STUDY ON DYNAMIC J-INTEGRAL OF MECHANICAL HETEROGENEOUS WELDED JOINT  

作　　者：F.Q.Tian D.Y.He X.Y.Li Y.W.Shi D.Zhang 

机构地区：[1]InstituteofCompositeMaterials,ShanghaiJiaotongUniversity,Shanghai200030,China [2]SchoolofMaterialsScienceandEngineering,BeijingPolytechnicUniversity,Beijing100022,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2004年第6期934-939,共6页金属学报（英文版）

基　　金：National Natural Science Foundation of China(No.59501011);Science and Technology New Star Project of Beijing.

摘　　要：Welded joint is a mechanical heterogeneous body, and mechanical heterogeneity has great effect on dynamic fracture behaviour of welded joints. In the present investigation, dynamic response curve and dynamic J-integral of practical undermatched welded joint and whole base and whole weld three-point-bend (TPB) models containing longitudinal crack are com- puted. Dynamic J-integral is evaluated using virtual crack extension (VCE) method and the computation is performed using MARC finite element code. Because of the effect of inertia, dynamic load response curve of computed model waves periodically. Dynamic J-integral evaluated by VCE method is path independent. The effect of inertia has little influence on dynamic J-integral curve. The value of dynamic J-integral of undermatched welded joint is lower than that of whole base metal and higher than that of whole weld metal. The results establish the foundation of safety evaluation for dynamic loaded welded structures.Welded joint is a mechanical heterogeneous body, and mechanical heterogeneity has great effect on dynamic fracture behaviour of welded joints. In the present investigation, dynamic response curve and dynamic J-integral of practical undermatched welded joint and whole base and whole weld three-point-bend (TPB) models containing longitudinal crack are com- puted. Dynamic J-integral is evaluated using virtual crack extension (VCE) method and the computation is performed using MARC finite element code. Because of the effect of inertia, dynamic load response curve of computed model waves periodically. Dynamic J-integral evaluated by VCE method is path independent. The effect of inertia has little influence on dynamic J-integral curve. The value of dynamic J-integral of undermatched welded joint is lower than that of whole base metal and higher than that of whole weld metal. The results establish the foundation of safety evaluation for dynamic loaded welded structures.

关 键 词：virtual crack extension welded joint dynamic response curve dynamic     J-integral 

分 类 号：TG407[金属学及工艺—焊接]