Journal
COMPOSITE STRUCTURES
Volume 153, Issue -, Pages 914-927Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2016.07.011
Keywords
Polymer-matrix composites (PMCs); Delamination; Fracture toughness; Finite element analysis
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Funding
- Bombardier
- Royal Academy of Engineering
- Queen's University Belfast/China Scholarship Council (QUB/CSC) PhD Scholarship
- State Key Laboratory of High-performance Complex Manufacturing [ZZYJKT2016-04]
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The predictive capability of high fidelity finite element modelling, to accurately capture damage and crush behaviour of composite structures, relies on the acquisition of accurate material properties, some of which have necessitated the development of novel approaches. This paper details the measurement of interlaminar and intralaminar fracture toughness, the non-linear shear behaviour of carbon fibre (AS4)/thermoplastic Polyetherketoneketone (PEKK) composite laminates and the utilisation of these properties for the accurate computational modelling of crush. Double-cantilever-beam (DCB), four-point end-notched flexure (4ENF) and Mixed-mode bending (MMB) test configurations were used to determine the initiation and propagation fracture toughness in mode I, mode II and mixed-mode loading, respectively. Compact Tension (CT) and Compact Compression (CC) test samples were employed to determine the intralaminar longitudinal tensile and compressive fracture toughness. V-notched rail shear tests were used to measure the highly non-linear shear behaviour, associated with thermoplastic composites, and fracture toughness. Corresponding numerical models of these tests were developed for verification and yielded good correlation with the experimental response. This also confirmed the accuracy of the measured values which were then employed as input material parameters for modelling the crush behaviour of a corrugated test specimen. (C) 2016 Elsevier Ltd. All rights reserved.
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