cracks: mode II crack growth due to the cyclic shear stresses caused by repeated rolling contact; crack growth due to fluid forced into the crack by the load; and crack growth due to fluid trapped inside the crack. The predictions of the theory are compared with the behaviour of contact fatigue cracks.

A review of crack closure, fatigue crack threshold and related phenomena

1994-11-01

A.K. Vasudeven , K. Sadananda , N. Louat

Plastic deformation and sliding friction of metals

1979-04-01

D.A. Rigney , J. P. Hirth

Triboelectrochemical techniques and interpretation methods in tribocorrosion: A comparative evaluation

2007-12-26

S. Mischler

Quantification of fretting damage

1996-12-01

S. Fouvry , Philippe Kapsa , L.D. “Lou” Vincent

The role of oxidation in the wear of alloys

1998-01-01

F.H. Stott

Electrochemical methods in tribocorrosion: a critical appraisal

2001-08-01

D. Landolt , S. Mischler , M. Stemp

Transfer, mixing and associated chemical and mechanical processes during the sliding of ductile materials

2000-10-01

D.A. Rigney

Mechanics of fretting fatigue crack formation

1996-10-01

Matthew P. Szolwinski , T. N. Farris

Electrochemical techniques for studying tribocorrosion processes

2003-11-02

Pierre Ponthiaux , F. Wenger , Dirk Drees +1 more

The wear of metals under unlubricated conditions

1956-08-02

J. F. Archard , W. P. Hirst

The wear of a wide range of material combinations has been studied in unlubricated conditions. Loads of 50 g to 10 Kg and speeds of 2 to 660 cm/s have … The wear of a wide range of material combinations has been studied in unlubricated conditions. Loads of 50 g to 10 Kg and speeds of 2 to 660 cm/s have been used. A representative selection of the results is given. As a broad classification two contrasting mechanisms of wear have been observed. In nearly all experiments, and for all types of wear mechanism, once equilibrium surface conditions are established the wear rate is independent of the apparent area of contact. The wear rate is accurately proportional to the load for only a limited number of combinations but there are many other examples for which the relation between wear rate and load shows only a small deviation from direct proportionality. It is suggested that with the same surface conditions the wear rate is proportional to the load; in practice this simple relation is modified because the surface conditions depend on the load. These rules of wear may be derived, on a priori grounds, from the experimental results, or from more detailed theoretical calculations.

An overview of the delamination theory of wear

1977-08-01

Nam P. Suh

Sliding interfaces with contact-impact in large-scale Lagrangian computations

1985-09-01

J.O. Hallquist , G.L. Goudreau , David J. Benson

Finite element simulation and experimental validation of fretting wear

2003-11-02

I.R. McColl , Jian Ding , S.B. Leen

Comments on a Ruptured Soap Film

1960-06-01

F. E. C. Culick

First Page First Page

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Flow characteristics of highly constrained metal wires

1989-07-01

Michael F. Ashby , F.J. Blunt , Michael Bannister

The Contact Stresses Between a Rigid Indenter and a Viscoelastic Half-Space

1966-12-01

T. C. T. Ting

The Hertz problem for a rigid spherical indenter on a viscoelastic half-space was studied by Lee and Radok [1] in which the radius a(t) of the contact area is a … The Hertz problem for a rigid spherical indenter on a viscoelastic half-space was studied by Lee and Radok [1] in which the radius a(t) of the contact area is a monotonically increasing function of time t. Later, Hunter [2] studied the rebound of a rigid sphere on a viscoelastic half-space so that the contact radius a(t) increases monotonically to a maximum and then decreases to zero monotonically. The contact problem in which a(t) increases for the second time and decreases again does not seem to have been studied; nor has the contact problem in which a(t) is nonzero initially and decreases monotonically been studied. In this paper, a method is introduced so that the contact problem can be solved for arbitrary a(t). The rigid indenter is assumed to be smooth and axisymmetric but otherwise arbitrary. The viscoelastic solutions are expressed in terms of the associated elastic solutions. A means for measuring the viscoelastic Poisson’s ratio is suggested.

