Time-dependent reduction of tensile strength caused by interfacial degradation under constant strain duration in UD-CFRP

Jun Koyanagi, Hiroshi Hatta, Fumio Ogawa, Hiroyuki Kawada

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

The residual strength in UD-CFRP was measured after being subjected to constant strain. In order to quantify the strength reduction, the time-dependent variation of interfacial stress-transfer capacity in a single-fiber composite specimen was quantitatively studied using micro-Raman spectroscopy. The analysis originally included a decrease of interfacial frictional stress due to a relaxation of interfacial radial stress and a time-dependency of an interfacial debonding propagation criterion, based on the conventional viscoelastic shear-lag model. The residual strength in UD-CFRP after enduring long-term loading was then analyzed using the global load sharing model with the results of variation of the interfacial property.

Original languageEnglish
Pages (from-to)3007-3026
Number of pages20
JournalJournal of Composite Materials
Volume41
Issue number25
DOIs
Publication statusPublished - 2007 Dec 1

Keywords

  • Interfacial debonding
  • Single-fiber composite
  • Tensile strength
  • Time-dependent degradation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Chemistry

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