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Comparison of Specimen Geometries for Measuring Through-Thickness Tensile Mechanical Properties of Fibre-Reinforced Polymer Composites

Pemberton, R; Crocker, L; Poole, M; Shaw, R; Gower, M (2021) Comparison of Specimen Geometries for Measuring Through-Thickness Tensile Mechanical Properties of Fibre-Reinforced Polymer Composites. Journal of Composites Science, 5 (3). 84 ISSN 2504-477X

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Abstract

Engineering design of fibre-reinforced polymer (FRP) composite components requires reliable methods for measuring out-of-plane mechanical properties in the through-thickness (T-T) material direction. Within this work, existing indirect and direct T-T test methods and geometries have been evaluated through experimental testing and finite element analysis (FEA). Experimental testing showed variations, particularly in failure properties, for both indirect (failure strengths from 10 - 94 MPa) and direct (failure strengths from 48 - 62 MPa) geometries. Results were shown to be in good agreement with FEA, which also confirmed stress concentration factors. A linear relationship between the magnitude of stress concentration factors and experimentally determined T-T failure strengths was observed for all but one of the direct geometries evaluated. Improved knowledge of stress concentration factors from this work should help instil confidence for industry to use T-T properties determined from these methods.

Item Type: Article
Keywords: fibre-reinforced polymer composites, through-thickness properties, specimen geometry, mechanical testing, finite element analysis (FEA), stress concentrations
Subjects: Advanced Materials > Composites
Divisions: Engineering
Identification number/DOI: 10.3390/jcs5030084
Last Modified: 26 Jul 2021 13:33
URI: http://eprintspublications.npl.co.uk/id/eprint/9252

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