A solution method for planar and axisymmetric contact problems

1985-01-01

Klaus‐Jürgen Bathe , Anil Chaudhary

Abstract A solution procedure for the analysis of planar and axisymmetric‐contact‐ problems involving sticking, frictional sliding and separation under large deformations is presented. The contact conditions are imposed using the … Abstract A solution procedure for the analysis of planar and axisymmetric‐contact‐ problems involving sticking, frictional sliding and separation under large deformations is presented. The contact conditions are imposed using the total potential of the contact forces with the geometric compatibility conditions, which leads to contact system matrices and force vectors. Some key aspects of the procedure are the contact matrices, the use of distributed tractions on the contact segments for deciding whether a node is sticking, sliding or releasing and the evaluation of the nodal point contact forces. The solutions to various sample problems are presented to demonstrate the applicability of the algorithm.

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A perturbed Lagrangian formulation for the finite element solution of contact problems

1985-08-01

J.C. Simo , Peter Wriggers , Robert L. Taylor

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One Hundred Years of Hertz Contact

1982-06-01

K. L. Johnson

Wear-mechanism maps

1990-05-01

M. F. Ashby , S.C. Lim

Explicit Equations for the Stresses beneath a Sliding Spherical Contact

1983-01-01

G. M. Hamilton

Explicit formulae have been developed for the stresses beneath a sliding, normally loaded Hertzian contact. As friction rises a region of impending failure develops in the back edge of contact. Explicit formulae have been developed for the stresses beneath a sliding, normally loaded Hertzian contact. As friction rises a region of impending failure develops in the back edge of contact.

Mechanics of fretting fatigue

1994-06-01

D.A. Hills

An investigation of fatigue and fretting in a dovetail joint

1984-09-01

C. Ruiz , P. H. B. Boddington , K. C. Chen

The analysis of grain boundary diffusion measurements

1963-06-01

A.D. Le Claire

Whipple's exact solution of the grain boundary diffusion problem is evaluated numerically and the results presented in graphical form suitable for immediate application to the commoner types of experimental measurement … Whipple's exact solution of the grain boundary diffusion problem is evaluated numerically and the results presented in graphical form suitable for immediate application to the commoner types of experimental measurement of D́, the grain boundary diffusion coefficient. This enables a detailed comparison to be made between the results obtained using the exact solution and the approximate but commonly employed Fisher solution. The most interesting result is that indiscriminate use of the Fisher equation may lead to anomalously high activation energies for grain boundary diffusion, especially in low angle boundaries. The Whipple solution is also compared with another exact solution due to Suzuoka, which employs a different surface condition from the one assumed by Whipple. For the sectioning method of measurements the two solutions will give nearly the same value of D́. This is a distinct advantage for this method over others, for the conditions prevailing at the surface in a grain boundary experiment are not easily controllable.

Elastic surface—substrate interactions

1999-02-08

David J. Steigmann , Ray W. Ogden

A theory for three–dimensional finite deformations of elastic solids with conforming elastic films attached to their bounding surfaces is described. The Gurtin–Murdoch theory incorporating elastic resistance of the film to … A theory for three–dimensional finite deformations of elastic solids with conforming elastic films attached to their bounding surfaces is described. The Gurtin–Murdoch theory incorporating elastic resistance of the film to strain is generalized to account for the effects of intrinsic flexural resistance. This modification yields a model that can be used to describe equilibrium deformations in the presence of compressive–surface stress fields. An associated variational theory is given and material symmetry considerations are discussed. The theory is illustrated by examples.

Transition between mild and severe wear in aluminium alloys

1997-02-01

J. Zhang , A.T. Alpas

Tribofilm formation and mild wear by tribo-sintering of nanometer-sized oxide particles on rubbing steel surfaces

2006-05-05

Hirotaka Kato , K. Komai

Third-bodies in tribology

1990-02-01

Maurice Godet

High-temperature sliding wear of metals

2002-08-01

F.H. Stott

Different aspects of the role of wear debris in fretting wear

2002-07-01

Michael Varenberg , G. Halperin , I. Etsion

Simulating sliding wear with finite element method

1999-02-01

Priit Põdra , Sören Andersson

Single state elastoplastic friction models

2002-05-01

Pierre E. Dupont , Vincent Hayward , Brian Armstrong +1 more

For control applications involving small displacements and velocities, friction modeling and compensation can be very important. In particular, the modeling of presliding displacement (motion prior to fully developed slip) can … For control applications involving small displacements and velocities, friction modeling and compensation can be very important. In particular, the modeling of presliding displacement (motion prior to fully developed slip) can play a pivotal role. In this paper, it is shown that existing single-state friction models exhibit a nonphysical drift phenomenon which results from modeling presliding as a combination of elastic and plastic displacement. A new class of single state models is defined in which presliding is elastoplastic: under loading, frictional displacement is first purely elastic and then transitions to plastic. The new model class is demonstrated to substantially reduce drift while preserving the favorable properties of existing models (e.g., dissipativity) and to provide a comparable match to experimental data.

