Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Influence of T-stress on the Processed Zone Around Crack Tip in CFRP Plates
Submission Author:
Paulo Pedro Kenedi , RJ , Brazil
Co-Authors:
Daniel de Macedo Barreto Netto, Lucas Vignoli, Arthur Adeodato, Paulo Pedro Kenedi
Presenter: Lucas Vignoli
doi://10.26678/ABCM.COBEM2023.COB2023-1104
Abstract
Carbon fiber reinforced polymer (CFRP) laminates are widely employed in different fields due to their low density combined with high stiffness and strength. However, unlike usual materials, composite laminates may present many different failure mechanisms and the stress distribution depends on the material properties due to its anisotropy. Additionally, unidirectional laminae have a much more severe effect on stress concentrations than isotropic materials. In linear elastic fracture mechanics (LEFM), it is well known that the crack tip has a singularity, and the stress components related to the crack tend to zero far away from the crack tip. Alternatively, the nominal stress influence can be considered through the inclusion of T-stress components. The present investigation aims to analytically evaluate the damaged area around the crack tip, also named the processed zone, with and without the T-stress component. The proposed approach is validated against finite element (FE) simulations using the commercial FE software Ansys in conjunction with the Tsai-Wu failure criterion. The influence of fiber-to-load angle is also studied, carrying out a parametric multiscale analysis and applying the VSPK micromechanical model. The preliminary results indicate that the processed zone increases according to the fiber-to-load angle and the T-stress component becomes relevant for high nominal stress loads.
Keywords
processed zone, crack tip, CFRP, Tsai-Wu criterion
