... 平面应力 plane stress 平面伸展型成 plane stretch forming 平面测量 plane surveying ...
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The zone between the region contacted with bottom of the mould and the free forming region shows stretch forming and then transferred to plane strain state.
模底接触区与自由变形区交界处的大塑性变形区依次处于板料曲面内双向伸长变形和平面应变状态；
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