PSI - Issue 75

J. Filho et al. / Procedia Structural Integrity 75 (2025) 353–362

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J.Filho, L. Wittevrongel, F. Pieron, P. Lava / Structural Integrity Procedia (2025)

Fig. 7. Relative error of the measured J -Integrals using the (a) imposed FEA full-field displacements and (b) digital twin.

7. Conclusion This work addressed the implementations that can be used to identify some fracture properties, such as crack-tip position, stress intensity factors and energy release rate using J -Integrals, in the context of fatigue tests using a fully integrated DIC commercial system. Considering a periodic high-frequency signal used to excite specimens subjected to fatigue tests, the signal-locking principle can be used to send sync signals to low-cost, high-resolution and limited frame-rate cameras in order to acquire images at the peaks of the signal, or to reconstruct the source signal using aliasing. Verification tests using synthetically deformed images have shown that the crack opening displacement is not an appropriate metric to extract the crack-tip position and the carried out implementations are capable of extracting the given fracture parameters ( i.e. crack-tip position, crack growth, stress intensity factors and energy release rate using J -Integrals). The paper also illustrates the importance of verification to ensure that no biases are present in the fracture parameter pipeline. Appendix A. Software snapshots For illustrative purposes, Figs. A1 and A2 show snapshots of the implementations present in MatchID using the experimental data from Becker (2024).