Fatigue Behaviour of Triaxial Braided Composites under Tension-Tension and Compression-Compression Loading

Abstract:

The fatigue behaviour of [0°/±45°] triaxial braided composites is investigated. Tension-tension and compression-compression loading is chosen to study main damage mechanisms and their effect on the stiffness degradation. In both cyclic loading cases a high stiffness degradation can be observed shortly after the start of cyclic loading. Inter-fibre fractures in the braid yarns with subsequent delaminations are responsible for this behaviour during tension-tension loading. Compression-compression loading leads to kink band formation in the axial yarns favoured by yarn undulations. In consequence of the observed material degradation, S-N curves based on a defined level of stiffness degradation are proposed for fatigue dimensioning instead of load cycles to fracture.

• Periodical: Key Engineering Materials (Volume 809)
• Pages: 23-28
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.809.23
• Online since: June 2019
• Authors: Florian Herrla*, Helmut Rapp
• Keywords: Braided Composite, Fatigue, Stiffness Degradation

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