Complex analysis of anisotropic elasticity indicates that the degree of anisotropy (orthotropy) is characterized by two basic complex parameters.

正交各向异表征复合材料的各向异特征。

The functionally graded layers are inhomogeneous along the thickness direction, while the piezoelectric layer is homogeneous;both possess material orthotropy.

假上下功能梯层的材料参数沿厚变化，而压电层则是均匀材料，并且它们都是正交各向异的。