冲击荷载下角焊缝动态强度试验研究  

Experimental Study of Dynamic Property of Transverse Fillet Weld

作　　者：陈英[1] 刘瑞娟[1] 霍静思[1] 

机构地区：[1]湖南大学教育部建筑安全与节能重点实验室,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2015年第3期31-35,共5页Journal of Hunan University:Natural Sciences

基　　金：国家自然科学基金资助项目(51078139);教育部新世纪优秀人才计划项目(NCET-11-0123)~~

摘　　要：对焊喉处受拉和受剪两种受力状态的角焊缝连接件进行动态拉伸试验,研究冲击荷载作用下受力状态对角焊缝破坏形态、断面角度、极限强度的影响规律.并通过与静态力学性能比较发现,动态冲击荷载作用下,角焊缝受拉和受剪极限强度均明显提高,即动态应变率效应显著;受拉角焊缝的破坏面角度均为45°,与静力试验结果(90°左右)有显著差异.角焊缝受拉下的应变率效应比受剪时明显,且角焊缝动态极限强度增大系数随应变率的影响规律与以往文献试验结果一致.Two different fillet weld connections and weld throat in tension and shear were tested under dynamic tensile load to study the influence of stress state under impact load on the failure mode,fracture angle and ultimate strength of fillet weld.Compared with the mechanical properties under a static load,the ultimate tension and shear strength increase significantly under a dynamic impact load,which shows obvious strain-rate effect.The dynamic fracture angles of the tensile fillet welds are 45°,which is quite different with static test results.The stain-rate effect of tension fillet weld is more apparent than that of shear fillet weld,and the influence of dynamic increase factor on ultimate strength of fillet weld is in accordance with test results of previous literatures.

关 键 词：冲击荷载 动态拉伸 极限强度 应变率 

分 类 号：TU392.4[建筑科学—结构工程]