Low velocity impact testing of direct/inline compounded carbon fibre/polyamide-6 long fibre thermoplastic

Abstract

Direct/in-line compounded PA6/CF long fibre thermoplastic was characterized under low velocity impact consistent with ISO standard 6603-2. Additionally, a quasi-static variant of the ISO method was employed to indirectly assess rate sensitivity. At quasi-static loading rates, flow region specimens were notably more brittle considering the force-deflection response. However, the energy absorption did not differ significantly between charge and flow region specimens. Puncture energy increased an average of 0.5 J per 1% increase in fibre weight fraction. Maximum force increased approximately 50 N per 1% increase in fibre weight fraction. Under low velocity impact, consistent trends in terms of puncture energy and maximum force between charge and flow region specimens were noted. Puncture energy increased 0.6 J and 0.4 J per 1% fibre weight fraction for charge and flow region specimens respectively. Maximum force increased 75 N and 60 N per 1% increase in fibre weight fraction for charge and flow region specimens. In terms of rate sensitivity, puncture energy under low velocity impact decreased by 18% on average with respect to quasi-static loading.