RIA: Analysis of Failure Mechanisms in Thin Coatings

研究启动奖将支持对薄涂层潜在失效机制的分析。将考虑三种主要的失效形式：涂层或基材或其界面的断裂，单次和多次加载下的塑性流动，以及蠕变引起的裂纹扩展。脆性涂层在脆性衬底上的界面断裂将用界面断裂力学来模拟。对于韧性衬底上的硬涂层，采用安定极限法计算层状固体在反复接触载荷作用下的循环塑性变形。此外，还将建立模型来分析高三轴残余应力下薄膜中随时间变化的裂纹和孔洞扩展。

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.