A Finite Element Investigation of the Deformations, Forces, Stress Formations, and Energy Lossses in Elasto-plastic Sliding Contacts
A Finite Element Investigation of the Deformations, Forces, Stress Formations, and Energy Lossses in Elasto-plastic Sliding Contacts

Author: Raghvendra Vijaywargiya

Publisher:

Published: 2006

Total Pages:

ISBN-13:

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This work presents the results of Finite Element Analyses (FEA) used to simulate sliding contact in two (2D) and three dimensions (3D) between two interfering elasto-plastic bodies. Cylinders are used to model sliding contact in 2D, simplified by the assumption of plane strain. Sliding is studied between two cylinders modeled with material properties of steel, and separately with a Glidcop cylinder sliding over an Al 6061-T651 cylinder. All materials are modeled as elastic-perfectly plastic and follow the von Mises yield criterion. Both frictionless as well as frictional sliding are investigated. The FEA results in trends in the deformation, reaction forces, stresses, and net energy loss as a function of sliding distance. All these results are found to be related to the magnitude of vertical interference. This work shows that for the plastic loading cases of frictionless sliding, the ratio of the vertical force to the horizontal reaction force is not zero at the point where the bodies are perfectly aligned about the vertical axis. This work also presents empirical equations that relate the net energy loss due to sliding under an elasto-plastic deformation as a function of the sliding distance. In addition, a load ratio of the horizontal reaction force to the vertical one is defined for frictionless sliding. Although this is analogous to the common definition of the coefficient of friction between sliding surfaces, it just contains the effect of energy loss in plasticity. The contact dimensions are obtained for different vertical interferences as sliding progresses. Comparisons are drawn between the FEA results of frictional and frictionless sliding. 3D modeling has been initiated to yield similar result parameters.

Finite Element Analysis of Beam-to-Beam Contact
Finite Element Analysis of Beam-to-Beam Contact

Author: Przemyslaw Litewka

Publisher: Springer Science & Business Media

Published: 2010-04-24

Total Pages: 175

ISBN-13: 3642129404

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Phenomena occurring during a contact of two bodies are encountered in everyday life. In reality almost every type of motion is related to frictional contact between a moving body and a ground. Moreover, modeling of simple and more complex processes as nailing, cutting, vacuum pressing, movement of machines and their elements, rolling or, finally, a numerical simulation of car crash tests, requires taking contact into account. Therefore, its analysis has been a subject of many research efforts for a long time now. However, it is author’s opinion that there are relatively few efforts related to contact between structural elements, like beams, plates or shells. The purpose of this work is to fill this gap. It concerns the beam-to-beam contact as a specific case of the 3D solids contact. A numerical formulation of frictional contact for beams with two shapes of cross-section is derived. Further, a couple of effective methods for modeling of smooth curves representing beam axes are presented. A part of the book is also devoted to analyze some aspects of thermo-electro-mechanical coupling in contact of thermal and electric conductors. Analyses in every chapter are illustrated with numerical examples showing the performance of derived contact finite elements.

Finite Element Analysis of Elastomers
Finite Element Analysis of Elastomers

Author: David Boast

Publisher:

Published: 1999

Total Pages: 304

ISBN-13:

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Written by leading researchers and practitioners, Finite Element Analysis of Elastomers blends established knowledge in this important area with up-to-date research topics, practical hints and thought-provoking new ideas. The Editors, have compiled contributions by leading researchers and practitioners in finite element analysis (FEA): the result is an authoritative and agenda-setting volume. Finite element modelling can only be as good as the constitutive laws (material models) used, the means of obtaining and fitting the data for those models, and the accuracy of the boundary conditions. (The latter is of particular importance in cases of contact.) All three questions recieve particular attention in this book, as do aspects such as the interpretation and accuracy of FE outputs, with many practical examples being given. There is a short section on fatigue and failure, where particular concerns and approaches in this challenging area are discussed. Comprehensive coverage is given to particular issues concerning the problems of working with real elastomers, especially filled materials. Key features include: Constitutive laws for hyperelastic and inelastic aspects of behaviour Appropriate test methods Curve fitting to obtain constants for constitutive laws Interpretation of finite element results Modelling of crack growth Example applications.