摘要
利用自行开发的测量材料局部力学性能的双孔微剪切试验装置,对铝合金接头各区域进行微剪切试验。记录加载过程中的载荷位移曲线,同时通过金相显微镜实时观察受剪切材料的变形,裂纹的启裂、扩展、直至断裂。结合双孔微剪切试验的有限元模型的计算,得到对应材料发生裂纹开裂时的等效断裂应变。结果表明,焊缝断裂应变小于母材,在热影响区断裂应变随着距熔合线距离的增加而逐渐增大。
By means of the double hole microshear equipment to measure local mechanical properties,the microshear experiments were carried out within the various zones of the aluminum alloy welded joints.In the experiment the load displacement was instrumentally recorded,meanwhile,the deformation of material being measured,the initiation and propagation of the crack in the material,and the final fracture were observed by a microscope.Then,combining the calculations of finite element mode of double holes microshear and the load-displacement curve obtained from the test,the fracture strains for the crack initiation were estimated.The determination results show that the fracture strain in the welds is lower than that in the base metal,and the fracture strain in the HAZ gradually increases as position is further from the fusion line.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2008年第7期1-4,共4页
Transactions of The China Welding Institution
基金
国家重大基础研究前期研究资助项目(2004CCA04900)
关键词
局部断裂应变
双孔微剪切试验
铝合金焊接接头
local fracture strain
double-hole microshear test
welded joints in aluminum alloy
