摘要
焊接结构中，焊接接头的疲劳强度远远低于母材的疲劳强度。大量的实验表明，疲劳裂纹主要起源于接头焊趾处，因此处理焊接接头焊趾将会提高接头的疲劳强度。文中利用自行研制的超声波冲击实验装置，对提高低碳钢焊接接头疲劳强度进行了研究。进行了Ｑ２３５Ｂ钢平板对接和十字接头（熔透）两种接头形式的焊态与冲击处理态的对比疲劳试验，分别获得了两种接头形式冲击处理前后的Ｓ—Ｎ 曲线及疲劳极限（２×１０６）。结果表明，超声冲击处理后，对接接头疲劳极限提高了５８％ ，十字接头提高了６４％ 。
Fatigue strength of welded joints in welded structures are much lower than that of base metals. Many experiments show that the fatigue crack mainly initiated at welded toes, so that the fatigue strength can be increased dramaticly by peening toe.In this paper,it was studied to improve the fatigue strength of welded joints and structrures of low carbon steel Q235B by peening the welded toes with ultrasonic equipment. The fatigue experiment of two kinds of joints (butt and cruciform joints)were carried out for both welded state and with peening treatment.The S—N curves and fatigue limits of both joints were obtained for both as welded and peened conditions,the fatigue strength of butt and cruciform joints have been increased by 58% and 64%,respectively.
出处
《机械强度》
CAS
CSCD
北大核心
1999年第4期289-291,共3页
Journal of Mechanical Strength
基金
国家自然科学基金
关键词
疲劳强度
超声冲击
低碳钢
焊趾
焊接接头
fatigue strength,ultrasonic peening,low carbon steel,welded joints
