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首页> 外文期刊>Fatigue & Fracture of Engineering Materials & Structures >A residual stress dependent multiaxial fatigue life model of welded structures
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A residual stress dependent multiaxial fatigue life model of welded structures

机译：与残余应力有关的焊接结构多轴疲劳寿命模型

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摘要

In this paper, the influence of the residual stress on the fatigue performance of a welded structure under multiaxial loading modes is studied. First, the local stress state at weld toe is modified via introduction of the residual stress, and a new fatigue life estimation model considering the effect of the residual stress is established by modifying our recently proposed critical plane method. Second, the basic theory and procedure of the finite element simulation on the calculation of the welding residual stress are presented. Finally, a numerical simulation of an aluminum alloy flange-to-tube welding process is conducted, and the calculated residual stress is verified with X-ray diffraction measurement. Furthermore, the performance of the proposed fatigue life estimation model is verified by the experimental data obtained in the fatigue test under different loading modes. It confirms that the consideration of the residual stress is important, especially under the out-of-phase loading mode.
机译：本文研究了残余应力对多轴载荷模式下焊接结构疲劳性能的影响。首先，通过引入残余应力来修改焊趾处的局部应力状态，并通过修改我们最近提出的临界平面方法来建立考虑残余应力影响的新疲劳寿命估计模型。其次，介绍了计算焊接残余应力的有限元模拟的基本理论和过程。最后，对铝合金法兰-管焊接工艺进行了数值模拟，并通过X射线衍射测量验证了计算出的残余应力。此外，通过疲劳试验在不同载荷模式下获得的实验数据验证了所提出的疲劳寿命估算模型的性能。它证实了考虑残余应力的重要性，特别是在异相加载模式下。

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  • 作者

    Z.C.Liu; C.Jiang; B.C.Li; X.G. Wang;

  • 作者单位

    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, 410082 Changsha, China;

    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, 410082 Changsha, China;

    Faculty of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka-shi, Fukuoka 819-0395, Japan;

    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, 410082 Changsha, China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    critical plane method; fatigue life estimation; residual stress; welded structure;

    机译：临界平面法疲劳寿命估算;残余应力焊接结构;

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