Xu Xingyuan, Xie Liyang, Zhou Song, An Jinlan, Huang Yanqing, Liu Youcheng, Jin Lei
School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110004, China.
Key Laboratory of Fundamental Science for National Defense of Aeronautical Digital Manufacturing Process, Shenyang Aerospace University, Shenyang 110136, China.
Materials (Basel). 2023 Jun 30;16(13):4751. doi: 10.3390/ma16134751.
Welding is prone to several defects. To test the fatigue properties of the welded defective joints of high-speed rail bogies, SMA490BW steel cruciform welded joints were employed with artificial defects treatment. Consequently, fatigue tests were conducted on the specimens. Fatigue fracture morphology was studied via scanning electron microscopy. The ABAQUS (version 2022) finite element software was used to calculate the stress distribution and concentration factor of cruciform welded joints with defects. The results show that the fatigue limits of 1 and 2.4 mm defect specimens were approximately 57.2 and 53.75 Mpa, respectively. Furthermore, the stress concentration factor of no, 1 mm, and 2.4 mm defects were 2.246, 4.441, and 6.684, respectively, indicating that the stress concentration factor of 1 and 2.4 mm defects increased by 98 and 198%, respectively, with respect to the no-defect case.
焊接容易出现多种缺陷。为测试高铁转向架焊接缺陷接头的疲劳性能，采用SMA490BW钢十字形焊接接头并进行人工缺陷处理。随后，对试样进行疲劳试验。通过扫描电子显微镜研究疲劳断口形貌。使用ABAQUS（2022版）有限元软件计算含缺陷十字形焊接接头的应力分布和应力集中系数。结果表明，1毫米和2.4毫米缺陷试样的疲劳极限分别约为57.2兆帕和53.75兆帕。此外，无缺陷、1毫米和2.4毫米缺陷的应力集中系数分别为2.246、4.441和6.684，这表明1毫米和2.4毫米缺陷的应力集中系数相对于无缺陷情况分别增加了98%和198%。
