Because of the complexity in mathematics and the physics, solving the three-dimensional dynamic stress intensity factors is certainly limit.
三维裂纹在动态断裂力学中由于其数学和物理上的复杂性，求解其动态应力强度因子受到一定的限制。
Therefore, to develop the composite with high permittivity, which can control electrical stress, has become an important subject in the field of engineering dielectric physics.
因此，研究与寻找具备高介电常数的电应力控制新型聚合物基复合材料就成为工程电介质物理领域研究的重要课题。
The thickness and physics mechanics nature of rock parting have important influence on the stress distribute and its movement of top coal.
夹矸层的厚度及物理力学性质对顶煤的应力分布和移动有重要影响；
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