Behaviour of bolted composite joints in hygro-thermal environments

Ivanna Pivdiablyk (1) , Patrick Rozycki (1) , Laurent Gornet (1) , Frédéric Jacquemin (1) , Stéphane Auger (2)

1 GeM - Institut de Recherche en Génie Civil et Mécanique
2 CETIM - CEntre Technique des Industries Mécaniques

Environmental conditions have an important impact on the physical and mechanical properties of polyamide 6 used as a matrix in the studied thermoplastic composite material. The controlled desorption and absorption procedures define the time needed to provide the moisture content for required relative humidity levels. Then the campaign of tensile testing reveals the influence of varying parameters on the in-plane properties of the composite material. They are related to both the testing environment, represented by temperature and moisture content in the material, and fibre orientation in order to access the fibre and resin-dominated properties that vary due to environmental conditions. The glass transition temperature is evaluated for all relative humidity levels under consideration in order to analyse the material state as a result of exposure to environmental conditions. Consequently, the out-of-plane behaviour also changes, which may lead to rapid loss of preload in case of bolted joints of the composite material. To avoid the damage of tows during bolt tightening, the preliminary contact compression tests of the composite circular specimens are performed.

Mots clés: thermoplastic composite; mechanical properties; bolted joint; preload; creep

Domaines: Matériaux; Mécanique des structures [physics.class-ph]

Ivanna Pivdiablyk, Patrick Rozycki, Laurent Gornet, Frédéric Jacquemin, Stéphane Auger. Behaviour of bolted composite joints in hygro-thermal environments. ECCM18 - 18th European Conference on Composite Materials, Jun 2018, Athens, Greece. pp.24 - 28. ⟨hal-02443108⟩