1. The functionally graded layers are inhomogeneous along the thickness direction, while the piezoelectric layer is homogeneous;both possess material orthotropy.
   假设上下功能梯度层的材料参数沿厚度连续变化，而压电层则是均匀材料，并且它们都是正交各向异性的。
2. Complex analysis of anisotropic elasticity indicates that the degree of anisotropy (orthotropy) is characterized by two basic complex parameters.
   正交各向异性可以表征复合材料的各向异性特征。

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