Contact Mechanics Modeling Of Homogeneous And Layered Elastic Plastic Media

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Contact Mechanics Modeling of Homogeneous and Layered Elastic-Plastic Media

Author : Zhichao Song
Publisher :
ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.:/5 (839 download)

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Book Synopsis Contact Mechanics Modeling of Homogeneous and Layered Elastic-Plastic Media by : Zhichao Song

Download or read book Contact Mechanics Modeling of Homogeneous and Layered Elastic-Plastic Media written by Zhichao Song and published by . This book was released on 2012 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this dissertation was to analyze surface contact interaction at different length scales and to elucidate the effects of material properties (e.g., adhesion and mechanical properties), normal and shear (friction) surface tractions, and topography parameters (e.g., roughness) on contact deformation. To accomplish this objective, a surface adhesion model based on an interatomic potential was incorporated into finite element contact models of rough surfaces exhibiting multi-scale roughness described by statistical and fractal geometry models. The problem of a rigid sphere in contact with an elastic-plastic half-space was first examined in the light of finite element simulations. Four post-yield deformation regimes were identified and the boundaries of neighboring regimes were obtained by curve-fitting of finite element results. Material hardness was shown to significantly deviate from the similarity solution with decreasing elastic modulus-to-yield strength ratio and the logarithmic dependence of the mean contact pressure on the indentation depth was found to hold only when the plastic zone was completely surrounded by elastic material. Constitutive equations were first derived for elastic-perfectly plastic half-spaces from curve-fitting finite element results and were then extended to isotropic, power-law hardening half-spaces, using the concept of the effective strain, which correlates the indentation depth with the indenter size. Finite element simulations of unloading process and repetitive normal contact were used to correlate the residual indentation depth and the dissipated plastic energy with the maximum indentation depth. Elastic shakedown, plastic shakedown, and ratcheting were identified by tracking the accumulation of plasticity for different values of maximum contact load and elastic modulus-to-yield strength ratio. The semi-infinite half-space was characterized by three different regions, named ratcheting region, shakedown region and elastic region, as the distance to contact surface increases. The obtained results have direct implication in material property measurements obtained with indentation method, particularly for materials exhibiting strain hardening behavior, and provide insight into the accumulation of plasticity due to repetitive contact loading, which is important in the understanding of the contact fatigue life of contact-mode devices. Sliding contact between a rigid fractal surface exhibiting multi-scale roughness and an elastic-plastic half-space was examined to elucidate rough-surface deformation due to small-amplitude reciprocating sliding (fretting). Stick-slip at the asperity scale was analyzed based on Mindlin's theory and a friction model that accounts for both adhesion and plowing effects. Numerical results yield insight into the effects of surface roughness, contact pressure, oscillation amplitude, elastic modulus-to-yield strength ratio, and interfacial adhesion on the friction force, slip index, and energy dissipation. The results of this study illustrate the important role of the contact load and surface topography on the energy dissipation and fretting wear of small-amplitude oscillatory contacts. Surface adhesion modeled as surface traction obeying the Lennard-Jones (LJ) potential was incorporated into the contact analysis of a rigid sphere indenting an elastic half-space to study contact instabilities associated with instantaneous surface contact (jump-in) and detachment (jump-out). This surface traction was introduced into a finite element contact model in the form of nonlinear spring elements and the jump-in/jump-out condition obtained analytically was confirmed by finite element results. Then, adhesive contact between a rigid sphere and an elastic-plastic half-space was analyzed and the effect of plasticity on the pull-off force and the commencement of contact instabilities was interpreted in terms of a modified Tabor parameter. The developed finite element model with nonlinear spring elements representing adhesive surface interaction provides a physics-based, computationally-efficient technique for studying adhesive contacts. The obtained results provide explanation for the contact instabilities encountered during surface probing with microprobe tips and stiction (permanent adhesion) in contact-mode microdevices. Adhesive contact between a rigid sphere and a layered medium analyzed with the finite element method shed light into adhesion-induced contact deformation. Two modes of surface detachment were observed for perfect bonding of the film to the substrate - brittle- and ductile-like surface detachment. Simulation results illustrate the effects of the maximum surface separation, film thickness, film-to-substrate elastic property mismatch, and substrate yield strength on the mode of surface detachment and residual deformation. Introducing a cohesive model that allows for crack formation and growth along the film/substrate interface in the previous finite element model, a residual cohesive zone was found at the crack tip after complete unloading. Contact instabilities and interface delamination were interpreted by the competing effects of surface adhesion and interfacial cohesion. Crack closure and crack-tip opening displacement (CTOD) were studied by performing a parametric study of the cohesive strength, interfacial energy, surface energy, surface adhesive strength, substrate yield strength, and initial defect size. The obtained results can be used to explain thin-film failure in contact systems due to the effect of adhesion and to improve the endurance of thin-film media subjected to surface tractions. Adhesive contact of two elastic rough surfaces was analyzed by integrating asperity-scale constitutive equations into the model of Greenwood and Williamson (1966) to account for the effect of contact instabilities at asperity level on the macroscopic contact response. The strength of adhesion was found to be mostly affected by the Tabor parameter and the surface roughness. The widely used adhesion parameter of Fuller and Tabor (1977) was shown to be appropriate only for contact systems characterized by a high Tabor parameter. Therefore, a new adhesion parameter that governs the strength of adhesion of contact systems with a low Tabor parameter was introduced. Finally, a generalized adhesion parameter was derived by using the concept of the effective interatomic separation, defined as the ratio of the elastic stretch due to adhesion and the equilibrium interatomic distance. The research carried out in this dissertation provides fundamental understanding of the evolution of the stress and strain fields in contacting surfaces, the evolution of plasticity in indentation, the development of friction and dissipation of energy in fretting contacts, the occurrence of adhesion-induced contact instabilities and interfacial delamination, and the factors affecting the strength of adhesion for rough surfaces in normal contact. The results of this thesis have direct implications in various technologies, including high-efficiency gas turbines, magnetic storage devices, and microelectromechanical systems.

