PSI - Issue 54

5

Behzad V. Farahani et al. / Procedia Structural Integrity 54 (2024) 638–644 Behzad V. Farahani et al./ Structural Integrity Procedia 00 (2023) 000–000

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a)

b)

Figure 2: a) Virtual clip gauges defined on the DIC domain locating at the initial notch region, b) force/displacement variation correspond to loading and unloading procedure extracted on the defined virtual gauges.

Considering a window of 20  20 (mm 2 ) after the initial notch, Figure 3 depicts the crack opening evolution through displacement variation in y -direction obtained from DIC study upon loading at different loading increments. About the ESPI study, due to the presence of a plastic area where fringes de-correlate, it was not feasible to employ Elber’s methodology like the DIC study. Therefore, it was opted to consider the discontinuities occurred due to the crack presence. Consequently, the analyses have been done on the displacement profiles obtained at different load increments, same as in the DIC study. Figure 4 shows the crack opening evolution captured by ESPI by displacement contours in y -direction. It must be noted that these displacement contours were obtained on one of the crack sides.

Figure 3: Displacement contours obtained for studied specimen upon loading captured at different loading stages to demonstrate the crack opening, DIC analysis.

Figure 4: Displacement contours obtained for tested specimen upon loading captured at different loading stages to demonstrate the crack opening, ESPI analysis.