Compliance of Elastic Bodies in Contact

1949-09-01

R. D. Mindlin

Abstract A small tangential force and a small torsional couple are applied across the elliptic contact surface of a pair of elastic bodies which have been pressed together. If there … Abstract A small tangential force and a small torsional couple are applied across the elliptic contact surface of a pair of elastic bodies which have been pressed together. If there is no slip at the contact surface, considerations of symmetry and continuity lead to the conclusion that there is no change in the normal component of traction across the surface and, aside from warping of the surface, there is no relative displacement of points on the contact surface. The problem is thus reduced to a “problem of the plane” in which the tangential displacements and normal component of traction are given over part of the boundary and the three components of traction are given over the remainder. In the case of the tangential force it is observed that, when Poisson’s ratio is zero, the problem is a simple one, in potential theory, which is then generalized by means of a special device. An expression for tangential compliance is found as a linear combination of complete elliptic integrals. In general, the compliance is greater in the direction of the major axis of the elliptic contact surface than in the direction of the minor axis. Both components of tangential compliance increase as Poisson’s ratio decreases and become equal when Poisson’s ratio is zero. Over the practical range of Poisson’s ratio, the tangential compliance is greater than the normal compliance, but never more than twice as great as long as there is no slip. The tangential traction on the contact surface is everywhere parallel to the applied force. Contours of constant traction are ellipses homothetic with the elliptic boundary. The magnitude of the traction rises from one half the average at the center of the contact surface to infinity at the edge. Due to this infinity, there will be slip, the effect of which is studied for the circular contact surface. In the case of the torsional couple, the solution is obtained by generalizing a solution by H. Neuber pertaining to a hyperbolic groove in a twisted shaft. The torsional compliance is expressed in terms of complete elliptic integrals and, for the circular contact area, reduces to that found by E. Reissner and H. F. Sagoci. The resultant traction at a point rises from zero at the center to infinity at the edge of the contact surface, but is constant along and parallel to homothetic ellipses only in the case of the circular contact area.

Extruded Cables For High‐Voltage Direct‐Current Transmission

2013-06-12

Some basic problems of the mathematical theory of elasticity

1954-08-01

Rupen Eksergian

Bearing Pressures and Cracks: Bearing Pressures Through a Slightly Waved Surface or Through a Nearly Flat Part of a Cylinder, and Related Problems of Cracks

1939-06-01

Harald Westergaard

Abstract The task is undertaken of determining the bearing pressures, and the stresses and deformations created by them, in some cases that differ from those considered by Hertz in his … Abstract The task is undertaken of determining the bearing pressures, and the stresses and deformations created by them, in some cases that differ from those considered by Hertz in his classical study of contact. Thus two solids are examined which, before loading, are in contact along a row of evenly spaced lines in a horizontal plane, as indicated in Fig. 1(a). Between these lines the surfaces have a separation defined by a nearly flat cosine wave. A uniform pressure on top of the upper solid creates contact over an area consisting of a row of strips, reduces the separation of the solids between the strips, as suggested in Fig. 1(b), and creates contact pressures distributed as indicated in Fig. 1(c), with vertical rises in the diagram of pressure at the edges of the strips. At a greater load the width of the strip becomes equal to the wave length, and the contact is complete. At still greater loads the stresses increase as if the two solids were one. The procedure by which this problem is solved is demonstrated first by showing its easy application to some well-known cases, especially Hertz’s problem of circular cylinders in contact. Further applications are to a noncircular cylinder resting on a solid with a flat top, with an initial separation of the surfaces varying as the fourth power of the distance from the initial line of contact; to partial contact of two surfaces which are initially plane, except that one of them has a ridge or several parallel ridges; and to some related problems in which two parts of the same body are partially separated by the forming of one or more cracks.

