摘要
某轨道车辆的一个横向减振器座的焊缝在服役过程中出现了疲劳裂纹.为了找到疲劳开裂的原因,在获得疲劳载荷谱的情况下,分别采用名义应力法、热点应力法以及结构应力法对开裂焊缝进行了疲劳寿命数值仿真计算.数值仿真计算的结果表明,与名义应力和热点应力法相比较,结构应力法的计算结果最符合实际情况,且在焊缝应力集中的识别能力上,结构应力法也明显优于其它两种方法.结合具体的工程实例,进一步讨论了3种方法的本质差异,得出在焊接结构抗疲劳设计的过程中,结构应力法最值得在应用中普遍推广.
Fatigue cracks appeared in a weld on a transverse shock absorber seat of a railway vehicle during service. By using the fatigue load spectrum, the numerical simulation calculation of fatigue life of cracked welds is carried out by using the nominal stress, hot spot stress and structural stress method respectively. The numerical simulation results show that, the calculation results of the structural stress method are the most consistent with the engineering practice compared with the nominal stress method and the hot spot stress method, and the structural stress method is also obviously better than the other two methods in the identification ability of the stress concentration.Combined with this specific engineering example, this paper further discusses the essential differences of these three methods, and puts forwards a concluding opinion, that is, the structural stress method is most worthy of being popularized in application in the process of anti-fatigue design of welded structures.
作者
陈秉智
何正平
李向伟
兆文忠
CHEN Bingzhi;HE Zhengping;LI Xiangwei;ZHAO Wenzhong(Dalian Jiaotong University,Dalian,116028,China;CRRC QIQIHAR Co.,Ltd.,Qiqihar,161000,China)
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2022年第5期63-68,I0007,共7页
Transactions of The China Welding Institution
基金
国家高速列车青岛技术创新中心资助项目(CXKY-02-08(2019))
辽宁省高等学校创新团队支持计划(LT2006010)
大连市科技创新基金资助项目(2019J11CY017).
关键词
焊缝开裂
疲劳寿命预测
名义应力法
热点应力法
结构应力法
weld cracking
fatigue life prediction
nominal stress method
hot spot stress method
structural stress method
作者简介
第一作者:陈秉智,博士,教授,博士研究生导师,主要从事计算力学与轨道车辆焊接结构疲劳性能评估方面的研究与教学.Email:chenbingzhi06@126.com.
