针对盒形件拉深成形时法兰变形区的变形进行了材料塑性流动的理论分析，提出了位移速度差诱发剪应力的观点。
In of displacement induces shear stress. Shear deformation this paper, flow law of material is theoretically analysed based on deformation of the flange deformed area in box drawing.
研究了北川县城附近区域的剪应力、加速度以及速度场的动态集中现象。
The dynamic concentration phenomena of shear stress, accelerations and velocities are investigated for the area including Beichuan county town with topography surface.
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