PROGRESSIVE DAMAGE MODEL FOR NON-CRIMP FABRIC COMPOSITE: MODELLING FRAMEWORK AND VERIFICATION
DOI:
https://doi.org/10.11113/jm.v48.637Keywords:
Damage Modelling, Non-Crimp Fabric, Finite Element AnalysisAbstract
Non-crimp fabric (NCF) composites have become increasingly used for primary aircraft structures due to its similar mechanical performance as the conventional Carbon Fiber Reinforced Plastic (CFRP) prepreg but comes with a greater manufacturing advantage. Inherent to its manufacturing method such as the Resin Transfer Molding (RTM), the NCF textile comes in dry state and requires stitching to hold the fiber tows in bundle shape for handling purposes. Because of this unique architecture, the damage mechanisms of NCF composites are different compared to unidirectional prepreg, which often comes in tape format. In this study, a progressive damage model operating at mesoscale level is proposed to predict the stiffness and strength of NCF composite laminate. The strength-based model was derived from LaRC05 model with an addition of damage evolution model to account for fracture energy dissipation after damage is initiated. Verification steps were performed using available data on the literature, and comparisons with other damage models such as Hashin model and Tsai-Hill model are conducted to ensure model’s conformity and accuracy. The result from the proposed model demonstrates good agreement with experimental data published by other authors with maximum error up to 16%.
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