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Mapping fibre failure in situ in carbon fibre reinforced polymers by fast synchrotron X-ray computed tomography

Mapping fibre failure in situ in carbon fibre reinforced polymers by fast synchrotron X-ray computed tomography
Mapping fibre failure in situ in carbon fibre reinforced polymers by fast synchrotron X-ray computed tomography
Fast, in situ synchrotron X-ray computed tomography (CT) has been used to capture damage evolution, particularly fibre failures, before final fracture (within 99.9% of the ultimate tensile stress) in cross-ply carbon fibre/epoxy coupons under continuous monotonic tensile loading for the first time. It is noteworthy that fewer than 8% of the 0° fibres have fractured at 99.9% of the failure load. The majority of fibre breaks appear as isolated events, although some instances of multiple adjacent breaks (clusters) do occur at intermediate and high stress levels. Contrary to conventional wisdom, a cluster of failed fibres would always occur in a burst as a singular failure event: clusters were never seen to accumulate additional broken fibres as load increased suggesting low-level stress concentration local to fibre breaks. Several instances of multiple fractures along individual fibres were observed, providing an estimation of the critical stress transfer length between the fibre and matrix. The factors affecting fibre failure appear to be complex, with distinct sample-to-sample variability being identified for the length-scales tested. This highlights the need for improved understanding of the mechanisms that contribute to final failure, particularly criteria controlling the arrest or otherwise of clustered fracture events.
Carbon fibres, Tensile load, Fibre failure, Damage mechanics, Fast X-ray computed tomography
0266-3538
Garcea, Serafina, Consuelo
1b643f49-4704-4621-a456-1ca22ad62bef
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Spearing, Simon
9e56a7b3-e0e8-47b1-a6b4-db676ed3c17a
Withers, P.J.
95b52224-f306-43a5-b75f-a2828b339f77
Garcea, Serafina, Consuelo
1b643f49-4704-4621-a456-1ca22ad62bef
Sinclair, Ian
6005f6c1-f478-434e-a52d-d310c18ade0d
Spearing, Simon
9e56a7b3-e0e8-47b1-a6b4-db676ed3c17a
Withers, P.J.
95b52224-f306-43a5-b75f-a2828b339f77

Garcea, Serafina, Consuelo, Sinclair, Ian, Spearing, Simon and Withers, P.J. (2017) Mapping fibre failure in situ in carbon fibre reinforced polymers by fast synchrotron X-ray computed tomography. Composites Science and Technology. (doi:10.1016/j.compscitech.2017.06.006). (In Press)

Record type: Article

Abstract

Fast, in situ synchrotron X-ray computed tomography (CT) has been used to capture damage evolution, particularly fibre failures, before final fracture (within 99.9% of the ultimate tensile stress) in cross-ply carbon fibre/epoxy coupons under continuous monotonic tensile loading for the first time. It is noteworthy that fewer than 8% of the 0° fibres have fractured at 99.9% of the failure load. The majority of fibre breaks appear as isolated events, although some instances of multiple adjacent breaks (clusters) do occur at intermediate and high stress levels. Contrary to conventional wisdom, a cluster of failed fibres would always occur in a burst as a singular failure event: clusters were never seen to accumulate additional broken fibres as load increased suggesting low-level stress concentration local to fibre breaks. Several instances of multiple fractures along individual fibres were observed, providing an estimation of the critical stress transfer length between the fibre and matrix. The factors affecting fibre failure appear to be complex, with distinct sample-to-sample variability being identified for the length-scales tested. This highlights the need for improved understanding of the mechanisms that contribute to final failure, particularly criteria controlling the arrest or otherwise of clustered fracture events.

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Accepted/In Press date: 11 June 2017
Keywords: Carbon fibres, Tensile load, Fibre failure, Damage mechanics, Fast X-ray computed tomography

Identifiers

Local EPrints ID: 412294
URI: http://eprints.soton.ac.uk/id/eprint/412294
ISSN: 0266-3538
PURE UUID: 6150aa05-ead2-4969-8870-e0d4cb77b4bd
ORCID for Simon Spearing: ORCID iD orcid.org/0000-0002-3059-2014

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Date deposited: 17 Jul 2017 13:26
Last modified: 07 Oct 2020 04:41

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