【摘要】 应用TBH理论揭示了在Lequeu等提出的五维应力空间中,各向同性fcc和bcc金属的任意两个切应力构成的屈服轨迹近似地为由主应力构成的π平面的屈服轨迹的内切圆,在此基础上,提出了以HHH屈服函数为基础的,其参数由M_p和τ_c两个微观参数完全确定的解析屈服函数更多还原

【Abstract】 Isotropic yield surfaces of both fcc and bcc metals have been simulated with theTBH model. Using the five--dimensional stress space proposed recently by Lequeu et al., theyield subsurface on any two of the three shear stresses can be considered approximately as in-scribed circles of their corresponding subsurface on π plane. Based on this concept, the HHHyield function has been transformed into the form where the parameters are uniquely deter-mined by two crystallographic factors: the mean Taylor factor in plane strain (M_p) and thecritical shear stress (τ_c) on slip systems.更多还原