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本文用三维有限元的方法研究带 30°斜接管的圆柱形容器在内压作用下的极限载荷 ,通过计算确定了容器的应力集中系数、塑性区的扩展情况以及容器的变形情况 ,并用两倍弹性斜率法和双切线法确定了结构的极限载荷。文章通过比较 ,发现ASME规范中给出的斜接管结构应力集中系数算法比较保守。本文还对小变形理论和大变形理论的结果作了比较 ,得出在计算结构的极限载荷时 ,用小变形理论亦可得到足够精确的结果
In this paper, the three-dimensional finite element method is used to study the ultimate load of a cylindrical container with a 30 ° miter tube under internal pressure. The stress concentration factor, the expansion of the plastic area and the deformation of the container are determined by calculation. The elastic slope method and the double tangent method determine the ultimate load of the structure. By comparison, the article finds that the algorithm of stress concentration factor for miter tube structure given in ASME is conservative. The paper also compares the results of the small deformation theory and the large deformation theory and concludes that in calculating the ultimate load of the structure, the small deformation theory can also obtain sufficiently accurate results