Author
M.J. Laffan
Bio: M.J. Laffan is an academic researcher from Imperial College London. The author has contributed to research in topics: Fracture toughness & Toughness. The author has an hindex of 7, co-authored 7 publications receiving 465 citations.
Papers
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TL;DR: A comprehensive review of techniques for the experimental characterisation of the fracture toughness associated with the translaminar (fibre-breaking) failure modes of continuously reinforced laminated composites is presented in this article.
180 citations
TL;DR: In this paper, the fracture toughness associated with fiber tensile failure was measured for a T300/920 laminated carbon/epoxy material system using the compact tension specimen configuration.
119 citations
TL;DR: In this article, the in-plane size, thickness and lay-up effects on the measured fracture toughness associated with fiber tensile failure were investigated for a T300/920 laminated carbon/epoxy material system.
110 citations
TL;DR: In this paper, the relationship between translaminar fracture toughness measured at initiation and initial notch root radius was investigated for cross-ply IM7/8552 carbon/epoxy laminates.
61 citations
TL;DR: In this paper, the fracture toughness associated with the fiber compressive failure was obtained from testing notched unidirectional carbon/epoxy four-point-bend specimens and it was concluded that the most probable cause of the damage morphology was compression-induced shear failure of the composite.
Abstract: The fracture toughness associated with the fibre compressive failure was obtained from testing notched unidirectional carbon/epoxy four-point-bend specimens. Microscopy of failed specimens revealed that onset of damage was characterised by the formation of a single line of fibre breaks at approximately 45° to the plane of the initial notch. A micromechanical finite element model was used to investigate this failure scenario and it was concluded that the most probable cause of the damage morphology was compression-induced shear failure of the composite. An intrinsic material property in this case was deemed to be the mode II critical strain energy release rate associated with the initiation of the 45° crack. For IM7/8552, this was measured to be G IIc = 4.5 ± 0.8 kJ/m 2 .
58 citations
Cited by
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TL;DR: In this paper, the effect of ply thickness scaling of transverse and in-plane shear strength was identified based on classical laminate theory and unnotched tensile tests on quasi-isotropic specimens.
226 citations
TL;DR: A comprehensive review of techniques for the experimental characterisation of the fracture toughness associated with the translaminar (fibre-breaking) failure modes of continuously reinforced laminated composites is presented in this article.
180 citations
TL;DR: In this paper, the authors presented a new methodology to measure the crack resistance curves associated with fiberdominated failure modes in polymer-matrix composites, which is based on the identification of the crack tip location using Digital Image Correlation and the calculation of the J-integral directly from the test data using a simple expression derived for cross-ply composite laminates.
175 citations
TL;DR: In this article, a validation of low-velocity impact Finite Element (FE) modelling is presented, based on switching ply location of reference layup [02,452,902,-452]s T700GC/M21 laminated plates from Bouvet et al.
169 citations
TL;DR: In this paper, a new material model for the dynamic fracture analysis of anisotropic materials has been proposed within the framework of the bond-based peridynamic theory, which enables predicting complex fracture phenomena such as spontaneous crack nucleation and crack branching, curving and arrest.
151 citations