Studies on Thermal Elasto-Plastic Problems (4th Report)
Studies on Thermal Elasto-Plastic Problems (4th Report)
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热弹塑性问题研究（第四次报告）
DOI：
10.2534/jjasnaoe1968.1979.146_383
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
H. Hasegawa
中科院分区：
文献类型：
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作者：
Y. Fujita;T. Nomoto;H. Hasegawa
圆柱壳环焊缝残余应力是在役管道结构应力腐蚀开裂的重要问题之一。近年来，日本对上述问题进行了大量的研究，众所周知，焊接圆筒的应力状态可能与平板对接焊缝的应力状态有很大的不同。这是因为不仅产生环向应力，而且产生轴向的弯曲应力。本文用Rayleigh-Ritz法对圆柱薄壳的轴对称热应力问题进行了一维热弹塑性分析。采用满足几何边界条件的挠度函数，即使在自由度较小的情况下，也能得到比有限元更精确的解。通过与实验结果的比较，证实了该分析方法的有效性和结果的可靠性。阐明了圆柱壳尺寸和焊接热输入对焊接变形和残余应力的影响。这种影响通过使用参数（Q/h）·β来描述。文中还给出了给定圆柱壳的挠度和残余应力估算图。
The residual stress due to circumferential welds in cylindrical shells is one of the most important problems concerning stress corrosion cracking in piping structures in service. Recently in Japan, many researches are carried out with regard to the above problems.It is well known that the state of stress in welded cylinder may be quite different from that in butt welds of flat plates. This is because not only hoop stress but also bending stress in the axial direction is produced. This bending stress is induced because radial displacement caused by circumferential shrinkage occurs.In this paper, one dimensional thermal elasto-plastic analysis using Rayleigh-Ritz method is applied to the axi-symmetric thermal stress problems of thin cylindrical shells. The adoption of deflection function which satisfies the geometrical boundary condition yields more accurate solution compared with that of FEM even in case of smaller degree of freedom.The following conclusions are obtained from this analysis. The effectiveness of this analytical method and reliability of its results are confirmed by comparison with the experimental results. The influence of size of cylindrical shells and welding heat input on welding deflections and residual stresses is clarified. This influence is described by the use of parameter (Q/h) ·β. The estimation chart of deflections and residual stresses for a given cylindrical shell is also presented.