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The characterisation and assessment of curvature in asymmetric carbon fibre composite laminates

Davis, Amelia (2014)
M.Phil. thesis, University of Birmingham.

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Abstract

The process-induced distortions of asymmetric composite laminates have been the focus of many studies to date, given their ‘unpredictable’ nature on reaching room temperature, generating either a ‘saddle’ or cylinder shape and reaching varied degrees of curvature. Models have been devised and developed using classical laminate theory extensions to predict the room temperature shapes and curvatures with greater accuracy. However, because these shape deviations and curvature are shown to be dependent on many factors, (including laminate size, stacking arrangement, thickness, thermal history and constituent properties) a vast range of studies prove incomparable to one another, and exclude noted ageing and environmental effects. The aim of this study was to identify the factors controlling curvature generation in asymmetric carbon fibre laminates in order to quantitatively describe their behaviour. The curvature generation of several cross-ply asymmetric epoxy/carbon fibre composite laminates has been studied by way of composite manufacture (using manual lay-up and vacuum bagging technique) in order to identify the dominant factors controlling curvature, including shrinkage during curing, CTE mismatch and geometry. Measured curvatures were compared to developed theoretical models under a series of interfacial conditions; taking into account the slippage between plies during laminate cure, unaccounted for in previous work. The causes of any deviation between theoretical and experimentally achieved curvatures have been determined and attributed to a number of microstructural defects such as delamination, voiding and, in addition, the degree of cure achieved.

Type of Work:M.Phil. thesis.
Supervisor(s):Strangwood, Martin and Davis, Claire
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Department of Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:5083
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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