Separation of Primary Stress in Finite Element Analysis of Pressure Vessel with the Principle of Superposition
A key problem in engineering application of “design by analysis” approach is how to decompose a total stress field obtained by the finite element analysis into different stress categories defined in the ASME Code III and VIII-2. In this paper, we suggested an approach to separate primary stress with the principle of superposition, in which the structure does not need to be cut into primary structure but analyzed as a whole only with decomposed load. Taking pressurized cylindrical vessel with plate head as example, the approach is demonstrated and discussed in detail. The allowable load determined by the supposed method is a little conservative than that determined by limited load analysis.
Yu Zhou, Shan-Tung Tu and Xishan Xie
B. J. Gao et al., "Separation of Primary Stress in Finite Element Analysis of Pressure Vessel with the Principle of Superposition", Key Engineering Materials, Vols. 353-358, pp. 373-376, 2007