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Observation of necking and fracture behavior of sheet metal in bore expanding test

机译：扩孔试验中钣金颈缩和断裂行为的观察

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A number of ductile fracture criteria have been proposed and verified their availabilities bymany researchers. Oyane's ductile fracture criterion with two material parameters is well-knownas one of the most accurate prediction criterion. To determine material parameters, destructivetests have to be operated in two different deformation states. For sheet metals, uniaxial and planestraintensile test have been adopted in the method. However, preparation of test specimens, testingmachines and test procedure are troublesome. To solve this issue, we proposed a determinationmethod of ductile fracture material parameters of metal sheets using bore expanding test and finiteelement (FE) simulation by focusing on the difference of forming limits with different bore sizes.However, mathematical discussion on determining two fracture material parameters is not enoughand its further revalidation should be verified. In this paper, to confirm the validity of this method,observation of necking initiation and its evolution in bore expanding process is carried out by usinglaser micro scope. As a result, it is observed that the necking and fracture behavior in the boreexpanding test is different in two test blanks of different bore diameters.
机译：已经提出了许多韧性断裂标准，并由许多研究人员验证了它们的可用性。 Oyane具有两个材料参数的韧性断裂准则是众所周知的最准确的预测准则之一。为了确定材料参数，必须在两种不同的变形状态下进行破坏性测试。对于金属薄板，该方法已采用单轴和平面拉伸试验。然而，试样的准备，测试机器和测试程序是麻烦的。为了解决这个问题，我们通过扩孔试验和有限元（FE）模拟，提出了一种确定金属延性断裂材料参数的方法，着眼于不同孔径的成形极限的差异。然而，关于确定两个断裂材料参数的数学讨论还不够，应进一步验证其有效性。为了证实该方法的有效性，利用激光显微仪对缩颈的产生及其在扩孔过程中的演变进行了观察。结果，观察到扩孔试验中的颈缩和断裂行为在具有不同孔径的两个试验坯料中是不同的。

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