Modelling manufacturing deformations in corner sections made of composite materials

Kenan Çinar, Umud Esat Öztürk, Nuri Ersoy, Michael R. Wisnom

Research output: Contribution to journalArticlepeer-review

44 Citations (SciVal)


A three-step finite element model has been implemented to predict the spring-in of L-shaped parts. The material property development during the cure has been modelled as step changes during transitions between viscous, rubbery and glassy states of the resin. The tool-part interaction is modelled as a sliding interface with a constant sliding shear stress. The effect of various material and geometric variables on the deformation of L-Section parts are investigated by a parameter sensitivity analysis. The spring-in predictions obtained by the finite element method are compared to experimental measurements for unidirectional and cross-ply parts of various thicknesses and radii. Results indicate that although a 2D plane strain model can predict the spring-in measured at the symmetry plane fairly well, it is not sufficient to capture the complex deformation patterns observed.

Original languageEnglish
Pages (from-to)799-813
Number of pages15
JournalJournal of Composite Materials
Issue number7
Publication statusPublished - 1 Jan 2014


  • autoclave
  • finite element analysis
  • Polymer-matrix composites
  • residual/internal stress

ASJC Scopus subject areas

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


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