Designing damage-resistant brittle-coating structures: I. Bilayers
Designing damage-resistant brittle-coating structures: I. Bilayers
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DOI：
10.1016/s1359-6454(03)00290-8
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发表时间：
2003-08-15
期刊：
影响因子：
9.4
通讯作者：
Lawn, BR
中科院分区：
文献类型：
--
作者：
Miranda, P;Pajares, A;Lawn, BR
涂层/基底双层的有限元分析研究进行损伤分析的基础。注意力集中在沿着接触轴的应力直接相邻的双层界面，在径向裂纹或在涂层屈服。或基材中的屈服倾向于发生。应力分析用于确定临界载荷，以根据基本材料特性和涂层厚度启动每种损坏模式。控制材料参数是强度（脆性模式）和屈服应力或硬度（塑性模式）。的临界载荷被证明有一个简单的二次依赖于涂层厚度，但更复杂的依赖于弹性模量失配比。简化的显式模量函数提供了一种途径来预测的临界载荷的设计目的。有关的影响，双层膜的设计为特定的应用进行了讨论。由爱思唯尔有限公司代表Acta Materialia Inc.出版。
A FEA study of coating/substrate bilayers is conducted as a foundation for damage analysis. Attention is focused on the stresses along the contact axis immediately adjacent to the bilayer interface, where radial cracking or yield in the coating. or yield in the substrate, tend to occur. The stress analysis is used to determine critical loads to initiate each damage mode in terms of basic material properties and coating thickness. Controlling material parameters are strength (brittle mode) and yield stress or hardness (plastic mode). The critical loads are shown to have a simple quadratic dependency on coating thickness, but more complex dependencies on elastic modulus mismatch ratio. Simplified explicit modulus functions afford a route to prediction of the critical loads for design purposes. Implications concerning, the design of bilayers for specific applications are discussed. Published by Elsevier Ltd on behalf of Acta Materialia Inc.