Fatigue testing of quasi-UD and cross-ply reinforced composites: the recent achievements of test specimen generation

Juha Korkiakoski, Mikko Kanerva, Olli Saarela

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientific


Tension–tension fatigue testing results, damage development and final failure mode were studied using recently developed dog-bone shaped specimens for a quasi-unidirectional (quasi-UD) glass-fibre reinforced plastic (GFRP) laminate and for a cross-ply laminate reinforced with aramid-fibre reinforcement. The quasi-UD laminate consisted of three non-crimp fabric layers and the cross-ply laminate consisted of six 4H satin weave layers. The laminates were manufactured using a vacuum infusion technique. The study showed that the tension–tension fatigue life of the quasi-UD GFRP laminate and aramid-fibre reinforced cross-ply laminate can be realistically measured using the developed dog-bone specimen. Damage development in the gauge section was observed using photography and thermography for all the specimens. All the glass and aramid-fibre reinforced specimens failed finally in the gauge section. However, the exact location of the damage initiation and accumulation in the thickness direction of the laminate could not be accurately traced. It was observed that the mutual location of each reinforcement fabric in respect to a neighbouring fabric varied, e.g., transversal and axial fibre bundles or stitch loops were located rather randomly in respect to each other.
Original languageEnglish
Title of host publication17th European Conference on Composite Materials
ISBN (Electronic)978-3-00-053387-7
Publication statusPublished - 26 Jun 2016
MoE publication typeB3 Non-refereed article in conference proceedings
EventEuropean Conference on Composite Materials - ICM – Internationales Congress Center München, Munich, Germany
Duration: 26 Jun 201630 Jun 2016
Conference number: 17


ConferenceEuropean Conference on Composite Materials
Abbreviated titleECCM
Internet address


  • fatigue test methods
  • specimen design
  • UD laminate
  • S-N curve

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