中国机械工程
中國機械工程
중국궤계공정
CHINA MECHANICAl ENGINEERING
2012年
6期
733-738
,共6页
强度失配%焊接接头%弹塑性变形%有限元法
彊度失配%銲接接頭%彈塑性變形%有限元法
강도실배%한접접두%탄소성변형%유한원법
strength mis -- matching%welded joint%elastic -- plastic deformation%finite element method
采用有限元方法对平面应变条件下含裂纹不同强度失配的平板拉伸焊接接头的弹塑性变形进行了分析,研究了焊缝与母材强度失配系数、焊缝硬化性能、裂纹长度等对接头塑性变形的影响。结果表明:强度失配系数对接头塑性变形有显著影响。低匹配时,变形首先集中在焊缝中,而高匹配则对焊缝起到了一定的保护作用。失配系数一定时,不同焊缝硬化性能接头的塑性变形发展趋势是一致的;但当外载较大时,局部塑性变形程度不同,焊缝的硬化性能降低,裂尖塑性变形增大。
採用有限元方法對平麵應變條件下含裂紋不同彊度失配的平闆拉伸銲接接頭的彈塑性變形進行瞭分析,研究瞭銲縫與母材彊度失配繫數、銲縫硬化性能、裂紋長度等對接頭塑性變形的影響。結果錶明:彊度失配繫數對接頭塑性變形有顯著影響。低匹配時,變形首先集中在銲縫中,而高匹配則對銲縫起到瞭一定的保護作用。失配繫數一定時,不同銲縫硬化性能接頭的塑性變形髮展趨勢是一緻的;但噹外載較大時,跼部塑性變形程度不同,銲縫的硬化性能降低,裂尖塑性變形增大。
채용유한원방법대평면응변조건하함렬문불동강도실배적평판랍신한접접두적탄소성변형진행료분석,연구료한봉여모재강도실배계수、한봉경화성능、렬문장도등대접두소성변형적영향。결과표명:강도실배계수대접두소성변형유현저영향。저필배시,변형수선집중재한봉중,이고필배칙대한봉기도료일정적보호작용。실배계수일정시,불동한봉경화성능접두적소성변형발전추세시일치적;단당외재교대시,국부소성변형정도불동,한봉적경화성능강저,렬첨소성변형증대。
Elastic--plastic deformation behaviors of strength mis--matched welded joints with cracks were investigated using finite element method. Effects of strength mis--matching, hardening property of weld metal and crack length on plastic deformation were analyzed. The results show that strength mis--matching has significant influence on plastic deformation of welded joint. Deformation is first concentrated in weld for under-- matched joint, while for over-- matched joint, strength over-- matching can protect weld metal to some extent. When strength mis--matching facor is constant, the plastic deformation trends for welded joints with different hardening properties of weld metals are similar,whereas local plastic deformation levels are different. Plastic deformation increases with the hardening property of weld metal decreasing.