基于Lemaitre韧性断裂准则的1060铝板成形极限研究

Study on forming limit of aluminum sheet 1060 based on the lemaitre ductile fracture criterion

针对成形极限曲线的测定需建立在大量实验基础上,耗时耗材,且需要特定的成形实验机才能完成的不足,采用韧性断裂准则与数值模拟相结合来预测。建立测定成形极限曲线的有限元分析模型,对不同尺寸1060铝板试样成形过程进行数值模拟与分析,并采用Lemaitre韧性断裂准则作为板料破裂与否的判据,找出破裂极限应变值,拟合成形极限曲线;为验证提出方法的正确性,采用实验方法制作1060铝板成形极限曲线,并将其与模拟得到的曲线进行对比,两曲线走向基本一致,有较好的吻合度,表明该方法能够应用于成形极限曲线的预测。

It was wasting time and energy to conduct a large number of experiments for establishing the forming limit curves by the particular forming machine.For the above problems,the forming limit curve could be predicted by combing the ductile fracture criterion and numerical simulation.Then,3D finite element analysis model was built,and the forming processes of aluminum sheet 1060 with different sizes were simulated and analyzed,and the limit strain of fracture was found by the lemaitre ductile fracture criterion,and the forming limit curve was fitted.In order to verify the correctness of the proposed method,the forming limit curve of aluminum sheet 1060 was made by the experimental method.Furthermore,compared with the curves,they had a good fit for the basic consistency.Thus,the result indicates that the method can be applied to predict the forming limit curve.