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for A Unified Theory for Modeling Damage to Real Surfaces in Contact

===Leon Keer, Ph.D.===
==A unified theory for modeling damage to real surfaces in contact==


Real surfaces in contact are subject to damage such as wear and plastic deformation, which deteriorates surface performance and leads to material failure. Prediction of surface damage is thus of critical importance in the design of advanced materials for aerospace, biomedical, and energy applications. This talk presents a theory to predict surface damage by exploring the role of imperfections within a material. Imperfections are represented by inhomogeneous inclusions, which have different material properties as compared to the surrounding matrix and contain inelastic strain. The present theory consists of a general solution for multiple inhomogeneous inclusions of 3D arbitrary shape located beneath surfaces under contact loading. The solution takes into account inclusion-inclusion and inclusion-loading body interactions to provide an accurate knowledge of surface deformation and pressure and subsurface elastic field. We demonstrate that a layer of film can be treated as an inhomogeneous inclusion, thus enabling elastic-plastic indentation on thin films with imperfections to be modeled. The inhomogeneous inclusion-based theory unifies the ability to model damages such as chipping wear and gradual wear and the competition among them.

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