Contact Mechanics of Elastic-plastic Layered Media with Smooth and Rough Surfaces

Author : Ning Yeh
Publisher :
ISBN 13 :
Total Pages : 380 pages
Book Rating : 4.:/5 (34 download)

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Book Synopsis Contact Mechanics of Elastic-plastic Layered Media with Smooth and Rough Surfaces by : Ning Yeh

Download or read book Contact Mechanics of Elastic-plastic Layered Media with Smooth and Rough Surfaces written by Ning Yeh and published by . This book was released on 2002 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Nanoscale Surface and Interface Mechanics of Elastic-Plastic Media with Smooth, Patterned, and Rough Surfaces

Author : Yin, Xi
Publisher :
ISBN 13 :
Total Pages : 398 pages
Book Rating : 4.:/5 (858 download)

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Book Synopsis Nanoscale Surface and Interface Mechanics of Elastic-Plastic Media with Smooth, Patterned, and Rough Surfaces by : Yin, Xi

Download or read book Nanoscale Surface and Interface Mechanics of Elastic-Plastic Media with Smooth, Patterned, and Rough Surfaces written by Yin, Xi and published by . This book was released on 2011 with total page 398 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objective of this dissertation was to develop both finite element and analytical models of contact, friction, and wear phenomena encountered at the nanoscale. This was achieved by the development of continuum mechanics and discrete dislocation models of the deforming homogeneous or layered media and the use of self-affine (fractal) geometry for the representation of the interface topography. The specific accomplishments of this work are as follows. The contact problem of a rigid flat indenting an elastic-plastic semi-infinite medium with a sinusoidal surface profile was examined in light of a two-dimensional plane-strain finite element analysis. Numerical results of the dimensionless contact pressure, normal approach, average surface rise, center-line-average roughness, peak-to-valley roughness, cavity volume, and ratio of truncated-to-real contact area versus fractional contact area obtained for relatively compliant and stiff elastic-perfectly plastic half-spaces were compared with results obtained from a slip-line plasticity analysis. These results have direct application to metal working processes, such as rolling, and provide insight into the evolution of surface and subsurface contact deformation and asperity interaction of contacting surfaces exhibiting periodic waviness. Mechanical failure of patterned alternating phase-shift mask (APSM) nanostructures due to dynamic pressure loadings caused by megasonic cleaning was examined in the context of simulation results obtained from a two-dimensional plane-strain finite element analysis. A parametric study of the effects of microstructure geometry and loading frequency on the subsurface stress state and mask structural integrity was performed for two typical chromium-quartz APSM patterns. Numerical results elucidate possible failure modes and effect of microstructure dimensions on pattern damage during megasonic cleaning, and have direct implications to the design of extreme ultraviolet lithography masks and optimization of the megasonic cleaning process. Analytical models were developed to study the friction, wear, energy dissipation, and plastic flow of surfaces exhibiting multi-scale roughness in both sliding and normal contacts. A contact mechanics study of friction, energy dissipation, and abrasive wear of a hard and rough (fractal) surface sliding against a soft and smooth substrate was developed based on the slip-line theory of plasticity. The slip-line model yields relationships of the deformation behavior and coefficient of friction of a fully plastic asperity microcontact in terms of the applied normal load and interfacial adhesion. The analysis of the rough surface contact provides insight into the dependence of global friction coefficient, energy dissipated during sliding contact, and abrasive wear rate and wear coefficient on the global interference (total normal load effect), interfacial friction conditions (adhesion effect), fractal parameters (roughness effect), and elastic-plastic material properties (deformation mode effect). Numerical results for representative contact systems illustrate the effects of interfacial adhesion, global