PSI - Issue 14

S.C.S.P. Kumar Krovvidi et al. / Procedia Structural Integrity 14 (2019) 855–863 S.C.S.P. Kumar Krovvidi/ Structural Integrity Procedia 00 (2018) 000–000

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Fig. 2: RCC-MR method to find elasto-plastic strain based on linear elastic analysis

Fig. 3: Bellows convolution modelled in ABAQUS with loading and boundary conditions for (a) pressure and (b) deflection loadings The stresses induced in the bellows due to the loading estimated in linear elastic FEA are given in Figs. 4 and 5. Combined membrane and bending stress intensity due to pressure is given in Fig. 4 and the same due to deflection is given in Fig. 5. In general, the higher stresses in the bellows are observed at root/crest. The stresses and the stains induced in the bellows at the root and resulting cycle life is estimated and given below. The life of the bellows estimated as per RCC-MR is given in Table 2.

Fig. 4: von-Mises stress in bellows due to pressure