CAJ | 학술논문

借助晶体塑性理论，通过ABAQUS/UMAT用户子程序的二次开发，实现了基于位错运动的塑性本构描述。通过晶体塑性有限元模拟，研究了单向拉伸过程中，晶体旋转及晶粒取向对变形结果的影响，获得了晶体旋转角度与应变的对应关系，晶粒初始取向对滑移启动及变形程度的影响规律；模拟结果与Schmid定律一致，验证开发的晶体塑性模型的正确性。
차조정체소성이론，통과ABAQUS/UMAT용호자정서적이차개발，실현료기우위착운동적소성본구묘술。통과정체소성유한원모의，연구료단향랍신과정중，정체선전급정립취향대변형결과적영향，획득료정체선전각도여응변적대응관계，정립초시취향대활이계동급변형정도적영향규률；모의결과여Schmid정률일치，험증개발적정체소성모형적정학성。
With the help of crystal plastic theory,a plactic constitutive description based on dislocation motion was obtained by means of the secondary development of ABAQUS/UMAT user subroutine. A crystal plactic finite ele-ment model was built,and the effect of crystal rotation and crystal orientation on deformation was studied during a face-centered cubic single crystal during uniaxial tension. The corresponding relationship between crystal rotation and strain,the influence law of the initial crystal orientation on slip system activation and macroscopic mechanical response,were obtained. The simulated result had better agreement with the Schmidˊs law,which verified the cor-rectness of the crystal plastic model.