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Hybrid specimens eliminating stress concentrations in tensile and compressive testing of unidirectional composites

Hybrid specimens eliminating stress concentrations in tensile and compressive testing of unidirectional composites
Hybrid specimens eliminating stress concentrations in tensile and compressive testing of unidirectional composites
Two novel approaches are proposed for elimination of stress concentrations in tensile and compressive testing of unidirectional carbon/epoxy composites. An interlayer hybrid specimen type is proposed for tensile testing. The presented finite element study indicated that the outer continuous glass/epoxy plies suppress the stress concentrations at the grips and protect the central carbon/epoxy plies from premature failure, eliminating the need for end-tabs. The test results confirmed the benefits of the hybrid specimens by generating consistent gauge-section failures in tension. The developed hybrid four point bending specimen type and strain evaluation method were verified and applied successfully to determine the compressive failure strain of three different grade carbon/epoxy composite prepregs. Stable failure and fragmentation of the high and ultra-high modulus unidirectional carbon/epoxy plies were reported. The high strength carbon/epoxy plies exhibited catastrophic failure at a significantly higher compressive strain than normally observed.
A. Carbon fibres, B. Delamination, B. Fragmentation, D. Mechanical testing
1359-835X
436-447
Czél, Gergely
f6a95d06-75a3-4ca8-8912-098395a6eb80
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Wisnom, Michael R.
93bec88e-5256-49f2-9869-5ac551e18d7a
Czél, Gergely
f6a95d06-75a3-4ca8-8912-098395a6eb80
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Wisnom, Michael R.
93bec88e-5256-49f2-9869-5ac551e18d7a

Czél, Gergely, Jalalvand, Meisam and Wisnom, Michael R. (2016) Hybrid specimens eliminating stress concentrations in tensile and compressive testing of unidirectional composites. Composites Part A: Applied Science and Manufacturing, 91, 436-447. (doi:10.1016/j.compositesa.2016.07.021).

Record type: Article

Abstract

Two novel approaches are proposed for elimination of stress concentrations in tensile and compressive testing of unidirectional carbon/epoxy composites. An interlayer hybrid specimen type is proposed for tensile testing. The presented finite element study indicated that the outer continuous glass/epoxy plies suppress the stress concentrations at the grips and protect the central carbon/epoxy plies from premature failure, eliminating the need for end-tabs. The test results confirmed the benefits of the hybrid specimens by generating consistent gauge-section failures in tension. The developed hybrid four point bending specimen type and strain evaluation method were verified and applied successfully to determine the compressive failure strain of three different grade carbon/epoxy composite prepregs. Stable failure and fragmentation of the high and ultra-high modulus unidirectional carbon/epoxy plies were reported. The high strength carbon/epoxy plies exhibited catastrophic failure at a significantly higher compressive strain than normally observed.

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More information

e-pub ahead of print date: 30 July 2016
Published date: 1 December 2016
Keywords: A. Carbon fibres, B. Delamination, B. Fragmentation, D. Mechanical testing

Identifiers

Local EPrints ID: 446072
URI: http://eprints.soton.ac.uk/id/eprint/446072
ISSN: 1359-835X
PURE UUID: 01037432-e574-45ac-bed5-28d4ee38dfc4
ORCID for Meisam Jalalvand: ORCID iD orcid.org/0000-0003-4691-6252

Catalogue record

Date deposited: 20 Jan 2021 17:30
Last modified: 18 Feb 2021 17:42

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Contributors

Author: Gergely Czél
Author: Michael R. Wisnom

University divisions

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