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高组配焊接接头表面裂纹J积分试验研究
引用本文:李继红,张建勋,裴怡.高组配焊接接头表面裂纹J积分试验研究[J].焊接学报,2000,21(2):47-50.
作者姓名:李继红  张建勋  裴怡
作者单位:西安交通大学,西安,710049
基金项目:高等学校博士学科点专项科研项目,9569816,
摘    要:实际构件中大量存在着半穿型的焊接表面裂纹,对于这种力学性能不均匀三维裂纹体的弹塑性断裂力学参量的探讨还比较缺乏,利用J积分直接测试方法以及适当的理论弹性修正,对存在不同组配比的高组配焊接接头焊缝区的三维表面裂纹的J积分进行试验研究,着重讨论了接头组配比对焊接接头试样加载过程中裂纹扩展驱动力(J积分、裂纹嘴张开位移CMOD)、应变沿积分路径分布的影响。结果表明,焊接接头试样上应变的分布趋势取决于裂纹

关 键 词:焊接接头  表面裂纹  J积分  试验研究  高组配
收稿时间:1999/1/20 0:00:00

J-integral of Surface Crack in Overmatched Joint
LI Ji-hong,ZHANG Jian-xun and PEI Yi.J-integral of Surface Crack in Overmatched Joint[J].Transactions of The China Welding Institution,2000,21(2):47-50.
Authors:LI Ji-hong  ZHANG Jian-xun and PEI Yi
Affiliation:The Institute of Welding, Xi''an Jiaotong University, Xi''an, China,The Institute of Welding, Xi''an Jiaotong University, Xi''an, China and The Institute of Welding, Xi''an Jiaotong University, Xi''an, China
Abstract:The part through surface cracks exist widely in practical welded structure, and the investigation of the elastic plastic fracture mechanics parameters (eg. J integral) of this three dimensional mechanical heterogeneity is not enough. In this paper, the J integral of surface cracks in overmatched weldment with different matching ratios has been investigated by using direct evaluation method. The influences of matching ratio of joints on the crack driving force ( J integral, crack mouth opening displacement CMOD) and strain distributions along the contour have been discussed in detail. The results indicate that the comprehensive effect of crack position and the matching ratio of welded joint dominate the distribution of strain. With the increasing of load, the obvious strain concentration may be produced in the parent metal zone close to weld. Moreover, with the decreasing of the matching ratio, the degree of the strain concentration grows, the deformation of weld metal decreases to a certain extent, and the crack driving force increases.
Keywords:welded joint  surface crack  J    integral
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