【摘要】 本文基于Taylor理论,引入滑移系临界切应力τ_c~8与孪生系临界切应力之比对初始晶向随机分布的面心立方金属的屈服行为进行了计算,孪晶出现的条件与文献一致,机械孪晶的出现,可使应力π平面出现各向异性,并预测只有剪应力情况下,仍保持各向同性。更多还原

【Abstract】 The yield behaviours of F. C. C metals whose initial crystal orientations are randomly distributed have been calculated with Taylor Model and the ratio of the criti-cals resolved shear stress for twinning against slip is introduced. The condition under which mechanical twinning occurs is just the same as that of reference. When twinning occurs ,an isotropic behavious will be found on K梡lane sections of stresses and we predict that under such condition only shear exists,isotrope still remains.更多还原