In situ measurements of through-the-thickness strains during processing of AS4/8552 composite

Tomasz Garstka*, N. Ersoy, K. D. Potter, M. R. Wisnom

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)

82 Citations (Scopus)

Abstract

A novel approach has been developed to measure in situ the through-the-thickness strains during processing of epoxy composites. The technique captures the thermal expansion during the heating stages, the laminate consolidation throughout the cure process, and also the cure shrinkage. The tests were performed on 45 trim x 45 mm x 4 mm samples, for both unidirectional and cross-ply laminates. A ply pull-out technique was used to determine the position of the gel point of the AS4-8552 composite system for various curing temperatures. The relationship between the chemical shrinkage and the degree of cure was deduced from a cure kinetics model. Finally the relative contributions of cure shrinkage, thermal expansion and consolidation to the through-thickness strain were distinguished. (c) 2007 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)2517-2526
Number of pages10
JournalComposites Part A: Applied Science and Manufacturing
Volume38
Issue number12
DOIs
Publication statusPublished - 2007

Keywords

  • CHEMICAL SHRINKAGE
  • CURE SHRINKAGE
  • STRESS
  • FLOW
  • VINYL-ESTER RESIN
  • COMPACTION
  • MODEL
  • residual/internal stress
  • THERMAL-EXPANSION
  • EPOXY-RESIN
  • cure behaviour
  • consolidation
  • EVOLUTION

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