interference (total normal load), topography parameters, and material properties on friction coefficient, dissipated frictional energy, and wear rate/coefficient. The dependence of plastic deformation at asperity contacts and wear rate (coefficient) on global interference (total normal load), elastic-plastic material properties, topography (roughness), and work of adhesion of contacting surfaces was examined in a contact mechanics analysis of adhesive wear of rough (fractal) surfaces in normal contact. Loss of materials (wear) was presumed to originate from plastic contacting asperities, accounting for the contribution of interfacial adhesion to the normal load at each asperity microcontact. The effects of material properties, roughness, surface compatibility, and environmental conditions on the adhesive wear rate and wear coefficient were discussed in the context of numerical results for representative contact systems. Plane-strain indentation of a single-crystal semi-infinite medium by a rigid indenter was analyzed by discrete dislocation plasticity. The profile of the rigid indenter was characterized by either a smooth (cylindrical) or a rough (fractal) surface. This is the first contact analysis based on discrete dislocations derived for crystalline materials indented by a surface exhibiting multi-scale roughness. Short-range dislocation interactions were modeled in accord to dislocation constitutive rules, while long-range dislocation interactions were modeled by the elastic stress fields of edge dislocations. Simulation results provided insight into the effects of contact load, dislocation source and obstacle densities, slip-plane orientation and distribution, indenter radius, topography (roughness) of fractal surface, and multi-scale asperity interactions on damage at the onset of yielding (emission of first dislocation dipole) and plasticity evolution represented by the development of dislocation structures. Plastic deformation under the theoretical strength of the material was related to contact size effects. The findings in this dissertation provide fundamental understanding of surface deformation behavior, evolution of subsurface stress field due to contact traction, and tribological characteristics of elastic-plastic media with patterned and rough surface profiles subject to contact and/or surface loadings. The obtained results have direct implications in various industry fields, such as metal working, semiconductor electronics packaging, magnetic storage recording, and microelectromechanical devices.

Rough Surfaces

Author : T. R. Thomas
Publisher : World Scientific Publishing Company
ISBN 13 : 9781860941009
Total Pages : 278 pages
Book Rating : 4.9/5 (41 download)

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Book Synopsis Rough Surfaces by : T. R. Thomas

Download or read book Rough Surfaces written by T. R. Thomas and published by World Scientific Publishing Company. This book was released on 1999 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text addreseses the topic of surface roughness, how to measure and describe it, and what practical problems it might cause. Updated to include advances in measurement and characterization, this second edition introduces modern instruments, including laser interferometers and AFMs, and there are sections on fractals and motif analysis. Problems of 3D surface measurement and description are extensively treated. Manufacturing and production engineers, optical and QC engineers, tribologists and many other applied scientists should find this book useful.

Dynamic Contact and Friction Study of Homogeneous and Layered Media

Author : Jian Yang
Publisher :
ISBN 13 :
Total Pages : 392 pages
Book Rating : 4.:/5 (35 download)

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Book Synopsis Dynamic Contact and Friction Study of Homogeneous and Layered Media by : Jian Yang

Download or read book Dynamic Contact and Friction Study of Homogeneous and Layered Media written by Jian Yang and published by . This book was released on 2004 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Handbook of Contact Mechanics

Author : Valentin L. Popov
Publisher : Springer
ISBN 13 : 3662587092
Total Pages : 357 pages
Book Rating : 4.6/5 (625 download)

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Book Synopsis Handbook of Contact Mechanics by : Valentin L. Popov

