# Experimental and numerical investigation on the impact response of CFRP under 3-point-bending

Nebe, M.; Schmack, T.; Schaefer, T.; Walther, F.

## Abstract:

The strain rate-dependent material characteristic of carbon fiber reinforced plastics (CFRP) is widely known and has been investigated in detail at coupon level. In this study, for the first time the strain rate dependent characteristic of a three-dimensional CFRP structure was investigated. The evolution of the determined strain rate dependency was correlated with the results at coupon level. For this purpose two special 3-point-bending fixtures were developed to obtain the flexural impact response of the investigated T700S DT120 prepreg system at coupon and component (hat profile) level. The rectangular coupon specimens were loaded with quasi-static to intermediate impact velocities from 3.3x10$^{-5}$ to 10ms$^{-1}$ while the structural sub components were tested using impact velocities from 3.3x10$^{-5}$ to 1m s$^{-1}$ With increasing impact velocities, the experimental tests showed a significant increase in force at first failure and maximum deflection at coupon level. The increases in force were of 52% and 120%, respectively. However, the increase for structural hat profile components was just 12.4% due to a different failure mode. ... mehr

 Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK) Publikationstyp Zeitschriftenaufsatz Publikationsjahr 2021 Sprache Englisch Identifikator ISSN: 2666-6820 KITopen-ID: 1000133853 Erschienen in Composites Part C: Open Access Band 4 Seiten Art.-Nr.: 100079 Schlagwörter Carbon fiber; Epoxy; Prepreg; Strain rate; Component testing; 3-Point-bending; Finite element analysis Nachgewiesen in ScopusDimensions
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