CAJ | 학술논문

介绍单晶体模型的2种实现方法,并通过对有限元软件ABAQUS/Explicit的用户材料接口VUMAT做二次开发,实现2种单晶体模型构架和显式有限元方法的耦合.采取实体单元来存储材料信息,每个单元代表一个晶粒,在每个增量步中读取并更新晶粒取向.采用切线系数法来计算每个增量步中不同变形系统的塑性应变增量,通过硬化模型来描述硬化响应.利用编制的2种用户子程序模拟铜(FCC)单向拉伸过程、IF铁(BCC)冷轧过程和AZ31镁合金(HCP)单向压缩过程中的织构演化,模拟结果和试验结果吻合较好.
개소단정체모형적2충실현방법,병통과대유한원연건ABAQUS/Explicit적용호재료접구VUMAT주이차개발,실현2충단정체모형구가화현식유한원방법적우합.채취실체단원래존저재료신식,매개단원대표일개정립,재매개증량보중독취병경신정립취향.채용절선계수법래계산매개증량보중불동변형계통적소성응변증량,통과경화모형래묘술경화향응.이용편제적2충용호자정서모의동(FCC)단향랍신과정、IF철(BCC)랭알과정화AZ31미합금(HCP)단향압축과정중적직구연화,모의결과화시험결과문합교호.
Two alternative formulations of single crystal plasticity model were introduced respectively and two schemes were implemented in the explicit FE code with software ABAQUS/Explicit by writing the user subroutine VUMAT.Meshes containing material data were created with solid elements.Each element represented an individual grain,and the grain orientations were explicitly stored and updated at each increment.Tangential modulus method was employed to calculate the plastic shear strain increment of deformation systems in combination with a hardening law to describe the hardening responses.Both two developed subroutines were applied to simulate the texture evolution during the uniaxial tension of copper (FCC),cold rolling of IF steel (BCC) and uniaxial compression of AZ31 magnesium alloy (HCP).The predicted texture distributions are in qualitative agreement with the experimental results.