Download or read book Handbook of Contact Mechanics written by Valentin L. Popov and published by Springer. This book was released on 2019-04-26 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: This open access book contains a structured collection of the complete solutions of all essential axisymmetric contact problems. Based on a systematic distinction regarding the type of contact, the regime of friction and the contact geometry, a multitude of technically relevant contact problems from mechanical engineering, the automotive industry and medical engineering are discussed. In addition to contact problems between isotropic elastic and viscoelastic media, contact problems between transversal-isotropic elastic materials and functionally graded materials are addressed, too. The optimization of the latter is a focus of current research especially in the fields of actuator technology and biomechanics. The book takes into account adhesive effects which allow access to contact-mechanical questions about micro- and nano-electromechanical systems. Solutions of the contact problems include both the relationships between the macroscopic force, displacement and contact length, as well as the stress and displacement fields at the surface and, if appropriate, within the half-space medium. Solutions are always obtained with the simplest available method - usually with the method of dimensionality reduction (MDR) or approaches which use the solution of the non-adhesive normal contact problem to solve the respective contact problem.

Asperity-scale Surface Mechanics - Implications to Adhesive Contacts and Microscale Deformation Behavior of Rough Surfaces

Author : Huaming Xu
Publisher :
ISBN 13 :
Total Pages : 416 pages
Book Rating : 4.:/5 (839 download)

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Book Synopsis Asperity-scale Surface Mechanics - Implications to Adhesive Contacts and Microscale Deformation Behavior of Rough Surfaces by : Huaming Xu

Download or read book Asperity-scale Surface Mechanics - Implications to Adhesive Contacts and Microscale Deformation Behavior of Rough Surfaces written by Huaming Xu and published by . This book was released on 2012 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: The principal objective of this dissertation was to develop numerical and analytical mechanics models accounting for nano-/micro-scale solid surface interaction. This was accomplished by developing finite element models of an asperity in adhesive sliding contact with a homogenous half-space and asperity micro-fracture due to normal and sliding contact of homogenous or layered half-spaces, and analytical models of nanoscale surface polishing and nanoparticle embedment on rough surfaces using a probabilistic approach. Adhesive interaction of a rigid asperity moving over a homogeneous elastic-plastic half-space was modeled by nonlinear springs obeying a constitutive law derived from the Lennard-Jones potential. The evolution of the normal and friction forces, subsurface stresses, and plastic deformation at steady-state sliding was examined in terms of the work of adhesion, interaction distance (interfacial gap), Maugis parameter, and plasticity parameter, using the finite element method (FEM). The deformation behavior of homogeneous elastic-perfectly plastic (EPP) and elastic-linear kinematic hardening plastic (ELKP) half-spaces subjected to repeated adhesive sliding contacts was also the objective of this analysis. Numerical results provided insight into the effects of the aforementioned parameters on the friction and normal forces, stress-strain response, and evolution of subsurface plasticity with the accumulation of sliding cycles. The steady-state mode of deformation due to repeated adhesive sliding contacts was examined for both EPP and ELKP material behavior. Subsurface cracking in a layered medium consisting of an elastic hard layer and an elastic-plastic substrate due to adhesive sliding against a rigid asperity was analyzed using linear elastic fracture mechanics (LEFM) and FEM model. The dominance of shear and tensile mode of crack propagation was examined in terms of the interaction depth, layer thickness, crack location, crack length, work of adhesion, and mechanical properties of the thin layer and substrate materials. The effect of adhesion on asperity failure due to normal contact was also studied. The crack growth direction, dominant fracture mode, and crack growth rate were predicted as functions of the initial crack position, asperity interaction distance, interfacial properties, and mechanical properties. FEM results showed the occurrence of different crack mechanisms, such as of crack-face opening, slip, and stick. The evolution of the surface topography during nanoscale surface polishing was studied with a three-dimensional stochastic model that accounts for a multi-scale (fractal) surface roughness and elastic, elastic-plastic, and fully-plastic deformation of the asperities on the polished surface caused by hard abrasive nanoparticles embedded in the soft surface layer of a rigid polishing countersurface. Numerical results of the steady-state roughness of the polished surface, material removal rate, and wear coefficient were determined in terms of the apparent contact pressure, polishing speed, original topography and mechanical properties of the polished surface, average size and density of the nanoparticles, and surface roughness of the polishing plate. The density of hard abrasive nanoparticles embedded in the soft countersurface was predicted by a probabilistic-hydrodynamic model in terms of the surface topographies, particle size distribution, applied forces, macroscopic geometry of the moving surfaces, surface kinematics, and fluid properties. The findings of this dissertation yield new insight into the deformation behavior of adhesive contacts involving homogeneous and layered half-spaces, from the single asperity level to surfaces with multi-asperity topographies. The significance of the interfacial properties and material properties on adhesive asperity sliding contact, the effects of interfacial adhesion and crack properties on asperity cracking and subsurface cracking, and the dependence of the surface topography evolution during nanoscale polishing on the surface topographies, material properties, and abrasive nanoparticle size were examined in the context of numerical and analytical results. The results of this thesis elucidate the mechanical aspects of surface contact interaction in nano/microscale engineering components and surfacing processes, such as hard-disk drives, micro-electro-mechanical systems, and nanoscale surface polishing, and provide insight into the underlying reasons leading to mechanical failure of homogeneous and layered half-spaces subjected to surface tractions. Solutions and FEM results for single-asperity contacts obtained in this work can be integrated into probabilistic analyses of contacting rough surfaces to advance the current state of contact mechanics of surfaces exhibiting multi-asperity topographies.

