5083铝合金GTN损伤参数求解与成形极限预测  

GTN damage parameter calculation and forming limit predictionof 5083 aluminum alloy

作　　者：刘纯国[1,2] 王廖子 姚作杨 LIU Chunguo;WANG Liaozi;YAO Zuoyang(Roll-Forging Research Institute,Jilin University,Changchun 130022,China;School of Materials Science and Engineering,Jilin University,Changchun 130022,China)

机构地区：[1]吉林大学辊锻工艺研究所,吉林长春130022 [2]吉林大学材料科学与工程学院,吉林长春130022

出　　处：《中南大学学报（自然科学版）》2023年第11期4315-4325,共11页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51975248)。

摘　　要：GTN(Gurson-Tvergaard-Needleman)损伤模型被广泛用于预测金属的韧性断裂,但损伤参数多且求解困难,限制了其实际应用。以5083铝合金为研究对象,通过扫描电镜观察不同变形阶段拉伸试样的孔洞体积占比确定GTN损伤参数的取值范围;借助中心复合实验设计方法构造拉伸曲线关键变量与GTN损伤参数的响应曲面模型,应用NSGA-II遗传算法优化铝合金板料的损伤参数;将优化后的GTN损伤参数应用于有限元分析中,利用数值模拟方法预测5083铝合金的成形极限图(FLD),并通过Nakazima试验测得铝合金板料的FLD,与数值模拟结果进行对比分析。研究结果表明:GTN损伤模型预测的FLD与实验结果的相对误差在10%以内,且拉压变形区域的预测精度高于双拉变形区域的预测精度。GTN damage model has been widely used in ductile metal fracture prediction.However,due to the large number of damage parameters and the difficulty in determining them,its practical application is limited.Using 5083 aluminum alloy as the research object.the value ranges of GTN damage parameters were determined by observing the pore volume ratio of tensile specimens at different deformation stages by scanning electron microscopy.A response surface model of the key variables of tensile curve and GTN damage parameters was constructed,and NSGA-II genetic algorithm was used to optimize the damage parameters of aluminum alloy sheet.The optimized GTN damage parameters were applied to the finite element analysis,and the forming limit diagram(FLD)of 5083 aluminum alloy was predicted by numerical simulation method.The FLD of aluminum alloy sheet was measured by Nakazima test and compared with the numerical simulation results.The results show that the relative error between the FLD predicted by GTN damage model and the experimental results is less than 10%,and the prediction accuracy of tensile-compression deformation area is higher than that of double tensile deformation area.

关 键 词：5083铝合金 GTN损伤模型 成形极限图 响应曲面法 

分 类 号：TG389[金属学及工艺—金属压力加工]