Stresses Due to Tangential and Normal Loads on an Elastic Solid With Application to Some Contact Stress Problems

1953-06-01

J. O. Smith , Chang Keng Liu

Abstract The results of two-dimensional approach using real variable method to Hertz’s problem of contact of elastic bodies are presented. Both normal and tangential loads are assumed to be distributed … Abstract The results of two-dimensional approach using real variable method to Hertz’s problem of contact of elastic bodies are presented. Both normal and tangential loads are assumed to be distributed in Hertzian fashion over the area of contact. The magnitude of the intensity of the tangential load is assumed to be linearly proportional to that of the normal load when sliding motion of the body is impending. The stresses in the elastic body due to the application of these loads on its boundary are presented in closed form for both plane-stress and plane-strain cases. A numerical value of f = 1/3 is assumed for the linear proportionality (coefficient of friction) between the tangential and normal loads in order that the distribution of stresses may be illustrated. The significance of the stress distribution, across the contact area and in the body, is also discussed. It is shown that when the combination of loads considered in the paper are applied at the contact area of bodies in contact the maximum shearing stress may be at the surface instead of beneath the surface. For example, for plane strain, if the coefficient of friction is f = 1/3, the maximum shearing stress is at the surface and is 43 per cent larger than the maximum shearing stress, which would be below the surface, that occurs when the normal force acts alone. The effect of range of normal stress and of shearing stress on the plane of maximum shear and on the plane of maximum octahedral shear on failure by progressive fracture (fatigue) is discussed.

The delamination theory of wear

1973-07-01

Nam P. Suh

Observing non-linear stress response around interference fit fasteners

2025-06-25

Jordan Carroll , Leigh Robertson , Akbar Afaghi Khatibi +1 more | Journal of Engineering Materials and Technology

Abstract Interference fasteners are standard tools in aircraft structures used to enhance fatigue resistance. When properly installed, these fasteners reduce the stress concentration caused by the hole. Their presence reduces … Abstract Interference fasteners are standard tools in aircraft structures used to enhance fatigue resistance. When properly installed, these fasteners reduce the stress concentration caused by the hole. Their presence reduces the alternating stress component – the primary driver of fatigue – and therefore increases fatigue life. However, the stress fields around the fasteners are complex, with residual stresses caused by yielding and fastener misfit. In this study, the deformation around interference fit fasteners caused by insertion and subsequent loading is investigated using digital image correlation of representative coupons. This reveals the non-linear stress response around the fastener itself, and the effects of the loading sequence on the material around the hole. These observations show that analysing interference fastener joints without accounting for the variation in stress concentration may result in less conservative results and therefore stress the importance of understanding the complex stress state around these fasteners.

Research on the braking and sealing performance of rubber cylinder in the new type of two-cylinder anchor sealing mechanism of intelligent pipeline sealing robot

2025-06-24

Yang Tang , Minghai Zhou , Guorong Wang +2 more | Ocean Engineering

Improving Wear Resistance of Pipes via Double Centrifugal Casting

2025-06-24

Kyu-Jo Lee , Gab-Soon Kim | Journal of the Korean Society of Manufacturing Process Engineers

Numerical investigation of contact behavior for elastoplastic hemisphere considering yield plateau and strain hardening under cyclic tangential loading

2025-06-23

Juncheng Luo , Fuli Zhang , Jianhua Liu +2 more | Meccanica

Data-driven numerical simulation and evaluation methods for mechanical properties of corroded high-strength steel wire for bridge cable structure

2025-06-20

Zhijie Yuan , Hao Wang , Lingxiao Wang +3 more | Anti-Corrosion Methods and Materials

