Abstract
Enormous amounts of wastes have been produced due to extensive use of carbon fiber/epoxy resin (CF/EP) composites. The fact that the supercritical fluid can be used to recycle these composites efficiently has attracted widespread concerns. A three-dimensional model of CF/EP laminates considering the interfacial layers was established. The internal stress distribution of laminates was simulated based on a heat transfer model; and the change of shear stress with supercritical temperature and pressure was investigated. The results show that the shear stress concentration was located in the interfacial layers; the maximum shear stress can be expressed by a curve of convex parabola to the temperature; and the most serious damage occurred in interfacial layers when temperature approached the glass-transition temperature of resin.
Highlights
Carbon fiber/epoxy resin (CF/EP) composites are used in a wide range of applications in industries such as aerospace, automotive and renewable energy, due to their interesting combination of properties, strength, durability, high strength-to-weight ratios, and resistance
The stress distribution of CF/EP composites under supercritical conditions has not been studied in the context of recycling
It showed that the maximum shear stress can be expressed by a curve of convex parabola to the temperature, and the peak of shear stress appeared at 250∘C
Summary
Carbon fiber/epoxy resin (CF/EP) composites are used in a wide range of applications in industries such as aerospace, automotive and renewable energy, due to their interesting combination of properties, strength, durability, high strength-to-weight ratios, and resistance. The stress distribution of CF/EP composites under supercritical conditions has not been studied in the context of recycling. With changes of supercritical environment, that is, temperature and pressure, the variation of maximum shear stress was studied The advantage of this simulation is that it is possible to identify the impact of different supercritical conditions on structural failure of composites, which provides useful guidelines for designing the recycling process of CF/EP composites. Based on the assumption that the transitional region is equivalent to the interface layer, an equivalent three-dimensional model of CF/EP laminates was established. Where tf and tfn are the supercritical fluid temperature for the two sides of laminates and h1 and hn are the surface convective heat transfer coefficient
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