2219铝合金VPTIG焊缝CTOD裂纹扩展阻力曲线研究  

CTOD crack propagation resistance curve of 2219 aluminium alloy VPTIG weld

作　　者：田志杰 张玉芝 董康英 马小玉 许可 TIAN Zhijie;ZHANG Yuzhi;DONG Kangying;MA Xiaoyu;XU Ke(Capital Aerospace Machinery Company,Beijing 100076,China)

机构地区：[1]首都航天机械有限公司,北京100076

出　　处：《兵器材料科学与工程》2018年第4期31-34,共4页Ordnance Material Science and Engineering

基　　金：国防基础科研资助项目(JCKY2014203A001);民用航天预研资助项目(科工一司[2014]618号)

摘　　要：针对2219铝合金低匹配VPTIG焊缝裂纹扩展阻力的问题,以裂纹尖端张开位移(CTOD)为表征参量,开展焊接接头断裂韧性试验,绘制裂纹扩展阻力曲线。结果表明:2219铝合金VPTIG焊缝断裂属于弹塑性断裂,断口扩展区是韧窝为主的微观断裂;焊缝在(0.13~0.56)mm裂纹扩展过程中,表现出良好的断裂韧性,铝合金TIG焊缝内裂纹扩展阻力变化不大。经试验与计算,焊缝δ0.2BL值为0.087 mm。According to the problem of the crack propagation resistance for under-matched 2219 Al VPTIG weld,the fracture toughness test of weld was carried out with crack tip opening displacement（CTOD）as characteristic parameter,and the crack propagation resistance curve（R-curve）was drawn. The results show that,for 2219 Al VPTIG weld,the failure pattern is an elastic-plastic fracture with crack propagation zone of microscopic fracture based on dimple. The weld metal exhibits excellent fracture toughness with crack propagation from 0.13 mm to 0.56 mm,and the magnitude of crack growth resistance for 2219 Al alloy TIG joints changes unclearly. By test and calculation,the weld δ0.2 BLvalue is 0.087 mm.

关 键 词：2219铝合金 VPTIG CTOD 阻力曲线 SEM 

分 类 号：TG442[金属学及工艺—焊接] O39[理学—工程力学]