Q345/316L异种焊接接头的疲劳裂纹扩展速率研究
A Study on Fatigue Crack Growth Rate of Q345/316L Dissimilar Welded Joint
郭逸轩 1王泽溪1
作者信息
- 1. 长安大学 工程机械学院,西安 710064
- 折叠
摘要
采用钨极惰性气体保护焊焊接Q345 和 316L钢板,并在接头不同区域处制备紧凑拉伸试样.通过疲劳裂纹扩展试验,采用柔度法原理得到裂纹长度和循环周次的关系,并绘制裂纹扩展速率和应力强度因子范围之间的关系曲线图,通过曲线拟合得到焊接接头各区域的Paris公式.结果表明:在裂纹扩展前期,各区域的疲劳裂纹扩展速率差异比较明显,Q345 和 316L母材的扩展速率最快,两侧热影响区焊缝的扩展速率最慢;在裂纹扩展后期,各区域的疲劳裂纹扩展速率大致相同.
Abstract
The Q345 and 316L steel plates were welded by tungsten inert gas welding and compact tensile specimens were prepared at different areas of the joint.Through fatigue crack growth test,the relationship between crack length and cycle times was obtained by using the principle of flexibility method,and the relationship curve between crack growth rate and stress intensity factor range was drawn.Paris formula for each region of the welded joint was obtained by curve fitting.The results show that in the early stage of crack growth,the fatigue crack growth rates of different regions are different,and the growth rates of Q345 and 316L base materials are the fastest.The expansion rate of welds in heat-affected zone on both sides is the slowest.In the late stage of crack growth,the fatigue crack growth rate of each region is roughly the same.
关键词
焊接接头/疲劳裂纹/扩展速率/曲线拟合Key words
welding joint/fatigue crack/expansion rate/curve fitting引用本文复制引用
出版年
2024
NETL
NSTL
万方数据