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A computationally-efficient micromechanical model for the fatigue life of unidirectional composites under tension-tension loading

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Title: A computationally-efficient micromechanical model for the fatigue life of unidirectional composites under tension-tension loading
Authors: Alves, M
Pimenta, S
Item Type: Journal Article
Abstract: Failure of fibre-reinforced composites is affected by fatigue, which increases the challenge in designing safe and reliable composite structures. This paper presents an analytical model to predict the fatigue life of unidirectional composites under longitudinal tension-tension. The matrix and fibre-matrix interface are represented through a cohesive constitutive law, and a Paris law is used to model fatigue due to interfacial cracks propagating from fibre-breaks. The strength of single-fibres is modelled by a Weibull distribution, which is scaled hierarchically though a stochastic failure analysis of composite fibre-bundles, computing stochastic S-N curves of lab-scaled specimens in less than one minute. Model predictions are successfully validated against experiments from the literature. This model can be used to reduce the need for fatigue testing, and also to evaluate the impact of constituent properties on the fatigue life of composites.
Issue Date: Nov-2018
Date of Acceptance: 14-May-2018
URI: http://hdl.handle.net/10044/1/61038
DOI: https://doi.org/10.1016/j.ijfatigue.2018.05.017
ISSN: 0142-1123
Publisher: Elsevier
Start Page: 677
End Page: 690
Journal / Book Title: International Journal of Fatigue
Volume: 116
Copyright Statement: © 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Sponsor/Funder: European Commission
Royal Academy of Engineering
Funder's Grant Number: RF/133
Keywords: Science & Technology
Technology
Engineering, Mechanical
Materials Science, Multidisciplinary
Engineering
Materials Science
Micro-mechanics
Analytical modelling
Cohesive interface modelling
Fibre reinforced material
Fatigue
HIERARCHICAL SCALING LAW
FIBER-REINFORCED EPOXY
CARBON/EPOXY COMPOSITE
DELAMINATION GROWTH
POLYMER COMPOSITES
FRACTURE-TOUGHNESS
HYBRID COMPOSITES
COHESIVE ZONE
CRACK-GROWTH
FAILURE
0913 Mechanical Engineering
0905 Civil Engineering
Mechanical Engineering & Transports
Publication Status: Published
Online Publication Date: 2018-05-22
Appears in Collections:Mechanical Engineering
Faculty of Engineering