PSI - Issue 60

Rosy Sarkar et al. / Procedia Structural Integrity 60 (2024) 75–92 Rosy Sarkar/ StructuralIntegrity Procedia 00 (2019) 000 – 000

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Figure 14 Ratcheting strain with cycles at room temperature and 7 bars pressure 4.2.2 Elasto-perfectly plastic analysis at 600 ℃ temperature and 7 bars pressure Elasto-perfectly plastic analysis at 600 ℃ and 7 bars pressure with various displacements ranging from 10 mm to 35 mm has been conducted to find the displacement at which ratcheting initiates. It is observed that there is no significant progression in the hysteresis loops up to 15 mm displacement, as shown in Figure 15. Ratcheting is observed at 18 mm displacement and stabilizes from 15 th cycle. Ratcheting at 21 mm displacement stabilizes from 19 th cycle. The ratcheting strain with number of cycles for the displacements considered are compared in Figure 16. The ratcheting strain is higher at higher displacement. The rate of ratcheting strain (slope) is higher at higher displacements.

Figure 15 Hysteresis loops at various displacements at 600 ℃ temperature and 7 bars pressure