在建立多体模型时如何定义薄膜或者织物这类正交各向异性材料进行分析？以下为error里面的提示信息

Anisotropic material properties without a local orientation system have been defined for 1512 elements. Anisotropic material properties must be defined in a local orientation system. The elements are identified in element set ErrElemAnisotropicMaterial.