Analysis and Simulation of Contact Problems

Author : Peter Wriggers
Publisher : Springer Science & Business Media
ISBN 13 : 3540317619
Total Pages : 393 pages
Book Rating : 4.5/5 (43 download)

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Book Synopsis Analysis and Simulation of Contact Problems by : Peter Wriggers

Download or read book Analysis and Simulation of Contact Problems written by Peter Wriggers and published by Springer Science & Business Media. This book was released on 2006-08-15 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: This carefully edited book offers a state-of-the-art overview on formulation, mathematical analysis and numerical solution procedures of contact problems. The contributions collected in this volume summarize the lectures presented by leading scientists in the area of contact mechanics, during the 4th Contact Mechanics International Symposium (CMIS) held in Hannover, Germany, 2005.

Contact Mechanics

Author : K. L. Johnson
Publisher : Cambridge University Press
ISBN 13 : 9780521347969
Total Pages : 472 pages
Book Rating : 4.3/5 (479 download)

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Book Synopsis Contact Mechanics by : K. L. Johnson

Download or read book Contact Mechanics written by K. L. Johnson and published by Cambridge University Press. This book was released on 1987-08-28 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This treatise is concerned with the stresses and deformation of solid bodies in contact with each other, along curved surfaces which touch initially at a point or along a line. Examples are a railway wheel and rail, or a pair of gear wheel teeth. Professor Johnson first reviews the development of the theory of contact stresses since the problem was originally addressed by H. Hertz in 1882. Next he discusses the influence of friction and the topographical roughness of surfaces, and this is incorporated into the theory of contact mechanics. An important feature is the treatment of bodies which deform plastically or viscoelastically. In addition to stationary contact, an appreciable section of the book is concerned with bodies which are in sliding or rolling contact, or which collide.

Interfacial Mechanics

Author : Jane Wang
Publisher : CRC Press
ISBN 13 : 0429526210
Total Pages : 1005 pages
Book Rating : 4.4/5 (295 download)

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Book Synopsis Interfacial Mechanics by : Jane Wang

Download or read book Interfacial Mechanics written by Jane Wang and published by CRC Press. This book was released on 2019-12-06 with total page 1005 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the characteristics of material contact and lubrication at tribological interfaces is of great importance to engineering researchers and machine designers. Traditionally, contact and lubrication are separately studied due to technical difficulties, although they often coexist in reality and they are actually on the same physical ground. Fast research advancements in recent years have enabled the development and application of unified models and numerical approaches to simulate contact and lubrication, merging their studies into the domain of Interfacial Mechanics. This book provides updated information based on recent research progresses in related areas, which includes new concepts, theories, methods, and results for contact and lubrication problems involving elastic or inelastic materials, homogeneous or inhomogeneous contacting bodies, using stochastic or deterministic models for dealing with rough surfaces. It also contains unified models and numerical methods for mixed lubrication studies, analyses of interfacial frictional and thermal behaviors, as well as theories for studying the effects of multiple fields on interfacial characteristics. The book intends to reflect the recent trends of research by focusing on numerical simulation and problem solving techniques for practical interfaces of engineered surfaces and materials. This book is written primarily for graduate and senior undergraduate students, engineers, and researchers in the fields of tribology, lubrication, surface engineering, materials science and engineering, and mechanical engineering.

