Experimental and numerical investigation of the strain rate-dependent compression behaviour of a carbon-epoxy structure

T. Schmack, T.M. Morgado Martins Filipe, G. Deinzer, C. Kassapoglou, F. Walther

Research output: Contribution to journalArticleScientificpeer-review

8 Citations (Scopus)
16 Downloads (Pure)

Abstract

The usage of fibre-reinforced composites in automotive body structures is still a rarity. The main goal in body structure development is to design lightweight structures as cost-efficient as possible. This research contributes to the approach of maximal material usage by considering the strength increase of a carbon-epoxy laminate with increasing strain rate. The objective was to substantiate the well-known material characteristic's strain rate dependency from a coupon level to realistic body structure component – experimentally and numerically. Hence, a special compression fixture was developed to obtain all necessary characteristic values of the investigated T700S DT120 prepreg system. The rectangular coupon specimens were loaded with quasi-static to intermediate strain rates (2×10-4 to 70s-1). A second compression fixture was developed to axial load omega cross-sectional specimens with strain rates from 2×10-4 to 5s-1. The experimental tests showed a significant increase of +23% and +21% in compression strength for rectangular coupon specimens and omega cross-sectional components, respectively. Furthermore, the numerical simulation showed the same increase in strength of +21% for omega cross-sectional components. This work has proven the necessity of considering the strain rate dependency of a composite material to accurately predict the maximum load capacity of a structure during a dynamic load event like a crash.

Original languageEnglish
Pages (from-to)256-262
Number of pages7
JournalComposite Structures
Volume189
DOIs
Publication statusPublished - 1 Apr 2018

Keywords

  • Carbon fibre
  • Compression strength
  • Epoxy
  • Finite Element Analysis
  • Prepreg
  • Strain rate

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