So it "s more convenient and practical to use FLSD as the criterion of forming limit."
因此，成形极限应力图作为复杂加载路径的成形极限判据更加方便和实用。
While FLSD, which is stress-based and independent of strain path, has become the hotspot in this field.
而以极限应力构成的成形极限应力图FLSD由于不依赖加载应变路径，已成为目前研究的热点。
The research progresses on FLSD were summarized, and the existing problems of FLSD were also pointed out.
综述了国内外成形极限应力图的研究进展，并指出了目前成形极限应力图研究所面临的主要问题。
Some foreign scholars developed the concept of Forming Limit Stress Diagram (FLSD) on the basis of FLD. FLSD is considered as strain path independent.
一些国外学者在板料成形极限图的基础上提出了板料应力成形极限图(FLSD)的概念，并认为板料应力成形极限图具有与路径无关的特点。
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，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 thesis validates through actual experiments that FLSD is much more reliable and effective than the strain-based FLD in determining the multistage part formability under complex strain paths.
本文通过实例验证了FLSD在判断复杂应变路径下的多道次零件成形比基于应变的成形极限图更加可靠、有效。
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.
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.
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。
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