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Micromechanics of Asperity Interaction in Wear – A Numerical Approach

Acharya, Sunil
http://rave.ohiolink.edu/etdc/view?acc_num=akron1135267571

Abstract Details

2005, Doctor of Philosophy, University of Akron, Polymer Engineering.
In last 50 years, research on elastomer wear has produced qualitative and statistical data regarding wear debris and associated morphologies. However, the exact wear mechanism and the evolution of wear morphologies is not understood to the level where a quantitative prediction or description of wear is possible In this study a numerical analysis (FEA) has been used to understand mechanical interactions related to pattern wear. A blunt surface crack and it’s interaction with a single penetrating asperity has been modeled for varying frictional, material and kinematic conditions. An interacting asperity creates a deformation field in an elastomeric body. This stress field is altered in the presence of a crack. The resulting stress relief is quantitatively estimated for varying geometric, material and friction parameters. Consequently, the energy available for a new crack to propagate in the vicinity of the existing crack decreases leading to a characteristic spacing between successive cracks. Energy release rate data from fracture experiments on thin rubber sheets is used to calculate the spacing between the cracks. The approach sheds some light on crack propagation characteristics in pattern wear. Other numerical experiments in this study analyze: (1) Elastomer response to dynamic asperity loading (2) Asperity loading at micro-scale where filled rubber has high degree of non-homogeneity (3) Effect of asperity loading at an angle on a rubber flap. As a result, we now better understand the evolution of wear related morphologies.
Arkady Leonov (Advisor)
260 p.
Wear; Rubber; Elastomer; Contact Mechanics; Fracture Mechanics; Energy Release Rate; Finite Element Analysis

Recommended Citations

Citations

  • Acharya, S. (2005). Micromechanics of Asperity Interaction in Wear – A Numerical Approach [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1135267571

    APA Style (7th edition)

  • Acharya, Sunil. Micromechanics of Asperity Interaction in Wear – A Numerical Approach. 2005. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1135267571.

    MLA Style (8th edition)

  • Acharya, Sunil. "Micromechanics of Asperity Interaction in Wear – A Numerical Approach." Doctoral dissertation, University of Akron, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1135267571

    Chicago Manual of Style (17th edition)

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© 2005, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.