Numerical Simulation of Elastic Bilayered Contact. Part II _ Stress State Analysis

6th ModTech International Conference - Modern Technologies in Industrial Engineering

Spinu, S.^1,2 ; Cerlinca, D.^1,2

Department of Mechanics and Technologies, Stefan Cel Mare University of Suceava, 13th University Street, 720229, Romania^1

Integrated Center for Research, Development and Innovation in Advanced Materials, Nanotechnologies, and Distributed Systems for Fabrication and Control (MANSiD), Stefan Cel Mare University, Suceava, Romania^2

关键词: Coating performance;    Conventional techniques;    Elastic properties;    Frequency response functions;    Semi-analytical methods;    Stress state analysis;    Tribological systems;    Von Mises equivalent stress;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/400/4/042055/pdf
DOI  :  10.1088/1757-899X/400/4/042055

来源: IOP

【 摘 要 】

In a tribological system containing protective coatings, the knowledge of stresses generated in both the hard layer and the substrate are essential to the design of the tribological elements. The stress field due to the contact load is required to assess the coating performance and to guide the coating design. Rough contact analyses can only be performed numerically, but conventional techniques applied to layered solids may lead to very time-consuming simulations. The semi-analytical method for the analyses of contact stresses in a bilayered medium advanced in the companion paper is enhanced and applied to stress analyses in the layered body. The main difficulty in applying FFT-based spectral analysis to the study of subsurface stresses consists in the treatment of the frequency response function (FRF) at the origin of the frequency domain, where the FRF may be singular. As the FRF is integrable in the neighbourhood of the origin, the discrete sample corresponding to the patch centred in origin is substituted by the average value over the latter patch. The conditions of stress continuity at the interface between the protective layer and the substrate are verified. The influence of both coating thickness and dissimilarity in the elastic properties between the coating and the substrate, on the intensity of the maximum von Mises equivalent stress, is assessed. The numerical examples prove the method ability to tackle contact scenarios involving protective coatings and to assist the design of competent tribological elements.