PSI - Issue 56

Cosmin Florin POPA et al. / Procedia Structural Integrity 56 (2024) 176–183 Popa Cosmin-Florin/ Structural Integrity Procedia 00 (2019) 000–000

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Fig. 5 The points measured by DIC

Fig. 6 Un-contour specimen phases overlapped over Force - Displacement graph

Fig. 7 depicts three stages of displacement on a contour specimen measured with DIC . The stages were taken in the same order and at the same time as in the previous Fig. 6. The first picture shows the incipient phase, which is the reference position on the measurement when the specimen is not loaded. The second figure shows an intermediary stage of 1 mm displacement (recording by DIC), where 1.3 mm and 587 N according to the Zwick, and the maximum displacement is located in the upper part of the specimen. The last picture shows the last stage before crack propagation, where the maximum displacement is 1.55 mm according to Dantec and 1.8 mm and 829 N according to Zwick. It is worth noting that the force for specimens with contour is higher than that those specimens without contour. The contours provide higher strength to the specimens and higher elongation.