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Interlaminar toughening mechanisms: in situ growth and modelling

Interlaminar toughening mechanisms: in situ growth and modelling
Interlaminar toughening mechanisms: in situ growth and modelling
Modelling composite toughness and what mechanisms are responsible for added toughness has been less tackled within the composites community. With the advances of computational resources and the development of arbitrary cracking models, such as the Augmented Finite Element Method (AFEM), more complex microstructures can now be tackled with multiple interacting cracks. It has been established that Mode I crack propagation in particle-toughened interlayers within a CFRP laminate involve a process zone rather than a distinct crack tip. This involves multiple cracks forming ahead of the main crack that then coalesce and leave behind bridging ligaments that provide traction across the crack flanks. Preliminary idealised 2D AFEM models are presented in this work, that highlight the effects of the relative role of neat resin to ply interface cohesive properties, and the fraction of ‘idealised de-bonds’/discontinuities, in keeping the crack path within the interlayer. 4- dimensional time-resolved Computed Tomography (CT) experiments complement the abstract models, with the chronology of damage events and resultant crack paths being directly identified in different toughened microstructures. Additionally, quantification of the bridging behaviour elucidated micromechanical differences between the systems, with the number of bridging ligaments and the total bridged area being quantified and compared to macro-scale toughness. This work is intended to improve understanding around interlaminar toughness, and lead to the development and validation of physically representative micro-mechanical models
Borstnar, G.
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Mavrogordato, M.N.
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Yang, Q.D.
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Sinclair, I.
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Spearing, S.M.
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Borstnar, G.
d391eccc-0f99-473c-b7ba-e58f8bb952b4
Mavrogordato, M.N.
f3e0879b-118a-463a-a130-1c890e9ab547
Yang, Q.D.
599df7d4-487c-4255-aca8-d4af7beb1819
Sinclair, I.
6005f6c1-f478-434e-a52d-d310c18ade0d
Spearing, S.M.
9e56a7b3-e0e8-47b1-a6b4-db676ed3c17a

Borstnar, G., Mavrogordato, M.N., Yang, Q.D., Sinclair, I. and Spearing, S.M. (2015) Interlaminar toughening mechanisms: in situ growth and modelling. 20th International Conference on Composite Materials, Denmark. 19 - 24 Jul 2015. 13 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Modelling composite toughness and what mechanisms are responsible for added toughness has been less tackled within the composites community. With the advances of computational resources and the development of arbitrary cracking models, such as the Augmented Finite Element Method (AFEM), more complex microstructures can now be tackled with multiple interacting cracks. It has been established that Mode I crack propagation in particle-toughened interlayers within a CFRP laminate involve a process zone rather than a distinct crack tip. This involves multiple cracks forming ahead of the main crack that then coalesce and leave behind bridging ligaments that provide traction across the crack flanks. Preliminary idealised 2D AFEM models are presented in this work, that highlight the effects of the relative role of neat resin to ply interface cohesive properties, and the fraction of ‘idealised de-bonds’/discontinuities, in keeping the crack path within the interlayer. 4- dimensional time-resolved Computed Tomography (CT) experiments complement the abstract models, with the chronology of damage events and resultant crack paths being directly identified in different toughened microstructures. Additionally, quantification of the bridging behaviour elucidated micromechanical differences between the systems, with the number of bridging ligaments and the total bridged area being quantified and compared to macro-scale toughness. This work is intended to improve understanding around interlaminar toughness, and lead to the development and validation of physically representative micro-mechanical models

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INTERLAMINAR TOUGHENING MECHANISMS - IN SITU GROWTH AND MODELLING.pdf - Other
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More information

e-pub ahead of print date: 19 July 2015
Venue - Dates: 20th International Conference on Composite Materials, Denmark, 2015-07-19 - 2015-07-24
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 383701
URI: https://eprints.soton.ac.uk/id/eprint/383701
PURE UUID: 945c11f4-9dea-4d3d-91ca-e96d56113698
ORCID for S.M. Spearing: ORCID iD orcid.org/0000-0002-3059-2014

Catalogue record

Date deposited: 19 Nov 2015 14:43
Last modified: 17 May 2019 00:35

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Contributors

Author: G. Borstnar
Author: Q.D. Yang
Author: I. Sinclair
Author: S.M. Spearing ORCID iD

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