涂层和未涂层铝基体上接触应力的有限元模拟

Finite Element Modeling of Contact Stresses on Coated and Uncoated Aluminum Substrates

基于对涂层/基体系统上产生的接触应力的分析，研究了软基体上薄膜的磨损行为。应用有限元法对由压头向涂层或未涂层铝基体施加正压力的情况进行模拟。先在没有薄膜的系统上对模型的精确性进行检验。然后通过改变薄膜的弹性模量比，开发出适用于铝基体上有两层硬薄膜试样的模型。同时还研究了薄膜厚度和载荷的影响。较厚的薄膜降低了模型上某些点的应力，但是增加了另一些点的应力。从弹性模量的角度来说，薄膜内的计算应力主要与薄膜的弹性模量有关，而通过改变薄膜的弹性模量比几乎不会使应力产生差异。

In this work, the behavior of thin films on soft substrates was studied based on the contact stresses that develop on the coating/substrate system. The finite element method was used to model situations where an indenter applies normal forces to a coated or uncoated aluminum substrate. The accuracy of the model was initially tested in systems without a film. Models were then developed for samplws with two hard layers on the aluminum, varying the ratio of the elastic modulus of the films decrease the stresses in certain points of the model, but increase the stresses in others. In terms of elastic modulus, the stresses calculated in the films ere more related to the elastic modulus of the film, and little difference was found by varying the elastic modulus ratio of the films.