Abstract
The tensile and fatigue properties of long unidirectional (UD) and crossply (CR) carbon fiber reinforced plastics (CFRPs) were investigated. The CFRPs in this study were fabricated from 60% CF and various resins: epoxy, polyamide (PA6), polyphenylene sulfide (PPS), and polyether ether ketone (PEEK). The ultimate tensile strength sUTS of Epoxy-CFRP was found to be about twice that of PEEK-CFRP. Relatively high tensile strengths were found for PPS- and PA6-CFRP in the thermoset resin group, although these were still only about 85% of the strength of epoxy-CFRP. The tensile and fatigue strengths of the CR-CFRPs were less than half those of the UD-CFRPs, even though high ductilities were found for the CR-CFRPs. These high ductilities can be attributed to the crosslinking fiber effect and the low proportion of CFs in the loading direction. The sUTS values of CFRPs depend not only on the tensile strengths s and volume fractions V of CF and resin (i.e., through the conventional compound law sUTS = sfiberVfiber + sresinVresin), but also on several material properties, including the wettability of the CF by the resin. On the basis of the material properties, the ultimate tensile strengths of various UD- and CR-CFRPs were well estimated numerically through a statistical analysis, which afforded better estimates than those obtained from the compound law.
Highlights
Owing to the high demand for materials that are both lightweight and strong, carbon fiber reinforced plastics (CFRPs) have become widely employed in various engineering applications, including the aerospace and automotive industries
Ogi et al (2007) have introduced a recycling method based on a process in which an epoxy-based CFRP (Epoxy-CFRP) with long carbon fibers is crushed to produce particles about 200 μm in diameter, which are mixed with thermoplastic resin via injection molding, to give a short carbon fiber reinforced plastic
It is clear that the tensile strength of Epoxy-CFRP was higher than that of thermoplastic CFRPs for both unidirectional and crossply fiber composites, which can be attributed to the high strength of the epoxy resin
Summary
Owing to the high demand for materials that are both lightweight and strong, carbon fiber reinforced plastics (CFRPs) have become widely employed in various engineering applications, including the aerospace and automotive industries. Ogi et al (2007) have introduced a recycling method based on a process in which an epoxy-based CFRP (Epoxy-CFRP) with long carbon fibers is crushed to produce particles about 200 μm in diameter, which are mixed with thermoplastic resin via injection molding, to give a short carbon fiber reinforced plastic. The mechanical properties of this recycled CFRP (rCFRP) with different weight fractions of short carbon fibers have been investigated. The tensile strength of the resulting recycled material depended on both the proportion and size of the CFRP pieces.
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