Compared with isotropic materials, the composite material has evident advantages.
复合材料与各向同性材料相比具有明显优势。
Two cases are discussed: one is for isotropic material and the other for orthotropic material.
讨论了两种情形：一是各向同性材料的，一是正交各向异性材料的。
Concrete is assumed to be an isotropic material, and deformations due to Poisson's ratio are ignored.
混凝土假设为各向同性材料，且忽略计算变形时的泊松比效应。
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