Fracture Analysis of Carbody Material 301L-DLT Cold-Rolled Stainless Steel Based on Finite Element

被引：0
|
作者：
Lu C. [1 ,2 ]
Cao Y. [1 ,2 ]
Huang J. [1 ,2 ]
Gao F. [1 ,2 ]
机构：
[1] Standards & Metrology Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing
[2] China Railway Test & Certification Center Limited, Beijing
来源：
Zhongguo Tiedao Kexue/China Railway Science | 2021年 / 42卷 / 05期
关键词：
Carbody material; Cold-rolled stainless steel; Ductile fracture; Stress state; Stress triaxiality;
D O I：
10.3969/j.issn.1001-4632.2021.05.17
中图分类号：
学科分类号：
摘要：
Taking 301L-DLT cold-rolled stainless steel, the main material for the carbody of railway vehicle, as the research object, three kinds of tensile fracture specimens with no notch, 2 mm and 4 mm notches were designed. The tensile fracture tests were carried out under different stress states and the fracture morphology was observed. Based on the test results, the finite element method was used to study the damage and fracture mechanism of 301L-DLT cold-rolled stainless steel under different stress states. The fracture models were established based on G-T-N (Gurson-Needleman-Tvergaard) and J-C (Johnson-Cook) fracture theories respectively. The fracture process was numerically simulated and the results were compared with those of tests. The results show that although the widths at the notches of specimens are the same, the fracture plastic strain of 301L-DLT cold-rolled stainless steel falls from 1.41 to 0.78 with the increase of stress triaxiality due to the different shapes of notches. The fracture models of 301L-DLT cold-rolled stainless steel based on G-T-N fracture theory and J-C fracture theory both can reproduce the ductile fracture process well, which provide a basis for accurately predicting the process of carbody collision fracture. © 2021, Editorial Department of China Railway Science. All right reserved.
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页码：146 / 154
页数：8
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