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可以为实体指定三个方向（x, y, z）上的刚度。 The material model for this is named Orthtropic Elastic 3D or Orthotropic Plastic 3D (Image 01).
The stiffness can be defined for the modulus of elasticity and the shear modulus of the solid. The direction depends on the orientation of the solid (Image 02).
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实体的方向