Numerical shape, thickness and stacking sequence optimisation and experimental study of hybrid composite plates under in-plane shear loading

Autor: Mahdi Damghani, Jason Matthews, Adrian Murphy, Carol Featherston
Rok vydání: 2023
Předmět:
Zdroj: Damghani, M, Matthews, J, Murphy, A & Featherston, C 2023, ' Numerical shape, thickness and stacking sequence optimisation and experimental study of hybrid composite plates under in-plane shear loading ', Structures, vol. 51, pp. 372-390 . https://doi.org/10.1016/j.istruc.2023.03.066
ISSN: 2352-0124
DOI: 10.1016/j.istruc.2023.03.066
Popis: Shape, thickness and stacking sequence optimisation of a damage tolerant hybrid (GFRP-CFRP) composite laminate is performed using the commercial Optistruct solver. The results of the optimisation study are compared to both a benchmark non-damage tolerant CFRP laminate (without protective surface GFRP plies known as type 1 laminate) and a damage tolerant traditionally optimised hybrid CFRP-GFRP laminate (having X shape CFRP plies known as type 2 laminate), designed and tested in a previous study. The optimised laminate is manufactured using three different manufacturing techniques. The experimental buckling and post-buckling performance of the manufactured laminates are investigated. The optimised hybrid laminate is approximately 8% heavier than the type 1 but 17% lighter than type 2, but with the benefit of protective surface GFRP plies in favour of a damage tolerant design as shown in a previous study. Both numerical and experimental buckling and post-buckling performance studies show that the optimised laminates demonstrate higher pre-buckling stiffness compared to the type 1 design. However, the experimental buckling and failure/collapse loads, unlike the numerically predicted loads, are 24.31% and 26.70% lower, respectively. This is due to the significant number of ply drop-offs in the hybrid laminate design, and hence geometric imperfections and stress concentration effects at these locations leading to early buckling and failure in the post-buckling region.
Databáze: OpenAIRE
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