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复合材料的各向异性特。

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

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。