RIA: Analysis of Failure Mechanisms in Thin Coatings

一项研究启动奖将支持对薄涂层潜在失效机制的分析发展。将考虑三种主要的破坏形式：涂层或基体或其界面的断裂，单次和多次加载下的塑性流动，以及蠕变引起的裂纹扩展破坏。脆性涂层在脆性基体上的界面断裂将采用界面断裂力学进行建模。对于韧性基板上的硬质涂层，将采用安定极限法来计算层状固体在反复接触载荷下的循环塑性变形。此外，还将建立模型来分析在高三轴残余应力下薄膜中随时间变化的裂纹和空洞生长。

A Research Initiation Award will support development of an analysis of the potential failure mechanisms of thin coatings. Three main forms of failure will be considered: fracture of the coating or substrate or of their interface, plastic flow in single and multiple loading, and failure by creep induced crack growth. Interfacial fracture of brittle coatings on brittle substrates will be modeled using interfacial fracture mechanics. For hard coatings on a ductile substrate a shakedown limit method will be used to calculate the cyclic plastic deformation of layered solids under repeated contact loading. In addition, models will be developed to analyze time dependent crack and void growth in thin films under high triaxial residual stresses.