Experimental investigation into the thermoelastic spring-in of curved sandwich panels

Yusuf Mahadik*, K. Potter

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

17 Citations (Scopus)

Abstract

An investigation into the thermoelastic spring-in of curved sandwich panels has been conducted. Sandwich panels incorporating solid foam cores and biaxial glass-epoxy skins were manufactured and spring-in measured. The major contributors to spring-in were found to be the thermal expansion and Poisson's ratio of the foam which were subsequently characterised. Also important was the development of resin rich regions on the surface of the panel. Experimental findings were implemented into a finite element (FE) model developed using 3-dimensional elements in ANSYS. The investigation was extended to panels including a core with machined slots. A refined FE model highlighted the influence of in-plane restraint reduction within the core, as well as the effect of a much thicker resin rich region caused by core segmentation. Results showed good agreement with experiment and provided a good basis for shape prediction of sandwich panels. (C) 2013 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)68-80
Number of pages13
JournalComposites Part A: Applied Science and Manufacturing
Volume49
DOIs
Publication statusPublished - Jun 2013

Keywords

  • Laminates
  • Residual/internal stress
  • Optical microscopy
  • COMPONENTS
  • THERMOSETTING COMPOSITE
  • PREDICTION
  • Foams
  • RESIDUAL-STRESS DEVELOPMENT
  • PARTS
  • SHAPE DISTORTIONS
  • LAMINATED COMPOSITES
  • WARPAGE
  • CURE
  • MECHANISMS

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