中国激光, 2016, 43 (10): 1002005, 网络出版: 2016-10-12
基于三维X射线成像和GTN模型的激光复合焊接7020铝合金的损伤机制
Damage Mechanism of Hybrid Welded 7020 Aluminium Alloy Based on Three-Dimensional X-Ray Micro-Tomography and GTN Model
激光技术 GTN细观损伤模型 激光-电弧复合焊接 7020铝合金 同步辐射X射线 疲劳损伤 laser technique GTN mesoscopic damage model laser-arc hybrid welding 7020 aluminum alloy synchrotron radiation X-ray fatigue damage
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。
Abstract
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.
段浩, 吴圣川, 徐忠伟, 张志良, 阚前华, 康国政, 付亚楠. 基于三维X射线成像和GTN模型的激光复合焊接7020铝合金的损伤机制[J]. 中国激光, 2016, 43(10): 1002005. Duan Hao, Wu Shengchuan, Xu Zhongwei, Zhang Zhiliang, Kan Qianhua, Kang Guozheng, Fu Yanan. Damage Mechanism of Hybrid Welded 7020 Aluminium Alloy Based on Three-Dimensional X-Ray Micro-Tomography and GTN Model[J]. Chinese Journal of Lasers, 2016, 43(10): 1002005.