Internal structure and fatigue performance of quasi-unidirectional Non-Crimp Fabric reinforced laminates

Research output: Contribution to journalArticleScientificpeer-review


  • Juha Korkiakoski
  • Essi Sarlin
  • Reija Suihkonen
  • Olli Saarela

Research units

  • Tampere University of Technology


The aim of this work was to study the effect of stitch pattern and stitch tension on tension-tension fatigue performance of quasi-unidirectional non-crimp fabric reinforced glass-fibre/epoxy laminates. Internal structure variations of the laminates were characterised using cross-sectional microscopy imaging for the evaluation of fatigue test results. Reinforcements for the study were manufactured with three different stitch patterns and two different stitch tensions. Based on the results, the stitch pattern contributes in-plane and out-of-plane waviness of fibres, as well as on the size and shape of the axial fibre bundles. The fatigue life and slope parameter of the fitted S-N curve were significantly dependent on the stitch pattern while they were not dependent on the applied stitch tension.


Original languageEnglish
Pages (from-to)3405-3423
Number of pages19
Issue number24
Publication statusPublished - Oct 2017
MoE publication typeA1 Journal article-refereed

    Research areas

  • Polymer-matrix composites, fibre reinforced material, constant amplitude, S-N curves, damage accumulation

ID: 9396295