Mixed Mode delamination of multidirectional carbon fibre/epoxy laminates

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Title: Mixed Mode delamination of multidirectional carbon fibre/epoxy laminates
Authors: Svensson, N.
Gilchrist, M. D.
Permanent link: http://hdl.handle.net/10197/4778
Date: 1998
Abstract: Scanning electron microscopy was used to identify fractographic features that are characteristic of different modes of interlaminar fracture. The cusp angle and the amount of fiber pull-out on the fracture surface can be used to characterize the different loading modes. A large amount of fiber pull-out is the dominant feature of a mode I fracture, while in mode II large cusp angles and many cusps are the main characteristics. The amount of fiber pull-out, and subsequently brokenfibers, per unit area was investigated and found to vary in proportion to the degree of mode I loading. Such methods can be used to analyze failure and the propagation ofdelamination in structural components. The energy associated with cusp formation constitutes a large proportion of the mode IIfracture toughness component, while the amount of fiber pull-out and fracture has a considerable influence on the mode I fracture component. The cusp angle was seen to provide a quantitative measure of the fracture surface roughness. A failure criterion that takes the fracture surface appearance into account was evaluated. The cusp angle was subsequently used to modify this failure criterion. As a consequence, this provided improved agreement with the experimental data.
Type of material: Journal Article
Publisher: Taylor and Francis
Copyright (published version): 1998 Taylor and Francis
Keywords: carbon fibre/epoxy laminates;mixed mode
DOI: 10.1080/10759419808945903
Language: en
Status of Item: Peer reviewed
Appears in Collections:Mechanical & Materials Engineering Research Collection

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