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应用NX Nastran有限元分析软件,对焊接接头拉伸试样进行应力集中分析,总结了试样过渡半径对应力集中的影响规律。结合塑性材料和脆性材料不同的断裂机理得出结论,应力集中对塑性材料焊接接头拉伸试验影响不大,对脆性材料影响显著,使试验结果偏低,是造成试样脆性断裂的主要原因。
The application of NX Nastran finite element analysis software to analyze the stress concentration of the welded joint tensile specimen and summarizes the influence law of the sample transition radius on the stress concentration. Based on the fracture mechanism of different plastic materials and brittle materials, it is concluded that the stress concentration has little effect on the tensile test of plastic welded joints, and has a significant impact on the brittle materials, resulting in low test results, which is the main reason for the brittle fracture of the samples.