When the equivalent plastic strain reaches 0.002, metals can be treated as yielded. In this study, at the yielding stage, using the assumptions such as: 1) elastic strain can assist in coordinating plastic strain; 2) ignoring the need to activate five independent slip systems simultaneously; 3) the strain hardening of slip systems to be linear; and 4) ignoring the intergranular strain coordination behavior, a new progressive polycrystalline yield criterion is established. This new criterion better reflects the inherent mechanisms of yielding compared to phenomenological models and requires less computational effort than VPSC or EVPSC. Experimental validation results demonstrated that the new criterion accurately reproduced experimental outcomes.

中文翻译：

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镁合金新的渐进多晶屈服准则

当等效塑性应变达到0.002时，金属可以视为屈服。在本研究中，在屈服阶段，使用以下假设：1）弹性应变可以帮助协调塑性应变； 2) 忽略同时激活五个独立滑动系统的需要； 3）滑移系统的应变硬化是线性的； 4)忽略晶间应变协调行为，建立了新的渐进多晶屈服准则。与现象学模型相比，这一新标准更好地反映了屈服的内在机制，并且比 VPSC 或 EVPSC 需要更少的计算量。实验验证结果表明，新标准准确地再现了实验结果。