It is shown that the change of loading strain path will affect the forminglimitcurve.
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。
2
By analyzing the real stress - strain curve with theory of plastic instability and using this testing method, another form of the forminglimit 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。
3
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 forminglimit.