A multiaxial fatigue damage model for fibre reinforced polymer composites

Published Date
Composite Structures
December 2013, Vol.106:201–210, doi:10.1016/j.compstruct.2013.05.024

Author 

• Ciaran R. Kennedy ^,
• Conchúr M. Ó Brádaigh
• Sean B. Leen

• Mechanical Engineering, NUI Galway, Ireland

Available online 31 May 2013.

Abstract

A multiaxial fatigue damage model for fibre reinforced polymer composite materials is presented. The model combines (i) fatigue-induced fibre strength and modulus degradation, (ii) irrecoverable cyclic strain effects and (iii) inter-fibre fatigue. The inter-fibre fatigue aspect is based on a fatigue-modified version of the Puck multiaxial failure criterion for static failure. The model is implemented in a user material finite element subroutine and calibrated against fatigue test data for unidirectional glass fibre epoxy. A programme of uniaxial fatigue tests on quasi-isotropic glass fibre epoxy laminates is presented for validation of the novel fatigue damage methodology. The latter is successfully validated across a range of stress levels.

Keywords

GFRP

Fatigue

Damage

Model

Puck

Multiaxial

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