由此对通常认为比较抽象的偏应力张量不变量的意义与作用有更深层次的理解。
So, a deeper understanding of the significance and the role of the invariants of the stress deviator which are considered more abstractly has been given.
为了描述材料的各向异性，引入了一个由应力张量和组构张量的联合不变量表达的各向异性参数。
To characterize relative orientation between the loading direction and material fabric, an anisotropic variable expressed by the joint invariants of the stress tensor and fabric tensor is introduced.
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