Journal
COMPOSITE STRUCTURES
Volume 266, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2021.113776
Keywords
Composite laminates; Delamination buckling; Energy release rate; Mixed-mode fracture; Damage tolerance; CAI
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Funding
- European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant [842543]
- Marie Curie Actions (MSCA) [842543] Funding Source: Marie Curie Actions (MSCA)
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This study introduces a novel analytical modelling approach for robust and efficient predictions of buckling-driven delamination propagation. The model considers various mechanical couplings and contact modes, significantly enhancing the capabilities of current analytical approaches. The findings help identify governing deformation characteristics of buckling-driven delamination growth and provide insights into damage tolerant design and the improvement of compression after impact (CAI) strength in composite structures.
Robust and efficient predictions of buckling-driven delamination propagation, enabled by a novel analytical modelling approach, are presented. The model considers full mechanical coupling (extension-shear, extension-bend, extension-twist/shear-bend and bend-twist), contact and mode-mixity and thus significantly enhances the capabilities of current analytical approaches. A problem description in cylindrical coordinates enables the evaluation of the energy release rate along the delamination boundary. The model uses an energy formalism to determine the post-buckling deformation and a crack-tip element analysis employing force and moment resultants acting on the delamination boundary to determine the energy release rate. Composite panels with circular thin-film delaminations and various multi-directional stacking sequences are investigated for in-plane compressive loading. Predictions of applied strains causing delamination growth, i.e. threshold strain, show good agreement with published experimental data and 3D finite element analysis. A parametric study varying the ratio of delamination size to depth is performed. Based on the findings obtained, governing deformation characteristics of buckling-driven delamination growth are identified and insight into damage tolerant design of composite laminates is obtained, which is of particular interest for compression after impact (CAI) strength of composite structures.
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