PSI - Issue 28

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Vasilii Gorokhov et al. / Procedia Structural Integrity 28 (2020) 1416–1425 Author name / Struc ural Integrity Procedia 00 (2019) 000– 0

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Fig. 1. Curves of creep strain as a function of time (solid line – experiment, dashed line – numerical simulation)

Fig. 2. A graph of creep strain as a function of time at the most loaded point of the bellows

It also follows from the calculations that the zone of maximum values of creep deformations (on the outer surface of the bellows), characterized by the length of creep strain trajectory c k , did not coincide with the zone of maximum damage ω located on its inner surface). This circumstance is obviously associated with a significant difference in the SSS type in the zones under consideration. On the outer surface of the bellows, the value of the parameter of SSS type in the zone of maximum stresses ( П 0.81   ) is significantly lower than that on the inner surface ( П 0.83  ).Taking into account the dependence of the damage accumulation rate on the parameter П (with increasing П the rate of damage accumulation increases), it is easy to explain the observed difference in the distribution of damage measures on the outer and inner surfaces of the bellows.