在汽车覆盖件的冲压成型中，可以利用的是板材在稳定变形阶段所能达到的最大变形程度。
In the stamping and forming processes of automotive covering parts, only the maximum deformability, which is reachable in stable deformation stage of sheet metal, can be made use.
采用显式动力学弹塑性有限元方法，对平板轧制过程中咬入阶段的非稳定变形进行了数值模拟。
With the dynamic explicit elastic plastic finite element method, the unsteady deformation of the bite stage in slab rolling was simulated.
结果表明：七种材料的焊件都存在着尺寸不稳定，这种尺寸不稳定变形随时间的变化速率逐渐变缓；
The results show that the weldments made from those metals in as-welded condition are instable in dimension and the rate of dimensional change decreases with time.
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