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韧性断裂准则作为材料成形极限中的重要指标,对于准确预测金属内部和表面韧性破坏发生的时间和位置、工艺制定和模具设计具有重要的意义。以45钢为材料,采用不同形式的试件进行了拉伸、压缩、剪切、扭转等实验,并利用金属塑性成形模拟专业软件对实验过程进行数值模拟,对工程中广泛使用的11种韧性断裂准则进行分类对比研究。指出Normalized Cockroft & Latham和Brozzo断裂准则比较适用于高应力三轴度成形过程,而Ayada和Rice-Tracy断裂准则更适用于较低应力三轴度成形过程。
As an important index in the material forming limit, the ductile fracture criterion plays an important role in accurately predicting the time and location of metal internal and surface ductile damage. Taking 45 steel as material, experiments of tensile, compression, shear and torsion were carried out by using different types of specimens. The numerical simulation of the experimental process was carried out by using metal plastic forming simulation software. Eleven kinds of toughness Fracture criteria classification comparative study. It is pointed out that Normalized Cockroft & Latham and Brozzo fracture criterion are more suitable for high-stress triaxial forming, while Ayada and Rice-Tracy fracture criteria are more suitable for lower stress triaxial forming.