Characterization of mixed-mode fracture based on a complementary analysis by means of full-field optical and finite element approaches

Mechanical and fracture properties of particleboard

“…The analysis of the analytical equations allowing calculation the SIF shows that its estimation depends on sample geometry and the loading amplitude. Based on the displacement fields amplitude the CRDF can be related with the kinematic state near the crack tip [19,20,25]. In this case, the CRDF can be calculated from the displacement fields measured by optical metrologies [19,20,25].…”

“…Based on the displacement fields amplitude the CRDF can be related with the kinematic state near the crack tip [19,20,25]. In this case, the CRDF can be calculated from the displacement fields measured by optical metrologies [19,20,25]. In the present paper, we propose to use the Digital Image Correlation (DIC) in order to measure the displacement fields and to evaluate the CRDF.…”

“…As described in Fig. 6, the displacement was calculated in the Zone Of Interest (ZOI) meshed by small groups of pixels, called subsets [19,20,[29][30][31]51]. According with the DIC hypothesis, the light intensity distribution during the test does not change.…”

“…As detailed in works of [19,20,25,52], the CRDF is calculated from the experimental displacement field via an adjustment procedure based on an iterative Newton-Raphson algorithm (see Fig. 7).…”

“…Fewer investigations were carried out on mixed mode fracture toughness of PB and MDF, [13]. Today, several fracture approaches such as the Stress Intensity Factor (SIF) [14][15][16], the Crack Relative Displacement Factor (CRDF) [17][18][19][20] or the energy release rate [21][22][23][24] allow expressing fracture criteria. It should also be noted that usually the damage level could be evaluated from a local approach based on the mechanical fields assigned by the crack tip singularity or by a global approach using the mechanical fields far to the crack tip singularity.…”