摘要
结合损伤起始判据和损伤演化准则,建立了完整的韧性断裂准则,基于ABAQUS中韧性损伤材料模型对AZ31B镁合金板材成形极限进行了预测。通过拟合单向拉伸应力应变曲线得到材料本构模型及损伤演化参数,建立了板材的Nakazima半球形凸模胀形有限元仿真模型,再基于韧性断裂准则预测了AZ31B镁合金板材室温下的成形极限,并分析了不同板材断裂失效判据对成形极限的影响。研究结果表明,基于所建立的韧性断裂准则,并以损伤演化过程中应变路径转变作为断裂失效判据,可以较准确地预测镁合金板材成形极限,得到的成形极限图与实验结果吻合较好。
Combining the damage initiation criterion and the damage evolution criterion a complete ductile fracture criterion was established to predict the fracture failure of the sheet.The constitutive model and the damage evolution parameters were obtained by fitting the uniaxial tension stress-strain curve.The finite element model was established based on the Nakazima hemispherical punch bulging experiment and the ductile fracture criterion was used to predict the forming limit diagram FLD of AZ31B magnesium alloy at room temperature.The influence of the fracture failure criterion and strain path transition criterion on the prediction of forming limit diagram was discussed.The results indicated that by using the strain path transition during the damage evolution as the fracture failure criterion the predicted FLD is in good agreement with the experimental results.
作者
张瑞昭
孔博炜
崔忠冠
陈伟
任丽梅
ZHANG Ruizhao;KONG Bowei;CUI Zhongguan;CHEN Wei;REN Limei(Key Laboratory of Advanced Forging&Stamping Technology and Science Yanshan University Ministry of Education of China,Qinhuangdao,Hebei 066004 China;School of Mechanical Engineering Yanshan University,Qinhuangdao,Hebei,066004 China)
出处
《燕山大学学报》
北大核心
2024年第1期11-18,共8页
Journal of Yanshan University
基金
国家自然科学基金资助项目(51704262)
河北省自然科学基金资助项目(E2020203057)。
