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。

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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。

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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。

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