Numerical studies of welding residual stresses in tubular joints and experimental validations by means of x-ray and neutron diffraction analysis
Numerical studies of welding residual stresses in tubular joints and experimental validations by means of x-ray and neutron diffraction analysis
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DOI：
10.1016/j.matdes.2017.03.088
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发表时间：
2017-07-15
影响因子：
8.4
通讯作者：
Boin, Mirko
中科院分区：
文献类型：
--
作者：
Hemmesi, Kimiya;Farajian, Majid;Boin, Mirko
残余应力对材料结构性能的影响对于准确评定焊接构件和结构的完整性是非常重要的。在缺乏关于残余应力大小和分布的可靠信息的情况下，通常认为残余应力与材料的屈服强度一样高，这可能导致失效评估中的过度保守，从而导致经济问题。因此，对焊接残余应力的确定提出了更真实、更可靠的要求。本文利用商业软件SYSWELD，采用有限元方法计算了S355J2H钢管材的焊接残余应力。为了与数值计算结果相比较，用X射线衍射仪和中子衍射仪(X射线衍射仪和中子衍射仪)分别测定了材料表面和本体三个方向上的残余应力分布。将数值计算结果与实测值直接进行了比较。总体目标是评估有限元方法在准确计算用于完整性评估的残余应力状态方面的使用。
The influence of residual stresses on the structural behavior of the material is of high importance for accurate integrity assessment of welded components and structures. In the absence of reliable information on magnitude and distribution of residual stresses, it is generally assumed that residual stresses are as high as the yield strength of the material which could lead to over-conservatism in the failure assessment and consequently economic problems. Accordingly, a growing need to the more realistic and reliable determination of welding residual stresses has been raised.In this paper finite element approach is applied in order to calculate the welding residual stresses in a tube out of S355J2H steel using the commercial software package SYSWELD. For comparison with the numerical investigations x-ray and neutron diffraction measurements (XRD and ND) are carried out to determine the distribution of residual stresses in three orthogonal directions, on the surface and in the bulk of the material respectively. The numerical results are compared directly with the measured data. The overall aim is to evaluate the use of finite element approach in the accurate calculation of residual stress states for use in the integrity assessments.