Evaluation of fatigue strength of plain and notched specimens of short carbon-fiber reinforced polyetheretherketone in comparison with polyetheretherketone

H. Nisitani, Y. H. Kim, Hiroshi Noguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper, rotating-bending fatigue tests of short carbon-fiber reinforced polyetheretherketone (CFRPEEK) and polyetheretherketone (PEEK) were carried out to investigate the fatigue characteristics of plain and notched specimens at room temperature. The fatigue mechanisms in the matrix and composite was clarified through the successive surface observation using the replica method. The results were discussed using linear notch mechanics. In the plain specimen of PEEK, fracture always occurs from defects and the fatigue crack initiation is of the point-initiation type. Furthermore, the fatigue crack growth rate is very high and the fatigue strength is very sensitive to a notch. The fatigue strength of the composite is much more insensitive to a notch than that of PEEK. In general the fatigue crack initiates from near the fiber end, and propagates to the circumferential direction after it grows to some extent along the fiber. The fatigue strength of an arbitrary notched specimen of these two materials will be estimated from the present results rearranged based on 'linear notch mechanics'.

Original languageEnglish
Title of host publicationProc Second Int Offshore Polar Eng Conf
PublisherPubl by Int Soc of Offshore and Polar Engineerns (ISOPE)
Pages55-62
Number of pages8
ISBN (Print)1880653044
Publication statusPublished - Jan 1 1992
EventProceedings of the Second International Offshore and Polar Engineering Conference - San Francisco, CA, USA
Duration: Jun 14 1992Jun 19 1992

Other

OtherProceedings of the Second International Offshore and Polar Engineering Conference
CitySan Francisco, CA, USA
Period6/14/926/19/92

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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