Purpose Cables composed of parallel steel wires are easily subject to environmental corrosion, which leads to a decrease in the bearing capacity and seriously affects the safe operation. This paper … Purpose Cables composed of parallel steel wires are easily subject to environmental corrosion, which leads to a decrease in the bearing capacity and seriously affects the safe operation. This paper aims to propose a data-driven numerical method and evaluation framework for the mechanical properties of corroded cable structures. Design/methodology/approach Based on the stress-corrosion test data, a data-driven prediction method for the corrosion characteristic parameters of high-strength steel wire was proposed. According to the prediction results of corrosion morphology parameters, an ABAQUS plug-in was developed to form random corrosion pits on the surface of steel wire, and then a numerical simulation method for corroded steel wire was proposed. Combined with the monitoring data, a mechanical properties evaluation method for the corroded cable structure was constructed with corrosion time and stress level as input values. Findings The accuracy of the proposed method was verified by comparing the calculated results with the experiment. The gradient boosting decision tree model is the best for predicting the mechanical properties of corroded cables. The mechanical properties of steel wires decrease with increasing corrosion level. The proposed framework can accurately calculate the performance degradation of cable structures at different service stages. Originality/value The proposed method does not require a large number of expensive tests. Through numerical calculations combined with monitoring data, the mechanical properties of the steel wire inside the cable can be evaluated. The conclusion can provide a reference for performance assessment and maintenance decision-making of bridge structures.

Optimisation and Analysis of Microswitch Mechanical Structure

2025-06-20

Xiang Li , Qishun Wang , Rui Xu +2 more | Academic Journal of Science and Technology

The text discusses the failure issues of the YBLXW-5 series micro switch concerning mechanical, electrical, and heating aspects, thoroughly investigating the contact bounce phenomenon and its structural optimization methods. By … The text discusses the failure issues of the YBLXW-5 series micro switch concerning mechanical, electrical, and heating aspects, thoroughly investigating the contact bounce phenomenon and its structural optimization methods. By establishing statics and dynamics models, the dynamic characteristics of bounce were analyzed, and finite element simulation along with genetic algorithms was used to optimize structural parameters. The research results indicate that the optimized micro switch's bounce time decreased by 32.04%, and the maximum bounce amplitude reduced by 55.97%, significantly enhancing dynamic performance and contact reliability. This study provides a theoretical basis and practical guidance for the structural optimization and performance improvement of micro switches, which is of great significance for their stability, reliability, and safety in actual applications, while also promoting the development and application of micro switch technology.

Modeling of contact interaction and wear of the trolleybus contact insert-wire tribopair

2025-06-18

Kostyantyn Holenko , Ігор Ковтун , Aleksandr Dykha | PROBLEMS OF TRIBOLOGY

The article presents the results of numerical modeling of the contact interaction of the tribopair "contact insert - contact wire" of a trolleybus using the Ansys software environment. The main … The article presents the results of numerical modeling of the contact interaction of the tribopair "contact insert - contact wire" of a trolleybus using the Ansys software environment. The main attention is paid to the analysis of the stress state and the prediction of wear of friction surfaces when modeling a stable frictional contact. Based on the constructed solid-state models of the contact insert and the MF-100 copper wire, a finite element mesh was formed and real conditions of operational loading were simulated. The distributions of contact pressure, frictional and equivalent stresses, as well as the nature of the contact spot were determined. Linear wear was calculated using the energy criterion, taking into account local frictional stresses and material hardness. The obtained results were compared with the available experimental data, which confirms the adequacy of the proposed model. The article also outlines the prospects for interpolation of short-term simulations into long-term operating modes by mathematical modeling of wear under variable load. The material is useful for predicting the service life of current collection devices and optimizing their geometry and materials

A New Investigation Of Plastic Limit of Repaired Steel Pipe Elbow With Bonded Composite Wrap Subjected to Internal Pressure

2025-06-17

Belaïd Mechab , Ali Benouar , Bachir Bouiadjra Bel Abbes +2 more | Journal of Pressure Vessel Technology

Abstract The present work provides a thorough examination of the J-integral and plastic limit load for a circumferential through-wall fracture in an elbow reinforced with a bonded composite wrap under … Abstract The present work provides a thorough examination of the J-integral and plastic limit load for a circumferential through-wall fracture in an elbow reinforced with a bonded composite wrap under internal pressure. A three-dimensional finite element (FE) method is employed to evaluate the ductility of the structure and predict its failure behaviour under varying conditions. The analysis investigates the influence of geometrical and pipe materials . The results are compared against existing analytical solutions in the literature, which are derived from detailed 3D FE limit analysis and are considered to provide reliable benchmarks. These solutions contribute valuable insights for the plastic analysis of pressurised pipes and the estimation of non-linear fracture mechanics parameters using the reference stress method. To quantify the variability in the pressure limit, a probabilistic approach is employed using the Monte Carlo method. Structural failure probability is assessed by accounting for both model uncertainty and statistical variability in the input data. Three probability distribution functions—the ninth-order polynomial, the Lorentzian, and the Gaussian?are examined to characterize the uncertainty. Among these, the Gaussian distribution proves to be the most suitable for approximating the probability density function, offering a reliable estimate of the mean pressure limit. The study highlights that uncertainty in the pressure limit parameter significantly affects failure probability and contributes to a reduction in the overall structural lifespan. These findings provide essential guidance for the design and reliability assessment of composite-reinforced pressurized piping systems.

