转向架用SMA490BW钢不同焊接区域裂纹扩展速率
Crack growth rate of SMA490BW steel in different welding areas for bogie
回丽 1金磊 2宋万万 3周松 2安金岚1
作者信息
- 1. 沈阳航空航天大学 航空制造工艺数字化国防重点学科实验室,沈阳 110136
- 2. 沈阳航空航天大学 机电工程学院,沈阳 110136
- 3. 沈阳飞机工业(集团)有限公司,沈阳 110034
- 折叠
摘要
研究了高速列车转向架用SMA490BW钢对接焊在不同应力比和不同焊接区域下的裂纹扩展速率,分析了SMA490BW钢焊接接头不同焊接区域和不同应力比下的疲劳裂纹扩展行为.结果表明:在相同应力比下,SMA490BW钢不同焊接区域(焊核区、热影响区)对裂纹扩展速率的影响不大;应力比对裂纹扩展速率的影响较大;在相同应力强度因子下,应力比R=-1时的裂纹扩展速率明显高于R=0时的裂纹扩展速率;应力比对Paris公式里的c参数的影响较大,对m参数的影响较小.
Abstract
The fatigue crack growth behavior of SMA490BW steel welded joints for high-speed train bogies under different stress ratios in different welding areas was studied,and the microstructure and fracture morphology of the welded areas were characterized by optical microscope and scanning electron microscope.The results show that under the same stress ratio,the different welding areas(weld nugget zone,heat affected zone)of SMA490BW steel have little effect on the crack growth rate.The stress ratio has a greater influence on the crack growth rate.Under the same stress intensity factor,the crack growth rate at R=-1 is significantly higher than that at R=0;the stress ratio has a greater influence on the c parameter in the Paris formula and less on the m parameter.
关键词
机械工程/SMA490BW钢/焊接接头/裂纹扩展速率/应力强度因子Key words
mechanical engineering/SMA490BW steel/welded joint/crack growth rate/stress intensity factor引用本文复制引用
基金项目
国家自然科学基金项目(52105157)
辽宁省教育厅系列项目(LJKZ0194)
国防重点实验室开放基金项目(SHSYS202003)
出版年
2024
NETL
NSTL
万方数据