缺陷锐度和方位对接头应力集中系数的影响  

Effects of Sharpness and Azimuth of Defects on Stress Concentration Factors in Welded Joint

作　　者：黄伟杰[1] 陈丽[1] 赵伟[1] 傅圣华 

机构地区：[1]福州大学至诚学院材料工程系,福建福州350002

出　　处：《热加工工艺》2015年第7期226-228,231,共4页Hot Working Technology

基　　金：国家级大学生创新创业训练计划项目(201313470006)

摘　　要：采用ANSYS有限元模拟软件,对焊缝中存在缺陷的焊接接头进行模拟研究,分析不同方位、不同大小的椭圆形气孔或裂纹对焊接接头应力集中系数的影响,并计算相应的应力集中系数。结果表明,当焊缝区存在椭圆形气孔或裂纹缺陷时,在其边缘区域将引起较大的应力集中,应力集中系数的大小与缺陷的锐度、尺寸大小及方位有关。缺陷尺寸越大,应力集中系数越大;缺陷偏离受力方向的角度越大,应力集中系数越大;椭圆气孔长轴与受力方向平行时,锐度越大,应力集中系数越小;椭圆气孔长轴与受力方向垂直时,锐度越大,应力集中系数越大。The welded joint with the defects was researched by finite element simulation software ANSYS. The effects of azimuths and sizes of elliptical hole or cracks on the stress concentration factors in welded joint were studied. The corresponding stress concentration factor was cal6ulated. The results indicate that when elliptical hole or crack defects appear in welding zone, the obvious stress concentration on the edge of the defect area, will take place and the stress concentration factor relates to the defect＇s sharpness, size and azimuth. The greater the defect size, the greater the stress concentration factor; larger the angle of defect deviation stress direction is, greater the stress concentration factor is.When the long axis of the elliptic hole is parallel to loading direction, the smaller the shm＇pness, the greater the stress concentration factor; when the long axis of the elliptic hole is in vertical stress direction, the greater the sharpness, the greater the stress concentration factor.

关 键 词：缺陷 接头 应力集中系数 有限元 

分 类 号：TG441.7[金属学及工艺—焊接]