Wood exhibits complex behavior since the elasticity and the fracture evolution are characterized by strongly anisotropic features. Furthermore, the fracture resistance of wood is characterized as mode-dependent. Therefore, meaningful and promising model development for wood or timber structures is always challenging. The work at hand incorporates a mixed-mode fracture mechanism into an anisotropic phase-field approach for modeling wood failure. Therewith, distinctive fracture resistance and the phase-field driving energy are considered by different load modes. Furthermore, the aforementioned anisotropic and mode-dependent phase-field model is constituted within the conceptual Representative Crack Element (RCE) framework, which allows modeling of physical and correct crack deformations, including crack surface opening, closing, shearing, and mixed mode deformations. In particular, the nature of the RCE framework provides an explicit distinction between Mode I and Mode II behaviors. The governing equations are consistently derived and the formulations are implemented into the Finite Element Method context. Representative and demonstrative numerical studies have shown good agreement versus the corresponding experimental evidence. Several meaningful findings and potential perspectives are discussed to close this paper.
|Engineering fracture mechanics
|Veröffentlicht - 15 Juni 2022
- Anisotropic phase-field approach, Mixed mode failure, RCE framework, Wood fracture