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利用泰勒理论描述了体心立方织构材料的塑性变形.一种适用于这种材料的模型是:在一定三轴应变状态下,考虑材料中存在{110}〈111〉、{112}〈111〉和{123}〈111〉3种滑移系,引入不同滑移系间临界分切应力比及机械孪晶的权重,按照泰勒理论,结合最小内功原则,确定相对主应变坐标参考系任定取向晶粒的泰勒因子(反映变形功或变形阻力).进而利用织构取向分布函数(ODF)分析法,对单晶性质进行织构计权平均,求取多晶材料宏观平均泰勒因子,最终获得反映材料深冲性能的重要参数R值.通过对IF钢的R值进行模拟计算,并与实测R值进行比较,结果满意,证明构模合理,方法具有实用价值
Taylor’s theory is used to describe the plastic deformation of the body-centered cubic textured material. A suitable model for this material is to consider the existence of {110} <111>, {112} <111 And {123} <111>, the critical shear stress ratio and the mechanical twins’ weight between different slip systems are introduced. According to Taylor’s theory and the principle of minimum internal work, the relative principal strain reference system is determined And the Taylor factor of grain orientation (reflecting the work of deformation or resistance of deformation) .According to the texture orientation distribution function (ODF) analysis method, the weight of the single crystal is weighed averagely, and the macroscopic average Taylor factor of the polycrystalline material is obtained finally The value of R, which is an important parameter to reflect the deep drawability of the material, was obtained.The R value of IF steel was simulated and compared with the measured R value, the result was satisfactory, which proves that the structure is reasonable and the method has practical value