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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。
For the determination of forming limit curve to be established on the basis of a large number of experiments, time-consuming supplies, and require a specific forming machine to complete the deficiencies, the use of toughness fracture criterion and numerical simulation to predict. The finite element analysis model of the forming limit curve was established. The forming process of the 1060 aluminum plate samples with different sizes was numerically simulated and analyzed. The Lemaitre ductile fracture criterion was used as the criterion of the plate rupture or not, and the rupture limit strain value was found. In order to verify the correctness of the proposed method, the forming limit curve of 1060 aluminum plate was made by experimental method, and compared with the curve obtained by simulation, the two curves are basically the same, with good agreement, indicating that the method It can be applied to the prediction of forming limit curve.