The importance of accounting for large deformation in continuum damage models in predicting matrix failure of composites

The importance of accounting for large deformation in continuum damage models in predicting matrix failure of composites

Tijs, B.H.A.H. (TU Delft Aerospace Structures & Computational Mechanics; Fokker/GKN Aerospace)
Dávila, C. G. (NASA Langley Research Center)
Turon, A. (University of Girona)
Bisagni, C. (TU Delft Aerospace Structures & Computational Mechanics)

2023

The work presented in this paper investigates the ability of continuum damage models to accurately predict matrix failure and ply splitting. Two continuum damage model approaches are implemented that use different stress–strain measures. The first approach is based on small-strain increments and the Cauchy stress, while the second approach account for large deformation kinematics through the use of the Green–Lagrange strain and the 2nd Piola–Kirchhoff stress. The investigation consists of numerical benchmarks at three different levels: (1) single element; (2) unidirectional single ply open-hole specimen and (3) open-hole composite laminate coupon. Finally, the numerically predicted failure modes are compared to experimental failure modes at the coupon level. It is shown that it is important to account for large deformation kinematics in the constitutive model, especially when predicting matrix splitting failure modes. It is also shown that continuum damage models that do not account for large deformation kinematics can easily be adapted to ensure that the damage modes and failure strength are predicted accurately.

Continuum damage model
Large shear deformations
Ply splitting
Progressive failure

http://resolver.tudelft.nl/uuid:c63c7a25-2446-4c0f-8bfd-9154ad2762df

https://doi.org/10.1016/j.compositesa.2022.107263

1359-835X

Composites Part A: Applied Science and Manufacturing, 164

Institutional Repository

journal article

© 2023 B.H.A.H. Tijs, C. G. Dávila, A. Turon, C. Bisagni