An investigation into the effects of micro-compressive defects on interphase behaviour in hemp-epoxy composites using half-fringe photoelasticity

Mark Hughes, Gilles Sèbe, Jamie Hague, Callum Hill, Morwenna Spear, Laurence Mott

Research output: Contribution to journalArticleScientificpeer-review

52 Citations (Scopus)

Abstract

Half-fringe photoelasticity was used to evaluate the two-dimensional state of stress in epoxy matrix micro-tensile specimens. The experimental technique is described in detail and demonstrated by the measurement of the stress distribution around a circular hole in a thin epoxy film subject to uniaxial tension. The results obtained using this photoelastic technique compare well with theoretical solutions. This system has enabled the mapping of stresses in the matrix of single (hemp) filament composites, strained parallel to the fibre axis, to be undertaken. Concentrations of stress were observed in the interphase region, adjacent to kink bands (micro-compressive defects) and stress concentration factors of approx. 1.4 were recorded. The role that these stress concentrations play in the failure of hemp fibre reinforced composites is discussed.

Original languageEnglish
Pages (from-to)13-29
Number of pages17
JournalCOMPOSITE INTERFACES
Volume7
Issue number1
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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