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在深冲钢板塑性应变比(γ值)的计算方法中以晶体力学方法最受推崇,这主要是由于该法从晶体塑性形变的滑移入手,充分考虑了晶体形变机理,理论依据可靠。但其中的两点假设:三个滑移系临界分切应力相等和15％形变过程中晶格不发生转动不尽合理。为此,本文在单晶γ值计算时引入了三个滑移系临界分切应力的差别和晶格转动,并借助于等体积分割法计算了深冲钢板织构的体积百分含量,进而经过近真ODF的简化处理,利用Kochendrfer模型计算了08Al深冲钢板的γ值。
In the method of calculating the plastic strain ratio (γ value) of deep-drawn steel plate, the crystal mechanics method is the most respected, mainly because the method starts from the slip of the plastic deformation of the crystal and fully considers the crystal deformation mechanism, and the theoretical basis is reliable. However, two of them assume that the critical shear stresses of the three slip systems are equal and the lattice does not rotate during the 15% deformation. In this paper, the differences of critical shear stress and lattice rotation of three slip systems are introduced in the calculation of single crystal γ value, and the volume percentage of deep-drawn steel plate texture is calculated by means of iso-volume partition method. After the simplification of the near real ODF, the γ value of the 08Al deep drawn steel plate was calculated by Kochendrfer model.