3D Numerical Modeling of Dry/wet Contact Mechanics for Rough, Multilayered Elastic-plastic Solid Surfaces and Effects of Hydrophilicity/hydrophobicity During Separation with Applications

Download 3D Numerical Modeling of Dry/wet Contact Mechanics for Rough, Multilayered Elastic-plastic Solid Surfaces and Effects of Hydrophilicity/hydrophobicity During Separation with Applications PDF Online Free

Author : Shaobiao Cai
Publisher :
ISBN 13 :
Total Pages : 204 pages
Book Rating : 4.:/5 (236 download)

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Book Synopsis 3D Numerical Modeling of Dry/wet Contact Mechanics for Rough, Multilayered Elastic-plastic Solid Surfaces and Effects of Hydrophilicity/hydrophobicity During Separation with Applications by : Shaobiao Cai

Download or read book 3D Numerical Modeling of Dry/wet Contact Mechanics for Rough, Multilayered Elastic-plastic Solid Surfaces and Effects of Hydrophilicity/hydrophobicity During Separation with Applications written by Shaobiao Cai and published by . This book was released on 2008 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Adhesion, friction/stiction and wear are among the main issues in magnetic storage devices, microelectromechanical systems (MEMS/NEMS), and other commercial devices having contacting interfaces with normal or tangential motion. Relevant parameters, i.e., layer thicknesses and their mechanical properties for the contact solid surfaces, the roles of meniscus and viscous forces for separation of surfaces from liquid films, need to be studied to provide a fundamental understanding of the phenomenon and the physics of the experienced problems. The simulation of contact mechanics and the modeling of separation of two surfaces with and without liquid mediated contacts are effective ways to investigate these issues. In the simulation of contact mechanics, a numerical three-dimensional (3D) rough multilayered contact model is developed to investigate the effects of roughness, stiffness, hardness, layer thicknesses, load, coefficient of friction, and meniscus contribution of elastic-perfectly plastic solid surfaces. The model is based on a variational principle in which the contact pressure distributions are those that minimize the total complementary potential energy. The quasi-Newton method is used to find the minimum. The influence coefficients of the displacements and stresses for a multilayered contact model are determined using the Papkovich-Neuber potentials with a Fast Fourier Transform (FFT) based scheme. Contact analysis of multilayered structures under both dry and wet conditions with and without sliding which simulates the actual contact situations of those devices is performed to identify and obtain optimum design parameters including materials with desired mechanical properties, layer thicknesses, and to predict and analyze the contact behavior of devices in operation. In the modeling of separation of two surfaces with liquid mediated contacts, numerical models of normal and tangential separation of smooth or rough surfaces are developed. The analyses for both forces during normal and tangential separation of hydrophilic and hydrophobic smooth or rough surfaces with symmetric and asymmetric contact angles, and viscous force effects during tangential separation are presented. The important design parameters, i.e., separation distance, initial meniscus height, separation time, contact angle, and roughness are analyzed. The analyses provide a fundamental understanding of the physics of separation process and insights into the relationships between both the forces. Implications of these analyses in macro/micro/nano technologies are discussed. Applications of the 3D multilayered rough contact model to magnetic storage devices and applications of the model of separation of two surfaces from liquid thin film to macro/micro/nano technologies are discussed.

Contact Mechanics

Author : M. Jean
Publisher : Springer Science & Business Media
ISBN 13 : 1461519837
Total Pages : 473 pages
Book Rating : 4.4/5 (615 download)

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Book Synopsis Contact Mechanics by : M. Jean

Download or read book Contact Mechanics written by M. Jean and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings volume contains 66 papers presented at the second "Contact Mechanics International Symposium" held in Carry-Le-Rouet. France. from September 19th to 23rd. 1994, attended by 110 participants from 17 countries. This symposium was the continuation of the first CMIS held in 1992 in Lausanne. of the Symposium Euromech 273 "Unilateral Contact and Dry Friction" held in 1990 in La Grande Motte. France. and of the series of "Meetings on Unilateral Problems in Structural Analysis" organized in Italy. every other year. during the eighties. The primary purpose of the symposium was to bring specialists of contact mechanics together in order to draw a representative picture of the state of the art and to identify new trends and new features in the field. In view of the contributions made. one may assert that the mechanics of contact and friction has now reached a stage where the foundations are clear both from the mathematical and from the computational standpoints. Some of the difficulties met may be identified by saying that frictional contact is governed by resistance laws that are non smooth and whose flow rule is not associated with the yield criterion through the traditional normality property.

