Mitigation Against Forming Defects by Local Modification of Dry Preforms

Bruno Vermes, Adam Thompson, Jonathan Belnoue, Stephen Hallett, Dmitry Ivanov*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

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Abstract

The advantages of continuous reinforcements are known – the continuity in material provides efficient load paths, avoids triggering delaminations at ply drops sites, and makes the ply deposition easier. However, the continuity of reinforcement causes difficulty in forming or draping of preforms. Some
geometries may be simply not formable, i.e. it is not possible to comply material with a tool without excessive shearing and causing critical defects – wrinkles, folds, and fabric distortions. The paper discusses feasibility of a new approach to defect mitigation in forming: local modifications of textile preforms. The local deformability of preforms and the resistance of preforms to shearing is enhanced by printing liquid resin into preform and its subsequent thermal treatment. Modification of fabrics leads to the redistribution of shear angles and suppression of wrinkling. The position and distribution of patches with modified deformability were derived through numerical simulations. Manufacturing
trials with the position of patches dictated by the simulations successfully confirmed the possibility of defect mitigation.
Original languageEnglish
Title of host publicationECCM 2018 - 18th European Conference on Composite Materials
Publisher Applied Mechanics Laboratory
Number of pages6
ISBN (Electronic)9781510896932
Publication statusPublished - 25 Jun 2018
Event18th European Conference on Composite Materials - Athens, Athens, Greece
Duration: 25 Jun 201828 Jun 2018

Publication series

NameECCM 2018 - 18th European Conference on Composite Materials

Conference

Conference18th European Conference on Composite Materials
CountryGreece
CityAthens
Period25/06/1828/06/18

Keywords

  • defects
  • formability
  • preforms
  • stabilisation
  • wrinkling

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