用两种不同的双拉成形技术获取成形极限曲线。
Forming Limit curves (FLCS) are constructed by two different kinds of shrinking methods in the paper.
试验结果表明：加载应变路径的变化会影响成形极限曲线的高低。
It is shown that the change of loading strain path will affect the forming limit curve.
成形极限图通常是通过钢模胀形试验测得，实际测量的成形极限图与ASAME自动应变测试分析系统模拟计算的成形极限曲线吻合较好。
FLD is usually measured with swell test in rigid die. The tested FLD is good fit that one measured by analogue computer in ASAME (Automated Strain Analysis and measure Environment).
结果表明，成形极限应力图不受应变路径影响，对于同一失稳准则，在不同加载应变路径下几乎为同一条曲线。
The result shows that FLSD is independent of strain path, and that the FLSD under different strain paths are almost the same curve according to the same instability theory.
结果表明，对于同一失稳准则，在不同加载应变路径下FLSD几乎为同一条曲线，FLSD作为复杂加载路径板料成形极限判据更加方便。
The result shows that the FLSD under different strain paths are almost the same curve according to the same instability theory and it's more convenient to use FLSD as the criterion of forming limit.
在利用共稳理论对实际应力应变曲线进行分析的同时，得出了求作板材成形极限图的新方法。
By analyzing the real stress - strain curve with theory of plastic instability and using this testing method, another form of the forming limit diagram has been found.
在利用共稳理论对实际应力应变曲线进行分析的同时，得出了求作板材成形极限图的新方法。
By analyzing the real stress - strain curve with theory of plastic instability and using this testing method, another form of the forming limit diagram has been found.
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