摘要
利用高精度同步辐射X射线三维成像技术,对激光-电弧复合焊缝的气孔率进行测定,并将其作为GTN损伤模型中的初始孔洞体积分数。通过建立含余高与不含余高的复合焊接接头的细观损伤力学有限元模型,得到了拉伸接头主应力和孔洞体积分数的分布。通过对拉伸断口金相组织进行分析,发现了几何和材料的不连续性是导致接头失效的重要原因。
By the high resolution synchrotron radiation X-ray three-dimensional micro tomography technology, the porosity in laser-arc hybrid welds is characterized, which is taken as the initial void volume fraction in the GTN mesoscopic damage model. The finite element models of mesoscopic damage mechanics for hybrid welded joints with and without reinforcement are developed, and the principal stress and the void volume fraction distribution of tensile joints are obtained. Via the metallographic structure analysis of tensile fractures, it is shown that the geometrical and material discontinuity is the important reason for joint failure.
作者
段浩
吴圣川
徐忠伟
张志良
阚前华
康国政
付亚楠
Duan Hao Wu Shengchuan Xu Zhongwei Zhang Zhiliang Kan Qianhua Kang Guozheng Fu Yanan(State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China Department of Structural Engineering, Norwegian University of Science and Technology, Trondheim N 7491, Norway Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2016年第10期105-112,共8页
Chinese Journal of Lasers
基金
国家自然科学基金(11572267)
牵引动力国家重点实验室开放基金(2015TPL-T07
TPL1505)
