Investigation of strain-rate effects in self-reinforced polypropylene composites

S. McKown, W. J. Cantwell

Research output: Contribution to journalArticlepeer-review

36 Scopus citations


The strain-rate sensitivity of a hot-compacted formed self-reinforced thermoplastic composite, based on polypropylene fibers in a polypropylene matrix, was investigated through a series of quasi-static and dynamic tensile tests. Characterization of the mechanical property dependence on strain-rate for a self-reinforced thermoplastic is an important issue when the material forms one part of a hybrid system, as in the case of a thermoplastic fiber-metal laminate that is prone to localized impact loading events. Strain-rates in the range from quasi-static (10-4 s-1) up to 10 s-1 were achieved in the gauge region of rectangular specimens loaded in a servo-hydraulic test machine. A measurable rate effect was observed in key mechanical properties of the self-reinforced composite, and constitutive equations were successfully applied to characterize the strain-rate behavior of the yield stress. Failure of the longitudinal ply fibers was the dominant failure mechanism, whilst the degree of inter-ply delamination varied over the dynamic loading range.

Original languageBritish English
Pages (from-to)2457-2470
Number of pages14
JournalJournal of Composite Materials
Issue number20
StatePublished - Oct 2007


  • Composite
  • Dynamic
  • Fiber-metal laminate
  • Hot-compacted
  • Polypropylene
  • Strain-rate
  • Thermoplastic


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