Effect of crystalline morphology on fatigue crack propagation in polyethylene

James Patrick Runt, M. Jacq

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

An investigation of the influence of crystalline morphology on fatigue crack propagation (FCP) resistance in a slightly branched polyethylene is presented. Various thermal histories have been utilized to generate samples with different crystalline microstructures and the samples were characterized thoroughly using standard methods. Estimation of tie molecule densities was obtained from measurements of brittle fracture stress. Differences in FCP behaviour for the quenched and annealed samples were shown to be dictated by a competing effect between the degree of crystallinity and tie molecule density. Further, larger spherulite size and distribution appeared to have a deleterious effect on fatigue properties. In general, crystalline microstructure is shown to have a significant influence on fatigue crack propagation behaviour.

Original languageEnglish (US)
Pages (from-to)1421-1428
Number of pages8
JournalJournal of Materials Science
Volume24
Issue number4
DOIs
StatePublished - Apr 1 1989

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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