Temperature and loading rate effects in the mode II interlaminar fracture behavior of carbon fiber reinforced PEEK

L. Berger, W. J. Cantwell

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

The combined effect of varying loading rate and test temperature on the mode II interlaminar fracture properties of AS4/carbon fiber reinforced PEEK has been investigated. End notch flexure tests have shown that this thermoplastic-based composite system offers a very high value of interlaminar fracture toughness at room temperature. Increasing the test temperature leads to a reduction in the mode II interlaminar fracture toughness of the composite, with the value at 150°C being approximately one half of the room temperature value. In contrast, increasing the crosshead displacement rate has been shown to increase the value of GIIc by up to 25%. A more detailed understanding of the effect of varying temperature and loading rate on the failure mechanisms occurring at the crack tip of these interlaminar fracture specimens has been achieved using the double end notch flexure (DENF) geometry. Here, extensive plastic flow within the crack tip region was observed in all specimens. It is believed that the rate sensitivity of GIIc reflects the rate-dependent characteristics of the thermoplastic resin.

Original languageBritish English
Pages (from-to)271-281
Number of pages11
JournalPolymer Composites
Volume22
Issue number2
DOIs
StatePublished - Apr 2001

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