Mixed mode I + II interlaminar fracture of glass/epoxy multidirectional laminates - Part 2: Experiments

Mixed-mode bending (MMB) tests were performed on glass/epoxy multidirectional specimens with delaminations in 0/theta and theta/-theta type interfaces. The initiation mode I and mode II strain energy release rates (G(I) and G(II)) were obtained from the modified beam theory (MBT) data reduction sche...

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Bibliographic Details
Main Author: Pereira, A. B. (author)
Other Authors: Morais, A. B. de (author)
Format: article
Language:eng
Published: 1000
Subjects:
Polymer-matrix composites (PMCs)
Fracture toughness
Delamination
Online Access:http://hdl.handle.net/10773/5152
Country:Portugal
Oai:oai:ria.ua.pt:10773/5152
Description
Summary:Mixed-mode bending (MMB) tests were performed on glass/epoxy multidirectional specimens with delaminations in 0/theta and theta/-theta type interfaces. The initiation mode I and mode II strain energy release rates (G(I) and G(II)) were obtained from the modified beam theory (MBT) data reduction scheme presented in part 1. Measured compliances agreed well with MBT predictions. Critical energy release rate G, versus G(II)/G fracture loci were built with results of MMB, double cantilever beam (DCB) and end notched flexure (ENF) tests. In spite of some discrepancies, fracture loci appeared to be linear. G(c) values increased moderately with theta for both 0/theta and theta/-theta interfaces.

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