Dynamic Power Cable Layout Design for 15MW Floating Offshore Wind Turbines: Part 1 - Configuration Analysis and Optimization

2025-06-17

Dohyoung Kwon , Hyun Kyung Kim , Joonmo Choung | Journal of Ocean Engineering and Technology

A Novel Asymmetric Cascaded H‐Bridge Concept Using Switched Rectifier

2025-06-16

Hasan Hataş | International Journal of Circuit Theory and Applications

ABSTRACT In this paper, a new concept is proposed for classical cascaded H‐bridge (CHB) multilevel inverter (MLI) configurations. The proposed structure includes a DC‐DC converter circuit (switching rectifier) that generates … ABSTRACT In this paper, a new concept is proposed for classical cascaded H‐bridge (CHB) multilevel inverter (MLI) configurations. The proposed structure includes a DC‐DC converter circuit (switching rectifier) that generates multiple asymmetric voltages at the input of the H‐bridges. This SR circuit can generate different voltages (1 V DC and 2 V DC ) at the same terminals, thus providing a compact solution to existing topologies. Multiple DC bus voltages are generated using HFL and SR, resulting in higher levels at the output compared to traditional asymmetric source configurations. Three H‐bridge circuits that generate a 27‐level in trinary configuration and a 15‐level in binary configuration are combined with two SRs to produce a 35‐level output. With an output efficiency of over 96%, the topology offers low power losses and sustainable performance, making it an energy‐efficient and cost‐effective alternative. The high output level and stable performance characteristics make this hybrid CHB structure suitable for renewable energy systems, electric vehicles, and general power electronics applications. A comprehensive comparison with other MLI designs in the literature is made, and the simulation results are validated with a low‐power prototype.

Application of machine learning methods incorporating Archard model for wear prediction of submarine cables

2025-06-16

Qingzhen Lu , Xinlei Chen , Yuanchao Yin +3 more | Ocean Engineering

Effects of relative displacement and slip condition on fretting behavior of Ti-6Al-4V: experimental and numerical analysis

2025-06-16

A. Mazouzi , Mohammed Cheikh , Hamdi Laouici | Tribology Transactions

Investigation of fretting fatigue under constant amplitude using a damage model based on dissipated energy

2025-06-16

Mohammad Keshtgar , Mahmoud Shariati , Khalil Farhangdoost +1 more | Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science

This study introduces an energy-based damage model for the initiation of fretting fatigue cracks, using dissipated energy per cycle as a damage indicator. Employing the UMAT subroutine, fretting fatigue life … This study introduces an energy-based damage model for the initiation of fretting fatigue cracks, using dissipated energy per cycle as a damage indicator. Employing the UMAT subroutine, fretting fatigue life estimation and crack initiation location are conducted using the damage model based on dissipated energy, which considers the effects of all stress and strain components. In addition, Effects of loading history and sequence are introduced in the damage model using <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>n</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>i</mml:mi> <mml:mo>−</mml:mo> <mml:mn>1</mml:mn> <mml:mo>,</mml:mo> <mml:mi>e</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> parameter. The effect of bulk stress and normal force amplitudes on fretting fatigue life, stick zone width, and crack location is investigated. Results show that variations in normal force and maximum axial stress alone do not significantly affect fretting fatigue life. Despite higher normal force, bulk stress, and maximum axial stress, some cases demonstrate unexpectedly higher fretting fatigue life due to the multiaxial nature of fretting fatigue. However, fretting fatigue life decreases as dissipated energy per cycle increases, so that, a 60% increase in dissipated energy per cycle leads to a 23% decrease in fretting fatigue life, while the bulk stress ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:mrow> <mml:msub> <mml:mrow> <mml:mi>σ</mml:mi> </mml:mrow> <mml:mrow> <mml:mn>0</mml:mn> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> ), maximum axial stress <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"> <mml:mrow> <mml:mo stretchy="false">(</mml:mo> <mml:msub> <mml:mrow> <mml:mi>σ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi>xx</mml:mi> </mml:mrow> </mml:msub> <mml:msub> <mml:mrow> <mml:mo stretchy="false">)</mml:mo> </mml:mrow> <mml:mrow> <mml:mi>max</mml:mi> </mml:mrow> </mml:msub> </mml:mrow> </mml:math> increases by approximately 5% and 9.5%, respectively. Reducing the normal force increases fretting fatigue life while shifting the crack initiation location away from the center of the contact surface. Specifically, a 19% reduction in normal force leads to a 0.16% increase in fretting fatigue life, while a 28% reduction results in a 3% increase. Further analysis reveals that changes in bulk stress and normal force modify the width of the stick zone and the distribution of shear stress, impacting fatigue life. Additionally, as fretting fatigue life progresses, the critical damage location remains constant, although the damage value increases.

