Application of the boundary shape perturbation method to stress analysis of laminated composites with ply waviness

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Abstract

Ply waviness is a manufacturing defect that occurs in thick fibre-reinforced composite laminates during the curing process. It is known to cause significant degradation of mechanical properties and fatigue life, particularly under compressive loading. To predict failure in the vicinity of the wavy layer, accurate information about stresses at the undulating interfaces is needed. In this paper, an analytical approach to determination of stresses in laminated composites with ply waviness subjected to compressive or flexural loading is presented. Using the boundary shape perturbation method, 3D elasticity problem for a laminate with undulating interfaces is transformed into a sequence of 3D elasticity problems for a reference laminate with perfectly flat layers. The application of the presented analytical approach to a particular problem is illustrated with the example of a transversally loaded laminated plate with a wavy layer. (C) 2004 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)137-143
Number of pages6
JournalComposites Part A: Applied Science and Manufacturing
Volume36
Issue number2
DOIs
Publication statusPublished - Feb 2005
Event7th International Conference on Deformation and Fracture of Composites (DEF-7) - Sheffield, United Kingdom
Duration: 22 Apr 200324 Apr 2003

Keywords

  • laminates
  • elasticity
  • stress concentration
  • analytical modelling
  • fiber waviness
  • layer waviness
  • compressive failure
  • shear instability
  • curved composites
  • mechanics
  • strength

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