This situation makes the concept of elementary volume and Saint-Venant's deformation compatibility condition used in continuum mechanics problematic.
这种情况使连续介质力学中使用的基本体元的概念及圣维南变形协调条件受到了置疑。
And then the governing equations of the block dynamic system are deduced on the basis of the virtual work principle, the deformation compatibility condition and the constitutive relations.
随后，基于虚功原理、变形协调条件和本构关系，推导了块体动力系统的控制方程组。
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