以典型T型板为研究对象，通过顺序耦合的方法对其在不同约束边界下的焊接残余应力进行数值模拟，后将其作为结构的初始缺陷添加至疲劳分析模块中，完成了含有初始缺陷的典型T型板在不同载荷情况下的疲劳分析。结果表明：残余应力主要分布于焊缝及其附近区域，表现为接近材料拉伸极限的350 MPa左右的拉伸残余应力；理想状态下局部载荷对结构疲劳强度影响大于拉伸载荷，考虑残余应力后结构疲劳强度下降明显。
In this paper, the welding residual stress of typical T-shaped plates under different constraint boundaries is numerically simulated by sequential coupling method, and then it is added to the fatigue analysis module as the initial defect of the structure, and the fatigue analysis of typical T-shaped plates with initial defects under different loads is completed. The results show that the residual stress is mainly distributed in the weld and its adjacent area, which is about 350 MPa tensile residual stress close to the tensile limit of the material In the ideal state, the local load has a greater influence on the fatigue strength of the structure than the tensile load, and the fatigue strength of the structure decreases obviously after considering the residual stress.
2022,44(4): 1-5 收稿日期：2021-08-14
DOI：10.3404/j.issn.1672-7649.2022.04.001
分类号：U668.2
作者简介：王庆丰(1976-)，男，硕士，教授，研究方向为船舶结构设计与强度等
参考文献：
[1] D. 拉达伊. 焊接热效应温度场、残余应力、变形[M]. 北京: 机械工业出版社, 1997.
[2] 张龙. SUS304不锈钢板的胶接点焊及接头的疲劳强度[J]. 航空材料学报, 2020, 40(4): 77−84.
ZHANG Long, Adhesive spot welding of SUS304 stainless steel plate and fatigue strength of joint[J]. Journal of Aeronautical Materials, 2020, 40(4): 77−84.
[3] 王思源, 田雨. 断裂力学疲劳评估研究最新动向[J]. 中国船检, 2014, (8): 71−73.
WANG Si-yuan, TIAN Yu. Latest trend of fatigue assessment in fracture mechanics[J]. China Ship Survey, 2014, (8): 71−73.
[4] 卫星, 姜苏. 基于断裂力学的钢桥面肋-板接头疲劳寿命预测[J]. 西南交通大学学报, 2017, 52(1): 16–22
WEI Xing, JIANG Su. Fatigue life prediction of steel bridge deck rib-plate joint based on fracture mechanics[J]. Journal of Southwest Jiaotong University, 2017, 52(1): 16–22
[5] KARAN D, SUHAS V. Probabilistic fracture mechanics based fatigue evaluation of ship structural details. 2013, 61: 26−38.
[6] 闫志峰, 贺秀丽, 王文光, 等. 基于临界面法对AZ31B镁合金焊接接头疲劳评定[J]. 稀有金属材料与工程, 2014, 43(11): 2669−2674.
[7] 李标峰, 李敬勇. 铝镁合金焊接接头疲劳性能研究[J]. 舰船科学技术, 1995, (5): 44−55+67.
LI Biao-feng, LI Jing-yong. Study on fatigue properties of Al-Mg alloy welded joints. [J] Ship Science and Technology, 1995, (5): 44−55+67.
[8] 黎之奇, 柳舂图, 崔民子, 等. 海洋平台用钢的焊接疲劳性能分析[J]. 机械强度, 2000, (4): 264−266.
LI Zhi-qi, LIU Chong-tu, CUI Min-zi, et al. Analysis of welding fatigue performance of offshore platform steel[J]. Journal of Mechanical Strength, 2000, (4): 264−266.
