The strength analysis of a drop-shaped tube is resolved into the following problem: axial compression together with a plane state of strain with uniform internal pressure.

把滴形管的强度分析问题分解为：沿管轴线方向的压力问题与管沿周线方向均布压力的平面应变问题的叠加。

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Wave propagation properties for P-SV wave in a free-fixed infinite plate in the state of plane strain problem were investigated.

针对平面应变弹性波动问题，研究了自由-固定边界无限大弹性板中P - SV波的传播特性。

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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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