Introduction to Tribology

Author : Bharat Bhushan
Publisher : John Wiley & Sons
ISBN 13 : 1118403223
Total Pages : 677 pages
Book Rating : 4.1/5 (184 download)

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Book Synopsis Introduction to Tribology by : Bharat Bhushan

Download or read book Introduction to Tribology written by Bharat Bhushan and published by John Wiley & Sons. This book was released on 2013-02-14 with total page 677 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fully updated version of the popular Introduction to Tribology, the second edition of this leading tribology text introduces the major developments in the understanding and interpretation of friction, wear and lubrication. Considerations of friction and wear have been fully revised to include recent analysis and data work, and friction mechanisms have been reappraised in light of current developments. In this edition, the breakthroughs in tribology at the nano- and micro- level as well as recent developments in nanotechnology and magnetic storage technologies are introduced. A new chapter on the emerging field of green tribology and biomimetics is included. Introduces the topic of tribology from a mechanical engineering, mechanics and materials science points of view Newly updated chapter covers both the underlying theory and the current applications of tribology to industry Updated write-up on nanotribology and nanotechnology and introduction of a new chapter on green tribology and biomimetics

15th Wear of Materials

Author : Peter J. Blau
Publisher : Elsevier
ISBN 13 : 9780080447360
Total Pages : 826 pages
Book Rating : 4.4/5 (473 download)

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Book Synopsis 15th Wear of Materials by : Peter J. Blau

Download or read book 15th Wear of Materials written by Peter J. Blau and published by Elsevier. This book was released on 2005-10-03 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings of the 15th International Conference on Wear of Materials focus on the friction and wear of materials in various applications under different environments from the nanometer scale to the meter scale. The conference provides a unique international forum for researchers and practitioners from different disciplines to exchange latest results. Coverage includes: . Wear assessment and monitoring . Wear modeling, mechanisms, mapping and prediction . Wear-corrosion testing and control . Surface engineering for wear and wear-corrosion control . Development of new wear test methods and wear test methodologies . Wear of materials for biomedical applications . Wear of non-equilibrium materials: from atomic dimensions to the micro-scale . Wear of hard and superhard materials . Wear of materials in the earthmoving, minerals processing and mining industries

Journal of Tribology

Author :
Publisher :
ISBN 13 :
Total Pages : 468 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis Journal of Tribology by :

Download or read book Journal of Tribology written by and published by . This book was released on 2007 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Computational Methods in Contact Mechanics IV

Author : L. Gaul
Publisher :
ISBN 13 :
Total Pages : 566 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Computational Methods in Contact Mechanics IV by : L. Gaul

Download or read book Computational Methods in Contact Mechanics IV written by L. Gaul and published by . This book was released on 1999 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: Containing contributions from the Fourth International Conference on Contact Mechanics, this work aims to demonstrate that the discipline is still undergoing rapid development. The papers featured cover contact problems for machine elements such as gears, bearings, brakes, metal-forming tools, absorbers and joints; models and experimental results for rough surfaces in contact; contact problems for layered and reinforced half space regions studied by theory and by experiment; and improvements of contact description by finite element, boundary element, multi-body and continuous models, including new algorithms based on variational inequalities.

Computational Methods in Contact Mechanics VI

Author : C. A. Brebbia
Publisher : WIT Press (UK)
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Computational Methods in Contact Mechanics VI by : C. A. Brebbia

Download or read book Computational Methods in Contact Mechanics VI written by C. A. Brebbia and published by WIT Press (UK). This book was released on 2003 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern engineering design has led to the realization of the importance of contact problems in many technological fields. Including discussions of mechanical models, numerical aspects, experimental measurements and engineering applications as well as other topics related to the subject, this volume features the proceedings of the Sixth International Conference on Computational Methods and Experimental Measurements in Contact Mechanics. Particular emphasis is placed on the application of advanced theories, while the contributors have also been encouraged to critically review existing ideas and to explore new research ideas. Topics covered include: multi-boundary contact; extrusion and forming process; composite materials; soil structure interaction; computational methods; crashworthiness, impact and shock; biomechanics; experimental techniques; computational methods versus experimental results; and fracture, fatigue and wear.