Issue 77

T. Hachimi et alii, Fracture and Structural Integrity, 77 (2026) 173-206; DOI: 10.3221/IGF-ESIS.77.11

Figure 7: Example of a 3D-printed structure, where DIC can reveal crack resistance and damage tolerance.

Figure 8: Example of a fracture surface showing typical features observed in additively manufactured materials.

Identification of fracture parameters (SIFs, CTOD, and J-Integral) By resolving kinematic fields locally near a crack tip, specific measurements of interest, including Stress Intensity Factors (SIFs), Crack Tip Opening Displacement (CTOD), and the J-integral, can be extracted. DIC provides direct and accurate measurement of crack opening, primary to determining polymeric toughness, when subjected to cyclic loading. For complex anisotropic materials, Wang et al. [109] describe a methodology for orthotropic materials where experimentally determined elastic constants (E = 1.59 GPa, v = 0.28) are substituted into the plane strain modulus to determine E’ = 1.7 GPa, leading to accurate predictions of fracture in layer structures. Franklinv and Christopher [35] describe how lightweight GPU accelerated DIC enables the calculation of mixed-mode fracture parameters, exploiting the Benzeggagh-Kenane criterion to bridge the macro scale to material delamination and back through the extracted model parameters. Providing verifiable

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