PSI - Issue 33

Vitor E.L. Paiva et al. / Procedia Structural Integrity 33 (2021) 159–170 Author name / Structural Integrity Procedia 00 (2019) 000–000

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Fig. 9. (a) Shape of the dent; (b) strain distribution along a longitudinal line for Specimen #20 obtained from DIC analysis after the first pressure cycle.

Fig. 10. (a) Shape of the dent and (b) strain distribution along a longitudinal line for Specimen #21 obtained from DIC analysis after the first pressure cycle.

The DIC analysis also indicated the full field strain behavior during the cyclic pressurization for all points visualized in the area of inspection. Results for the most-strained points given in Figure 8 and 9 above are given herein. Figures 11 and 12 depict the curve pressure vs. the circumferential strain at these points for the two specimens. From the curves, one can clearly see that there is a progressive (but decreasing) plastic deformation accumulating cycle by