FEM Study on the Stress Concentration Factors at Weld Toe of Butt-Welded Joints for High Strength Steel

doi:10.3969/j.issn.1674-0696.2016.02.04

Abstract

Abstract: The stress concentration factor (SCF) is one of the most important factors to evaluate the safety of structures. According to the thereto-effect of welding process, the nonlinear changes of material properties were considered, the residual stress distribution was analyzed and compared with the experimental results. Furthermore, different weld geometric parameters were considered and the effects of them on SCFs were discussed. Research indicated: The influence of residual stress on stress concentration effect is evident when low stress is applied for RQT701 high-strength steel. And it is possible to decrease the stress concentration factor of butt-welded joint by decreasing weld bead flank angle or/and increasing the weld toe radius,and the SCFs increase with the augment of plate thickness.

Key words: bridge engineering, high strength steel, welding, stress concentration factors(SCF), residual stress, geometric parameter

摘要： 基于热弹-塑性理论，建立了RQT701高强钢对接接头焊接残余应力有限元分析模型，在此基础上计算了其焊接残余应力，并与实测值进行了比较。同时讨论了焊缝几何参数对对接接头焊趾处应力集中系数(SCF)的影响。研究结果表明：RQT701高强钢对接接头中残余应力对应力集中系数的影响较大，尤其是在低应力情况下受应力水平变动影响较大；减小焊趾倾角，增大过渡圆弧半径，可以减缓焊趾处截面形状的变化，显著改善接头焊趾处的应力集中；随着板厚的增加应力集中系数随之增大。

关键词: 桥梁工程, 高强钢, 焊接, 应力集中系数, 残余应力, 几何参数

CLC Number:

JIANG Yong, QIAN Ji, CHEN Weizhen. FEM Study on the Stress Concentration Factors at Weld Toe of Butt-Welded Joints for High Strength Steel[J]. Journal of Chongqing Jiaotong University(Natural Science), 2016, 35(2): 13-16.

蒋永, 钱骥，陈惟珍. 高强钢对接接头焊趾应力集中系数有限元分析[J]. 重庆交通大学学报（自然科学版）, 2016, 35(2): 13-16.

References

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 ［9］李栋才，曹历杰.对接接头应力集中系数的有限元分析［J］.西安石油学院学报，1997，12(1):30-34.
 LI Dongcai,CAO Lijie. Finite element analysis of stress concentration factor of butt welded joint［J］. Journal of Xi’an Petroleum Institute,1997,12(1): 30-34.
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 WANG Jianhua,ZHU Xianbo. Finite element analysis on stress concentration at weld toe of butt-welded joints［J］. Journal of Marine Technology,1982(3): 14-20.
 ［1］辛克贵，郭佳，何铭华.高强钢的应力强度因子分析［J］.清华大学学报 (自然科学版)，2010，50(12):1901-1905.
 XIN Kegui,GUO Jia,HE Minghua. Stress intensity factor of high strength steel［J］. Journal of Tsinghua University(Science and Technology),2010,50(12):1901-1905.
 ［2］白玉慧，陈喆，周水兴.T型管节点应力集中系数的数值分析［J］.重庆交通大学学报(自然科学版)，2009,28(6):998-999.
 BAI Yuhui，CHEN Zhe，ZHOU Shuixing. Numerical anaysis on stress concentration factors for tubular T-joints［J］. Journal of Chongqing Jiaotong University(Natural Science),2009,28(6): 998-999.
 ［3］ JIANG Jin,ZHAO Mingshan. Influence of residual stress on stress concentration factor for high strength steel welded joints［J］. Journal of Constructional Steel Research,2012(72): 20-28.
 ［4］ CAO Yuguang,MENG Zhanbin,ZHANG Shihua,et al. FEM study on the stress concentration factors of K-joints with welding residual stress［J］. Applied Ocean Research ,2013(43): 195-205.
 ［5］唐万民，刘小渝，王晓明. 钢构件对接焊焊缝横向残余应力分布研究［J］.重庆交通大学学报(自然科学版)， 2004,23(6):40-42.
 TANG Wanmin ,LIU Xiaoyu,WANG Xiaoming. Study of the distribution of the horizontal residual stress in the butt welded joint［J］. Journal of Chongqing Jiaotong University(Natural Science),2004,23(6): 40-42.
 ［6］ LEE C K,CHIEW S P,JIANG J. Residual stress study of welded high strength steel thin-walled plate-to-plate joints part 2: numerical modeling［J］. Thin-Walled Structures,2012(59): 120-131.
 ［7］ JAMES M N,WEBSTER P J,HUGHES D J,et al. Correlating weld process conditions,residual strain and stress,microstructure and mechanical properties for high strength steel—the role of neutron diffraction strain scanning［J］. Materials Science and Engineering: A,2006,427(1/2): 16-26.
 ［8］ GURNEY T R. Finite-element analyses of some joints with the welds transverse to the direction of stress［J］. Welding Research International,1976,6(4): 40- 72.
 ［9］李栋才，曹历杰.对接接头应力集中系数的有限元分析［J］.西安石油学院学报，1997，12(1):30-34.
 LI Dongcai,CAO Lijie. Finite element analysis of stress concentration factor of butt welded joint［J］. Journal of Xi’an Petroleum Institute,1997,12(1): 30-34.
 ［10］汪建华，朱贤博.焊接接头应力集中系数的有限元计算［J］.造船技术，1982(3):14-20.
 WANG Jianhua,ZHU Xianbo. Finite element analysis on stress concentration at weld toe of butt-welded joints［J］. Journal of Marine Technology,1982(3): 14-20.

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