Characterization of Exponential Cohesive Zone Model for Fracture Assessment of De-Bonded Composite Panels

Abstract:

Composite structures are prone to delamination/de-bond and effective tool to simulate de-lamination is cohesive zone model. Cohesive zone model uses multiple adhesive failure parameters. The influence of adhesive parameters on the delamination and fracture of Double cantilever Beam, subjected to Mode-I loading through finite element simulations is studied usingExponential Cohesive Zone Model (ECZM). Influence of Normal stress (σ), normal deflection (δ_n) and tangential deflection (δ_t) on the de-bond propagation is examined.From the analysis it is found that the tangential deflection (δ_t) has negligible impact on Mode-I loading and fracture of the specimen. Significant effects are seen for the perturbation of Normal stress (σ) and Normal deflection (δ_n). A Finite element based ECZM for composite layer (HTS/M18) with EPG 2601 adhesive is proposed. The model is validated by comparing with test data.

• Periodical: Applied Mechanics and Materials (Volume 877)
• Pages: 436-445
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.877.436
• Online since: February 2018
• Authors: J. Muthupandian*, Koovaparambil Ramunny Pradeep
• Keywords: De-Lamination, Double Cantilever Beam (DCB), Exponential Cohesive Zone Model, Finite Element Analysis, Fracture, Laminated Composites

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