防松帽搭接焊缝力学性能及分区建模方法  

Research on Mechanical Properties of Locking Cap Lap Welds and Partitioned Seam Weld Model

作　　者：金雪[1] 朱平[1] 李晗[1] 王庆[1] 

机构地区：[1]上海交通大学机械系统与振动国家重点实验室,上海市复杂薄板结构数字化制造重点实验室,上海200240

出　　处：《上海交通大学学报》2017年第11期1297-1303,共7页Journal of Shanghai Jiaotong University

摘　　要：为了建立精细有限元模型,提高焊缝疲劳寿命仿真预测精度,需准确获取焊缝区的组织及材料力学性能分布.通过金相试验得到了焊缝区域组织分布,结合硬度试验和经验公式获取了焊缝微小区域组织应力-应变曲线参数.根据试验结果分析提出一种焊缝分区建模方法,并利用准静态拉伸试验验证了该方法的正确性,为进一步分析焊缝区域失效机制以及预测疲劳寿命奠定了基础.Locking caps are widely-used components in large engineering projects such as nuclear reactors and mining machines. In order to improve the precision of weld FE model and fatigue life prediction, it is required to obtain accurate microstructure and mechanical properties of the weld zone. In this research, the microstructure performance was studied by metallography, combined with hardness test and empirical for- mula to obtain stress-strain parameters of small regional organizations of the weld. Based on this, a parti- tioned seam weld modeling method was developed. The method was verified by quasi-static tensile test and lays the foundation for further analysis of failure mechanism and fatigue life prediction of weld zone.

关 键 词：防松帽 焊缝组织 力学性能 分区建模 

分 类 号：TG407[金属学及工艺—焊接]