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双向等拉应力状态下材料的真实应变曲线与单向拉伸试验的真实应力应变曲线差别较大，为了探讨应力状态对材料真实应力应变曲线的影响，本文采用不同椭圆形凹模进行液压胀形试验，并将获得的真实在力应变曲线与上述两种真实应力应变曲线进行了对比分析，讨论了应力状态对材料真实应力应变曲线的影响。
In order to investigate the effect of the stress state on the real stress-strain curve of the material, the real strain-strain curve of the material under two-way tensile stress greatly differs from the real stress-strain curve of the uniaxial tensile test. In this paper, different oval- The real stress-strain curves were compared with those of the two real stress-strain curves. The effect of stress state on the real stress-strain curves was also discussed.