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Mitigation of fatigue damage in self-healing vascular materials

Mitigation of fatigue damage in self-healing vascular materials
Mitigation of fatigue damage in self-healing vascular materials

The fatigue response of an epoxy matrix containing vasculature for the delivery of liquid healing agents is investigated. The release of a rapidly curing, two-part epoxy healing chemistry into the wake of a propagating crack reduces the rate of crack extension by shielding the crack tip from the full range of applied stress intensity factor. Crack propagation is studied for a variety of loading conditions, with the maximum applied stress intensity factor ranging from 62 to 84% of the quasi-static fracture toughness of the material. At the highest level of applied load, the rate of mechanical damage is so fast that the healing agents do not fully mix and polymerize, and the effect of healing is minimal. The self-healing response is most effective at impeding the slower propagating cracks, with complete crack arrest occurring at the lowest level of applied load, and reductions of 79-84% in the rate of crack extension at intermediate loads.

Fatigue, Self-healing, Vascular network
0032-3861
5575-5581
Hamilton, A.R.
9088cf01-8d7f-45f0-af56-b4784227447c
Sottos, N.R.
a329a43c-958b-46fa-9a2c-cb53cd7e4d12
White, S.R.
bcdc6d47-824d-4014-a8e2-58b48cdc8c99
Hamilton, A.R.
9088cf01-8d7f-45f0-af56-b4784227447c
Sottos, N.R.
a329a43c-958b-46fa-9a2c-cb53cd7e4d12
White, S.R.
bcdc6d47-824d-4014-a8e2-58b48cdc8c99

Hamilton, A.R., Sottos, N.R. and White, S.R. (2012) Mitigation of fatigue damage in self-healing vascular materials. Polymer, 53 (24), 5575-5581. (doi:10.1016/j.polymer.2012.09.050).

Record type: Article

Abstract

The fatigue response of an epoxy matrix containing vasculature for the delivery of liquid healing agents is investigated. The release of a rapidly curing, two-part epoxy healing chemistry into the wake of a propagating crack reduces the rate of crack extension by shielding the crack tip from the full range of applied stress intensity factor. Crack propagation is studied for a variety of loading conditions, with the maximum applied stress intensity factor ranging from 62 to 84% of the quasi-static fracture toughness of the material. At the highest level of applied load, the rate of mechanical damage is so fast that the healing agents do not fully mix and polymerize, and the effect of healing is minimal. The self-healing response is most effective at impeding the slower propagating cracks, with complete crack arrest occurring at the lowest level of applied load, and reductions of 79-84% in the rate of crack extension at intermediate loads.

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More information

Accepted/In Press date: 23 September 2012
e-pub ahead of print date: 28 September 2012
Published date: 9 November 2012
Keywords: Fatigue, Self-healing, Vascular network

Identifiers

Local EPrints ID: 413354
URI: http://eprints.soton.ac.uk/id/eprint/413354
ISSN: 0032-3861
PURE UUID: 24b3cb43-4f79-44ea-b079-7d94945c5684
ORCID for A.R. Hamilton: ORCID iD orcid.org/0000-0003-4627-849X

Catalogue record

Date deposited: 22 Aug 2017 16:31
Last modified: 16 Mar 2024 04:30

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Contributors

Author: A.R. Hamilton ORCID iD
Author: N.R. Sottos
Author: S.R. White

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