PSI - Issue 28

J. Serra et al. / Procedia Structural Integrity 28 (2020) 381–392 Author name / Structural Integrity Procedia 00 (2019) 000–000

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0.017 MPa, respectively by Maximum Stress criterion; and 16.561 MPa and 0.026 MPa respectively by Equivalent von Mises Stress criterion. Fig. 5 presents, the 5th vibration mode of mesh 4 that revealed the highest values of stress, on top of the cover, for both criterion (Maximum Stress and von Mises Stresses). The medium values of membrane stress and bending stress were: 11.0869 MPa and 0.269 MPa, respectively by Maximum Stress criterion; and 10.632 MPa and 0.309 MPa respectively by Equivalent von Mises Stress criterion.

Fig. 4. Fifth vibration mode of mesh 3.

Fig. 5. Fifth vibration mode of mesh 4.

The results of crack length versus SIFR and crack length versus number of cycles are presented in figures 6 to 9, for body and cover zones, considering the localizations of the flaws (at surface and embedded).