Critérios de delaminação em modo-misto de materiais compósitos laminados de vidro/epóxido

Marat-Mendes, R.; Freitas, M.

doi:10.1016/j.ctmat.2013.12.001

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Resumo

A taxa crítica de libertação de energia de laminados de vidro/epóxido usando a Técnica Virtual de Fecho de Fenda para o modo I, modo II, modo misto I+II e modo III foram determinados através dos ensaios Double Cantilever Beam, End Notch Flexure, Mixed- Mode Bending e Edge Crack Torsion, respectivamente. Os resultados foram analisados por meio dos critérios mais utilizados para prever a propagação da delaminação em modo-misto: os critérios Power Law e Benzeggagh & Kenane. Os resultados da taxa crítica de libertação de energia parecem representar com razoável precisão o modo misto.

Palavras-chave:

fibra de vidro/epóxido

critérios de falha

delaminação em modo misto.

Abstract

Critical strain energy release rate of glass/epoxy laminates using the Virtual Crack Closure Technique for mode I, mode II, mixed mode I+II and mode III were determined using the Double Cantilever Beam test, the End Notch Flexure test, the Mixed-Mode Bending test and the Edge Crack Torsion test respectively. Results were analysed through the most widely used criteria to predict delamination propagation under mixed-mode loading: the Power Law and the Benzeggagh & Kenane criteria. Mixed-mode fracture toughness results seem to represent the data with reasonable accuracy.

Keywords:

glass fibre/epoxy

failure criteria

mixed mode delamination.

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