Experimentally and analyzed property of carbon fiber reinforced thermoplastic and thermoset plates

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.

Statistical inferences in material selection of a polymer matrix for natural fiber composites

“…Moreover, this polymer has not melted, and so the shape of items made from it would not change if heated. Similar to Okayasu et al [35], the tensile strength of epoxy was found to be twice as good as the other ther moplastics such as PA6 and poly(phenylene sulphide) (PPS) for carbon fiber reinforced polymer. Sivakumar et al [45] found that the tensile strength and modulus of Tsbased material is higher than Tpbased material for a hybrid composite.…”

“…Then, a com parison between the alternative polymers via an esti mation process using statistical modelling is performed. Okayasu et al [35] mentioned, estimation using statisti cal analysis can give a better result compare to the com pound law. Ttest statistics are used in hypothesis test ing and confidence interval to confirm the successful inferential analysis to draw a conclusion about the per formance of the Tp and Ts.…”

“…Chung [34] also claimed that the manufacturing time of Tp is shorter than that of Ts. Another study found that the mechanical properties, such as tensile strength, of Ts are better than those of Tp [35]. Although a number of investigations have reported interesting results for Tp and Ts, no study has examined their performance by using statistical inferences such as hypothesis testing and confidence interval.…”