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Through-thickness elastic constants of composite laminates

Lookup NU author(s): Professor Geoff Gibson


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This article presents relationships for the through-thickness elastic constants of composite laminates, needed for modelling three-dimensional stress problems. Using the individual ply elastic constants together with the in-plane laminate elastic constants (from laminate theory) results in explicit relationships for, v13, v23, E3, G13 and G23. The Poisson’s ratio and Young’s modulus expressions apply to all laminate types. The shear modulus relationships apply to balance laminates, but are extendable to other laminate types. Relationships are developed here for angle-ply, cross-ply and quasi-isotropic laminates. Results are presented for glass/epoxy and carbon/epoxy laminates, above and below the resin Tg. The importance of coupling stresses and their influence on v13, v23 and E3 is underlined. It is shown, for instance, that equating the laminate through-thickness modulus to the individual ply value can result in a significant under-estimate.

Publication metadata

Author(s): Gibson AG

Publication type: Article

Publication status: Published

Journal: Journal of Composite Materials

Year: 2013

Volume: 47

Issue: 28

Pages: 3487-3499

Print publication date: 01/12/2013

Online publication date: 04/12/2012

ISSN (print): 0021-9983

ISSN (electronic): 1530-793X

Publisher: Sage


DOI: 10.1177/0021998312466907


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Funder referenceFunder name
Australian CRC-ACS research programme, Project 1.3 on Deep Water Composites
246037EU FIRE-RESIST 7th Framework Partnership
NMP-2009-2.5-1EU FIRE-RESIST 7th Framework Partnership