Singular Fields at Piezoelectric Bimaterial Interfaces and Their Use for Failure Criteria and Advanced Analysis

9523073 Dunn界面失效对制造可靠的压电致动器和换能器提出了严峻的挑战。 拟议的研究解决了这个重要的问题，通过使用紧密耦合的理论和实验程序来研究在粘结压电材料的自由边缘的电场和机械场的奇异行为。 的奇异性是估计分析使用渐近分析，这些分析结果，然后将被用于有限元分析，预测一个实际的压电几何形状的响应。 然后确定自由边应力强度因子。 自由边缘应力强度因子是几何形状和所施加载荷的函数，并且将充分表征奇异场占主导地位的区域中的界面拐角处的电场和机械场。 实验研究提出了使用应力强度因子预测故障的有效性。 ***

9523073 Dunn Interfacial failures pose a serious challenge in manufacturing reliable piezoelectric actuators and transducers. The proposed research addresses this important problem by using a tightly coupled theoretical and experimental program to study the singular behavior of electric and mechanical fields at the free edges of bonded piezoelectric materials. The singularities are to be estimated analytically using an asymptotic analysis and these analytical results are to be then used within a finite element analysis to predict the response of a practical piezoelectric geometry. Free edge stress intensity factors are then to be determined. The free edge stress intensity factors are functions of geometry and the applied loading and will fully characterize the electrical and mechanical fields at the interface corner in the region dominated by the singular fields. Experimental studies are proposed to validate the use of stress intensity factors in predicting failures. ***