A cut-ply specimen for the mixed-mode fracture toughness and fatigue characterisation of FRPs

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Title: A cut-ply specimen for the mixed-mode fracture toughness and fatigue characterisation of FRPs
Author(s): Charalambous, G
Allegri, G
Lander, JK
Hallett, SR
Item Type: Journal Article
Abstract: © 2015 Elsevier Ltd.The characterisation of mixed-mode fracture toughness and fatigue delamination growth in fibre-reinforced composites is crucial for assessing the integrity of structural elements in service. An asymmetric cut-ply coupon (ACP) loaded in four-point bending is here proposed to carry out the aforementioned characterisations. Analytical expressions of the energy release rate and mode-mixity for the ACP are derived and validated by means of finite element analysis. A fracture toughness and fatigue characterisation of the carbon/epoxy material IM7/8552 is carried out via ACP specimens. It is proved that the material data obtained from ACP specimens match those generated using ASTM standard mixed-mode bending (MMB) coupons. The main reason for the introduction of the ACP test resides in its applicability to characterisation scenarios where measuring the delamination length with optical means, as required for MMB coupons, is difficult. Such scenarios include the investigation of static and fatigue delamination growth at low and high temperatures, which requires the usage of environmental chambers. This poses significant constraints in terms of volume available for the test rigs, and, most importantly, limitations on visual access to observe delamination propagation. However, the manufacturing of ACP coupons is more complex than for MMB specimens and the testing requires several additional precautions that are here discussed in detail.
Publication Date: 18-Mar-2015
Date of Acceptance: 24-Feb-2015
URI: http://hdl.handle.net/10044/1/26826
DOI: https://dx.doi.org/10.1016/j.compositesa.2015.02.020
ISSN: 1359-835X
Publisher: Elsevier
Start Page: 77
End Page: 87
Journal / Book Title: Composites Part A: Applied Science and Manufacturing
Volume: 74
Copyright Statement: © 2014, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Publication Status: Published
Appears in Collections:Faculty of Engineering
Aeronautics



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