A criterion for the avoidance of edge cracking in layered systems
作者单位：Materials DepartmentUniversity of California Santa BarbaraSanta BarbaraCA 93106USA
会议日期：2007年
学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学]
摘 要：When fabricating multi-layers with brittle constituents,a prevalent design strategy is to choose fabrication conditions and thermal expansion coefficients that impose in-plane compression on the brittle *** such designs,a small zone of out-of-plane tension is induced at the edges that can cause cracks to form and extend,especially along the *** associated stresses and energy release rates have been analyzed,revealing a fail-safe criterion,attributed to the existence of a maximum possible energy release rate,*** this maximum to the toughness defines a fail-safe parameter expressing the influence of the layer thickness,the misfit stress and the *** fail-safe designs cannot be realized,thin inter-layers can be interposed in a manner that diminishes G,broadening *** roles of misfit stress and inter-layer thickness in attaining this condition are derived.