Closed form linear membrane solution for metal-FRP toroidal pressure vessels

2025-06-14

Mohan Krishna Paleti , Suriya Prakash S , V. Narayanamurthy | Mechanics Based Design of Structures and Machines

Expected strength of RBS moment connections

2025-06-14

Jonathan T. Tshibanda , Paul W. Richards | Journal of Constructional Steel Research

Effects of Extruder Dynamics and Noise on Simulated Chromatin Contact Probability Curves

2025-06-12

В.Ф. Константинов , Shadskiy Artem , Timofey Lagunov | bioRxiv (Cold Spring Harbor Laboratory)

Abstract Loop extrusion by SMC complexes is a key mechanism underlying chromatin folding during both interphase and mitosis. Despite this shared mechanism, computational models of loop extrusion often rely on … Abstract Loop extrusion by SMC complexes is a key mechanism underlying chromatin folding during both interphase and mitosis. Despite this shared mechanism, computational models of loop extrusion often rely on fundamentally different assumptions: interphase models typically use dynamic extruders with finite lifetimes, while mitotic models employ static extruders placed according to loop size distributions. In this work, we investigate whether these modeling paradigms are interchangeable or yield intrinsically incompatible results. Using publicly available Hi-C data from mitotic chicken cells, we systematically compare dynamic and static loop extrusion models implemented in the Polychrom framework. We evaluate how key parameters—such as extruder lifetime, extrusion velocity, and spatial noise—affect simulated contact probability curves P(s) and loop size distributions. Our results reveal that while both model types can be tuned to approximate the general shape of P(s), they produce distinct internal structures and divergent relationships between loop size and contact decay. We also show that increased extruder lifetimes lead to excessive nested loop formation, which alters both loop statistics and P(s) derivatives. Introducing spatial exclusion constraints between extruders partially restores consistency with static models. These findings highlight that differences in extruder behavior and polymer noise levels can significantly impact chromatin model outcomes and must be carefully accounted for when interpreting or comparing simulation results across biological conditions. Author summary Chromatin organization plays a crucial role in gene regulation and cellular function, yet our understanding of its three-dimensional structure relies heavily on computational modeling and the interpretation of complex experimental data. In this study, we use coarse-grained modeling approaches to simulate chromatin folding and systematically investigate how different analysis metrics and data processing methods influence the conclusions drawn from such models. By comparing widely used metrics and exploring the effects of normalization and noise, we highlight potential pitfalls and biases that can arise in chromatin modeling studies. Our findings provide practical recommendations for researchers in the field, aiming to improve the robustness and reproducibility of computational analyses of chromatin architecture. This work will help guide future studies toward more reliable interpretations of chromatin structure and its biological implications.

