摘要
在高应力比R=0．5加载条件下采用T型管接头形式进行焊态、承载和非承载超声冲击处理试件的疲劳对比试验。试验结果表明:①在高应力比R=0．5加载条件下,管接头承受静载后再使用超声冲击方法对其进行处理仍然能够大幅度地延长焊接管接点的疲劳性能。②在承载超声冲击处理条件下,20钢T型管接头的疲劳强度(应力比R=0．5)提高了66％,疲劳寿命延长了3．8～4．0倍。③使用承载超声冲击处理这种工艺方法不仅可以在低中应力水平、中长寿命范围内改善焊接管接头的疲劳性能,也可以在高应力范围内改善其疲劳性能。这种工艺方法在一定程度上克服了承载前超声冲击方法对焊接接头疲劳性能改善程度在高应力区域内大幅度降低的缺点。
Under the loading condition Of high stress ratio R=0.5, contrast fatigue tests of tubular T-joints are carried out. Specimens are divided into three groups： as welded, treated by loading ultrasonic peening and unloading ultrasonic peening. Testing results show that： ① Under the loading condition of high stress ratio R=0.5, the fatigue performance of tubular joints can still be significantly improved by ultrasonic peening when after static loading. ② After treated by loading ultrasonic peening, the fatigue strength （stress ratio R=0.5） of 20 steel tubular T-joints is increased by 66%, and the fatigue life is prolonged by 3.8-4.0 times. ③ The fatigue performance of welded tubular joints can be improved by loading ultrasonic peening not only in low stress, medium-long life range, but also in high stress range. The problem that fatigue performance of welded joints in high stress range declines significantly by loading ultrasonic peening, can be solved by this technique to some extent.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2006年第5期144-148,共5页
Journal of Mechanical Engineering
基金
国家自然科学基金资助项目(50405019)。
关键词
承载超声冲击
管接头
疲劳性能
低碳钢
Loading ultrasonic peening
Tubular joint
Fatigue performance
Low carbon steel
