Hi, I am working on Piezoelectric(AlN) simple cantiliver acuator, having my cantiliver composite 3-layer beam( Si, SiO2(buffer) and AlN on top as active layer). Physics that I am using is ''Piezoelectric devices'' and study is stationary. When I add materials to its respective layers, Si and SiO2 asks for the ''Coupling matrix and Elasticity matrix'' . I searched many online databasess and documents but didn't found these propeties, if anyone has these or can guide where I find it. Stay blessed
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