Finite element modelling of fibre matrix debonding and frictional sliding and their effects on neighbouring fibres
European Wind Energy Master Thesis
E.T. Folmar (TU Delft - Aerospace Engineering)
B. Y. Chen – Mentor (TU Delft - Group Chen)
B. F. Sørensen – Mentor
K. M. Jespersen – Mentor
Daniel M.J. Daniël – Graduation committee member (TU Delft - Group Peeters)
T.K. Jacobsen – Graduation committee member
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Abstract
This thesis explores finite element modelling of fibre-matrix debonding and frictional sliding in
Abaqus, with particular attention given to their influence on neighbouring fibres. It aims to improve model accuracy through advanced simulations and validation methods. A literature review underscores the need for robust finite element models in predicting composite material behaviour in fatigue. Theoretical equations for validating the finite element model are developed.
Single-fibre and multi-fibre models are utilised, with the former being used primarily for validation and the latter being used to simulate various realistic cases. Results demonstrate successful validation and provide insights into the effects of friction along the debond interface on stress concentrations in neighbouring fibres. Key findings indicate that reducing interfacial friction increases crack tip energy release rates, leading to stress fields that could potentially cause fractures in neighbouring fibres near the debond crack tip.