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A comparative study on glass and carbon fibre reinforced laminated composites in scaled quasi-static indentation tests

A comparative study on glass and carbon fibre reinforced laminated composites in scaled quasi-static indentation tests
A comparative study on glass and carbon fibre reinforced laminated composites in scaled quasi-static indentation tests
This paper investigates the effect of fibre properties of composite structures on the mechanical performance and formation of low-velocity impact damage. Quasi-static indentation tests were conducted on a comprehensive set of scaled Quasi Isotropic (QI) S-glass/8552 epoxy and QI IM7-carbon/8552 epoxy laminates, comparing changes in both in-plane dimensions and fully three-dimensionally scaled cases. Due to the higher thickness of the S-glass laminates, the mechanical results were normalized by a thickness scaling rule to have a fair comparison between the mechanical behaviour. The results demonstrated that the shape of the load-displacement of the S-glass/epoxy laminates is similar to that of the IM7-carbon laminates, with evident changes in rigidity appearing due to the onset and propagation of delamination and final failure caused by fibre breakage. The S-glass/8552 epoxy laminates had smaller load drops, higher deflection and higher mechanical energy absorption before failure compared to the IM7-carbon/8552 epoxy laminates. X-ray computed tomography scanning revealed that delamination is the dominant failure mode for the investigated laminates, and the shape of delamination was influenced by the ply angles at the interfaces. Comparing the glass and carbon laminates, ultrasonic C-scan results indicated similar delamination damage size for the initiation stage, however the damage size was found to be dependent on the fibre properties and layup sequence in the propagation stage.
carbon/epoxy, delamination, glass/epoxy, impact, indentation
0263-8223
Fotouhi, Mohamad
71cada36-1cae-451d-8e3a-ab040cc7551a
Damghani, Mahdi
6050e4ec-ddf0-49e0-975a-44b8be779652
Leong, Mun Choong
c1d0d19c-10fe-4a61-990a-11b2655b259f
Fotouhi, Sakineh
8fb7436a-d536-4677-89b2-fd0cc3e5fc97
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Wisnom, Michael R.
93bec88e-5256-49f2-9869-5ac551e18d7a
Fotouhi, Mohamad
71cada36-1cae-451d-8e3a-ab040cc7551a
Damghani, Mahdi
6050e4ec-ddf0-49e0-975a-44b8be779652
Leong, Mun Choong
c1d0d19c-10fe-4a61-990a-11b2655b259f
Fotouhi, Sakineh
8fb7436a-d536-4677-89b2-fd0cc3e5fc97
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Wisnom, Michael R.
93bec88e-5256-49f2-9869-5ac551e18d7a

Fotouhi, Mohamad, Damghani, Mahdi, Leong, Mun Choong, Fotouhi, Sakineh, Jalalvand, Meisam and Wisnom, Michael R. (2020) A comparative study on glass and carbon fibre reinforced laminated composites in scaled quasi-static indentation tests. Composite Structures, 245. (doi:10.1016/j.compstruct.2020.112327).

Record type: Article

Abstract

This paper investigates the effect of fibre properties of composite structures on the mechanical performance and formation of low-velocity impact damage. Quasi-static indentation tests were conducted on a comprehensive set of scaled Quasi Isotropic (QI) S-glass/8552 epoxy and QI IM7-carbon/8552 epoxy laminates, comparing changes in both in-plane dimensions and fully three-dimensionally scaled cases. Due to the higher thickness of the S-glass laminates, the mechanical results were normalized by a thickness scaling rule to have a fair comparison between the mechanical behaviour. The results demonstrated that the shape of the load-displacement of the S-glass/epoxy laminates is similar to that of the IM7-carbon laminates, with evident changes in rigidity appearing due to the onset and propagation of delamination and final failure caused by fibre breakage. The S-glass/8552 epoxy laminates had smaller load drops, higher deflection and higher mechanical energy absorption before failure compared to the IM7-carbon/8552 epoxy laminates. X-ray computed tomography scanning revealed that delamination is the dominant failure mode for the investigated laminates, and the shape of delamination was influenced by the ply angles at the interfaces. Comparing the glass and carbon laminates, ultrasonic C-scan results indicated similar delamination damage size for the initiation stage, however the damage size was found to be dependent on the fibre properties and layup sequence in the propagation stage.

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More information

e-pub ahead of print date: 6 April 2020
Published date: 1 August 2020
Additional Information: M1 - 112327
Keywords: carbon/epoxy, delamination, glass/epoxy, impact, indentation

Identifiers

Local EPrints ID: 446858
URI: http://eprints.soton.ac.uk/id/eprint/446858
ISSN: 0263-8223
PURE UUID: 31d6ac07-f49e-4cd8-b891-3f66f43b8a2b
ORCID for Meisam Jalalvand: ORCID iD orcid.org/0000-0003-4691-6252

Catalogue record

Date deposited: 24 Feb 2021 17:32
Last modified: 16 Sep 2021 11:14

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Contributors

Author: Mohamad Fotouhi
Author: Mahdi Damghani
Author: Mun Choong Leong
Author: Sakineh Fotouhi
Author: Michael R. Wisnom

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