The interfacial degradation in a model composite of an aramid fibre (Kevlar 49) and unsaturated polyester (UP) followed by absorption and desorption of hot water at 90 โข C was monitored by measuring the variations in residual stress in the embedded fibre by means of the micro-Raman technique. The Fo
The effect of interphase toughness on fibre/fibre interaction in graphite/epoxy composites: an experimental and modelling study
โ Scribed by Maher S. Amer; Linda S. Schadler
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 208 KB
- Volume
- 30
- Category
- Article
- ISSN
- 0377-0486
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โฆ Synopsis
Fibre/fibre interaction in composite materials is a very important micromechanical phenomenon that dictates the composite mechanical behaviour especially the toughness and failure process. A number of models have been developed to predict the fibre/fibre interaction in composite materials, but none of the existing models has considered the effect of interphase toughness on fibre/fibre interaction. In this study, micro-Raman spectroscopy (MRS), with the ability to measure strain in graphite fibres with a spatial resolution of 2 ยตm, was used to measure fibre/fibre interaction in graphite/epoxy model composites with three different interphases. An energy-based model was used to calculate the strain energy release rate (Gi) for the three interphases used in this study. The three interphases, unsized, sized, and PMMA coated, yielded strain energy release rates of 40, 30, and 10 J m -2 respectively. Using the values calculated for strain energy release rate of the interphase and interfacial crack length, the energy-based model predicated stress concentration factor values in agreement with those experimentally measured.
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