Abstract
Plastic deformation resulting from high stress exceeding material yield limit widely exists in many mechanical components, especially for those subjected to impact load, which further compromises the accuracy and reliability of the affected parts. Coating technology is an effective way to provides protection for the substrate against the heavy impact load. A novel solution method for simulating the elastoplastic impact-contact of coated medium is presented in the current investigation. The second-order Newmark algorithm is introduced for impact dynamics iteration. The plastic yielding and plastic strain accumulation during impact process are determined by the von Mises yield criteria. The effectiveness of the proposed solution method is demonstrated numerically by the finite element method (FEM) via commercial software and experimentally by a nano-impact test. Impact-contact problems for a rigid spherical punch against a coated medium with either a rough or smooth surface are further studied to illustrate the elastoplastic mechanical response of materials under impact contact load.
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