在建立多體模型時(shí)如何定義薄膜或者織物這類正交各向異性材料進(jìn)行分析？以下為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.