摘要
该文基于微观断裂力学的方法,针对Q460钢材角焊缝搭接接头的断裂行为进行了研究。分别通过对接焊缝试件的静力拉伸试验得到了焊缝材料的本构关系,11个开圆弧形平滑槽圆形截面拉伸试件标定了焊缝材料微孔扩张模型VGM和应力修正临界应变模型SMCS的断裂参量η、α,5个正面角焊缝搭接接头拉伸试验获得了焊接接头的荷载-变形曲线并进行了数值模拟。试验结果表明,E55-D2型焊材的角焊缝搭接接头拉伸破坏形式呈延性破坏。断裂参量结果分析表明,焊材的化学成分会导致焊缝金属断裂性能的差异。该文研究成果为焊缝材料建立了准确的数值模型,同时为高强度钢材焊缝的设计和焊接结构的破坏预测提供了一种有效的方法。
Based on the micro fracture mechanics, Q460 steel fillet welded joints were tested to study their fracture behavior. The constitutive relationship of weld metal materials were obtained through tension coupon tests. 11 smooth notch section tension specimens were used to calibrate toughness parameters of the void growth model（VGM） and the stress modified critical strain（SMCS） model η, α. A group of 5 fillet welded joints were tested to attain the load-deformation curves, which were simulated using the numerical method. The results of experimental study show that the fracture mode of lapped joints welded with E55-D2 weld metal was plastic. The analysis of the fracture parameters indicates that the chemical composition of welding materials will lead to differences in the fracture behaviour of the weld metals. In conclusion, an accurate numerical model for weld metal is developed and a reliable method is provided for the design of high strength steel welds and for the failure prediction of welded structures.
作者
施刚
陈玉峰
SHI Gang CHEN Yu-feng(Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil Engineering, Tsinghua University, Beijing 100084, China)
出处
《工程力学》
EI
CSCD
北大核心
2017年第4期13-21,共9页
Engineering Mechanics
基金
国家自然科学基金项目(51478244)
国家自然科学基金优秀青年基金项目(51522806)
关键词
高强度钢材
角焊缝
微观机理
断裂参量
延性断裂
high strength steel
fillet weld
micro-mechanics
fracture parameter
ductile fracture
