A method for analysis of residual welding stresses and deformations based on the inherent strain
A method for analysis of residual welding stresses and deformations based on the inherent strain
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基于固有应变的残余焊接应力和变形分析方法
DOI：
10.2207/qjjws1943.39.4_236
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发表时间：
1970
期刊：
影响因子：
--
通讯作者：
T. Fujimoto
中科院分区：
文献类型：
--
作者：
T. Fujimoto
提出了一种基于焊接接头沿着分布的固有应变分析焊接残余应力和变形的基本理论。本文的第一部分讨论了二维预应力问题的一般解，这是作者在以前的工作中提出的预应力理论的一个特例。在焊接结构中，固有应变通常产生在焊接接头周围的窄条区域内。因此，由于焊接残余应力的分析可以简化使用模型，其中固有应变被假定为分布在一条线上。在这种情况下，理想化固有应变的特性可以用分布的强度来表示。通过固有应变强度的纵向分量和横向分量引入焊接接头固有收缩的概念。第二部分讨论了板的二维固有应力问题与固有挠度问题的类比。通过引入与固有应变相对应的固有曲率，可直接从这一类比得到弹性板固有挠度的一般解。因此，固有焊接变形被定义为固有收缩和固有翘曲的组合。本文用纵向收缩、横向收缩、错边、纵向翘曲、横向翘曲和扭曲六个基本分量来表示焊接固有变形。在最后一部分中，给出了一个沿沿着接头的固有应变分布的例子。这是作者根据I。九州大学的Tsuji。
A fundamental theory for the analysis of residual welding stresses and deformations based on the inherent strain distributed along the welded joint is presented. The first part of this paper deals with a general solution to a two-dimensional inherent stress problem which is a special case of the inherent stress theory presented by the author in a previous work. In the welded structures, the inherent strain is commonly created within the narrow strip-like region which encloses a welded joint. Therefore, the analysis of residual stress due to welding can be simplified using a model in which the inherent strain is assumed to be distributed on a line. In this case, the characteristics of the idealized inherent strain may be expressed by the intensity of the distribution. The concept of the inherent shrinkage of welded joint is introduced through the longitudinal and transverse components of this intensity of the inherent strain.The second part is concerned with the analogy between the two-dimensional inherent stress problem and the inherent deflection problem of a plate. A general solution to the inherent deflection of an elastic plate is directly obtained from this analogy by introducing the inherent curvature corresponding to the inherent strain. The inherent welding deformation is therefore defined as the combination of the inherent shrinkage and the inherent warping. In this paper, the inherent welding deformation is represented by six basic components, i.e. longitudinal shrinkage, transverse shrinkage, staggering; longitudinal warping, transverse warping and twisting. They are schematically illustrated in Fig.7.In the last part, an example of the inherent strain distribution along a butt welded joint is presented. This was recalculated by the author from the theoretical results of thermo-elastoplastic analysis of transient welding stress carried out by Prof. I. Tsuji of Kyushu University.