Effect of an adhesive interlayer on the fracture of a brittle coating on a supporting substrate
Effect of an adhesive interlayer on the fracture of a brittle coating on a supporting substrate
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DOI：
10.1557/jmr.2003.0031
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发表时间：
2003-01-01
影响因子：
2.7
通讯作者：
Lawn, BR
中科院分区：
文献类型：
--
作者：
Kim, JH;Miranda, P;Lawn, BR
研究了柔性粘接中间层在确定脆性涂层与异种材料基体结合的下表面径向断裂临界条件中的作用。临界载荷的半经验关系是通过将胶粘剂作为有效基材的一部分来推导的，从而将问题减少到双层的问题。对硅/环氧树脂/玻璃模型系统进行了有限元分析，以评估分析关系中的可调参数。在同一材料体系上进行了裂纹萌生的现场实验观察，验证了这些关系。临界载荷敏感地依赖于胶粘剂的厚度和模量。在粘结不良的试样中，界面处的分层大大降低了临界载荷。该分析结果为胶粘剂连接脆性涂层的未来抗断裂性能预测提供了依据。
The role of a compliant adhesive interlayer in determining critical conditions for radial fracture at the undersurfaces of brittle coatings bonded to substrates of dissimilar materials is investigated. Semi-empirical relations for the critical loads are derived by treating the adhesive as part of an effective substrate, thereby reducing the problem to that of a bilayer. A finite-element analysis of a model silicon/epoxy/glass system is used to evaluate adjustable parameters in the analytical relations. In situ experimental observations of crack initiation on the same material system are used to verify these relations. The critical loads depend sensitively on the adhesive thickness and modulus. Delamination at the interface in poorly bonded specimens greatly reduces the critical loads. This analysis affords a basis for predicting the prospective fracture resistance of brittle coatings joined by adhesives.