Fatigue crack-propagation in annealed poly(butylene terephthalate)

J. T. Yeh, J. Runt

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16 Scopus citations


Samples with the same percentage crystallinity, supermolecular structure and lamellar thickness but different average molecular weight were prepared to distinguish the effect of tie chain density on fatigue crack propagation (FCP) behaviour. This alteration in molecular weight was accomplished by "controlled" chain degradation during thermal annealing. A significant decrease in FCP resistance was observed when samples were annealed at different temperatures for various amounts of time. In addition, an examination of the fracture surfaces of these specimens indicates a transition to a more brittle-type behaviour when annealed for longer periods of time at any specific annealing temperature. The decrease in FCP resistance is attributed to a decrease in the tie chain density.

Original languageEnglish (US)
Pages (from-to)2637-2642
Number of pages6
JournalJournal of Materials Science
Issue number7
StatePublished - Jul 1989

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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