Evaluating the effectiveness of interference fit connections in automotive transmission component design

2025-06-12

K.C. Ganesh , Karthikeyan Velmurugan , M. Satya Sai Ram +2 more | Mechanics Based Design of Structures and Machines

Fretting corrosion behaviour of 316L stainless steel before and after plasma carburization in different corrosive-lubricating solutions

2025-06-11

Lu Sun , Yuandong Li , Chi Cao +3 more | Materials Science and Technology

The fretting corrosion characteristics of 316L and the plasma carburized layer (PCL) in various corrosive-lubricating solutions were investigated. In neutral solution and distilled water, both 316L and PCL exhibited fatigue … The fretting corrosion characteristics of 316L and the plasma carburized layer (PCL) in various corrosive-lubricating solutions were investigated. In neutral solution and distilled water, both 316L and PCL exhibited fatigue peeling and adhesive wear, with material loss primarily driven by mechanical action and minimal corrosion-wear interaction. Exposure to seawater and acid rain resulted in adhesive wear, corrosive wear, and fatigue peeling for 316L. PCL showed adhesive wear and corrosive wear. The material loss resulted from both mechanical action and corrosive-wear interaction. Reactive ions exacerbated the corrosive-wear interaction, increased wear amount, and reduced friction coefficient. The frictional energy dissipation coefficient, wear rate, and depth of PCL were relatively low. PCL improved the corrosion-wear resistance and stability of 316L, offering effective protection.

Fretting Wear Behavior of PVA-Based Hydrogels Under Dry Friction

2025-06-03

Fei Xu , Liao-Liang Ke , Jie Su | Tribology Letters

A novel approach for modeling wear at macro length and time scales in discrete element systems

2025-06-01

Muhammad Sameer , C. Fred Higgs | Tribology International

Synergic effect of grease and zinc coating against fretting fatigue damages in a crossed steel wire contact: application to offshore wind mooring ropes

2025-06-01

S. Montalvo , S. Fouvry , Mariana Martinez | Engineering Failure Analysis

Clip fracture mechanism in double-non-vibration fastener section and external excitation-internal characteristic control method

2025-06-01

Jiuyu Wan , Xiaolu Cui , Guobao Xu +7 more | Engineering Failure Analysis

Static performance of corroded weathering steel composite bridge studs considering interface friction

2025-05-31

Han Su , Zhenkun Huang , Sen Liu +2 more | Structures

Model tests of a stiffness-similar jack-up, Part 1: Model design, fabrication and structural pre-tests

2025-05-31

Miaomiao Cai , Shanli Zhang , Chi Zhang +7 more | Marine Structures

CONTROLLED GANZ DISLOCATION

2025-05-31

Carlos Á. Iglesias , Bryam Esteban Coello García , Jennifer Paulette Pineda Valarezo | EPRA International Journal of Multidisciplinary Research (IJMR)

Introduction: femoral head fractures are rare and typically result from high-energy trauma, such as traffic accidents, often requiring hospital care. Traditional surgical approaches like Kocher-Langenbeck and Smith-Petersen have limitations. The … Introduction: femoral head fractures are rare and typically result from high-energy trauma, such as traffic accidents, often requiring hospital care. Traditional surgical approaches like Kocher-Langenbeck and Smith-Petersen have limitations. The Ganz controlled dislocation technique, introduced in the 1990s, allows full visualization of the femoral head with minimal risk to its blood supply, facilitating direct reduction and fixation. However, there is limited literature evaluating its outcomes in femoral head fractures. Objective: to detail current information related to Ganz controlled dislocation. Methodology: a total of 22 articles were analyzed in this review, including review and original articles, as well as cases and clinical trials, of which 12 bibliographies were used because the information collected was not sufficiently important to be included in this study. The sources of information were Cochrane, PubMed and Google Scholar; the terms used to search for information in Spanish, Portuguese and English were: femoral head fractures, hip dislocation, Ganz controlled dislocation, hip anatomy. Results: conventional surgical approaches have limited visualization and carry higher risks of complications. The Ganz controlled dislocation technique offers enhanced exposure of the femoral head while preserving its vital blood supply, significantly reducing the risk of osteonecrosis. This method allows precise reduction and stable fixation of fracture fragments, leading to improved functional outcomes and fewer complications when performed with meticulous anatomical and technical care. Conclusions: femoral head fractures are rare and complex injuries that require careful surgical management. The Ganz controlled dislocation technique provides improved visualization and preserves blood supply, reducing complications like osteonecrosis. Although evidence is limited, this approach offers better functional outcomes and fewer complications compared to traditional methods, representing a significant advancement in surgical treatment. Keywords: Dislocation, Ganz, Femur, Fracture.

Bearing Ring Creep: Wear Prediction and Remedy in an EV Power Transmission System

2025-05-30

Xiaobo Zhou , Cao Li-jun , Victor Brizmer +6 more | Tribology online