Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 43, Issue 9, Pages 1514-1522Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2012.03.011
Keywords
Polymer-matrix composites (PMCs); Fracture; Stress transfer; Computed tomography
Funding
- EPSRC [EP/E003427/1]
- EPSRC [EP/H01506X/1, EP/E003427/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E003427/1, EP/H01506X/1] Funding Source: researchfish
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High-resolution computed tomography has been carried out for carbon/epoxy laminates loaded in situ to failure. The experimental data allows major damage mechanisms to be quantified in 3D, in an unambiguous and mechanically representative way, where previous experimental analysis is limited. A multi-scale model that predicts damage accumulation in tensile loaded composites is compared to the experimental analysis, to validate the underpinning assumptions within the model and overall performance. The model considers the random nature of fibre-strengths, stress transfer resulting from fibre breaks, fibre/matrix debonding and viscosity of the matrix. Assumptions within the model are made to reduce computational times whilst considering the microscopic behaviour of the whole structure. Both model and experimental results indicate failure of the composite progresses via single fibre breaks, which, at higher loads, evolve into clusters of broken fibres. The model resulted in reasonable predictions of the preceding damage accumulation and final failure load of the structure. (C) 2012 Elsevier Ltd. All rights reserved.
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