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Energy dissipation during delamination in composite materials – an experimental assessment of the cohesive law and the stress-strain field ahead of a crack tip

Energy dissipation during delamination in composite materials – an experimental assessment of the cohesive law and the stress-strain field ahead of a crack tip
Energy dissipation during delamination in composite materials – an experimental assessment of the cohesive law and the stress-strain field ahead of a crack tip
This paper presents detailed experimental information on mode-II delamination development in fibre/epoxy composite materials and provides observations about the process zone in the vicinity of the crack tip. It is shown that the energy dissipated in delamination propagation is spent on two ways (i) creating new fracture surfaces (delamination) and (ii) nonlinear shear deformation in the composite plies adjacent to the delaminating interface. Therefore, the nonlinear process zone is not restricted to the resin-rich interface between the layers, but also extends into the fibre/epoxy composite layers. This is different from the conventional assumption in modelling delamination using cohesive elements where the fibre/epoxy layers are fully linear-elastic and the process zone is lumped at the plane of fracture. Based on the accurately measured displacement field around the crack tip, the experimental traction-separation relation at the interface is found to be trapezoidal which is again different from the conventional bilinear cohesive law.
hybrid composites, interface, plastic deformation, scanning electron microscopy, traction-separation law
0266-3538
115-124
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Czél, Gergely
f6a95d06-75a3-4ca8-8912-098395a6eb80
Fuller, Jonathan D.
2ae99fe1-a6cd-4769-a45b-a9ee45a47f0b
Wisnom, Michael R.
93bec88e-5256-49f2-9869-5ac551e18d7a
Canal, Luis P.
1228d694-0f7c-43bb-8765-be464edb1c5c
González, Carlos D.
86339766-4ac6-4758-8a04-7850e3e9abd3
LLorca, Javier
9560fc88-10dc-4849-bb29-788012d138d6
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Czél, Gergely
f6a95d06-75a3-4ca8-8912-098395a6eb80
Fuller, Jonathan D.
2ae99fe1-a6cd-4769-a45b-a9ee45a47f0b
Wisnom, Michael R.
93bec88e-5256-49f2-9869-5ac551e18d7a
Canal, Luis P.
1228d694-0f7c-43bb-8765-be464edb1c5c
González, Carlos D.
86339766-4ac6-4758-8a04-7850e3e9abd3
LLorca, Javier
9560fc88-10dc-4849-bb29-788012d138d6

Jalalvand, Meisam, Czél, Gergely, Fuller, Jonathan D., Wisnom, Michael R., Canal, Luis P., González, Carlos D. and LLorca, Javier (2016) Energy dissipation during delamination in composite materials – an experimental assessment of the cohesive law and the stress-strain field ahead of a crack tip. Composites Science and Technology, 134, 115-124. (doi:10.1016/j.compscitech.2016.08.001).

Record type: Article

Abstract

This paper presents detailed experimental information on mode-II delamination development in fibre/epoxy composite materials and provides observations about the process zone in the vicinity of the crack tip. It is shown that the energy dissipated in delamination propagation is spent on two ways (i) creating new fracture surfaces (delamination) and (ii) nonlinear shear deformation in the composite plies adjacent to the delaminating interface. Therefore, the nonlinear process zone is not restricted to the resin-rich interface between the layers, but also extends into the fibre/epoxy composite layers. This is different from the conventional assumption in modelling delamination using cohesive elements where the fibre/epoxy layers are fully linear-elastic and the process zone is lumped at the plane of fracture. Based on the accurately measured displacement field around the crack tip, the experimental traction-separation relation at the interface is found to be trapezoidal which is again different from the conventional bilinear cohesive law.

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More information

Published date: 6 October 2016
Keywords: hybrid composites, interface, plastic deformation, scanning electron microscopy, traction-separation law

Identifiers

Local EPrints ID: 446780
URI: http://eprints.soton.ac.uk/id/eprint/446780
ISSN: 0266-3538
PURE UUID: 1b5e65ea-a6e3-4ab8-b1b7-c965a486e8aa
ORCID for Meisam Jalalvand: ORCID iD orcid.org/0000-0003-4691-6252

Catalogue record

Date deposited: 22 Feb 2021 17:32
Last modified: 23 Feb 2021 02:58

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Contributors

Author: Gergely Czél
Author: Jonathan D. Fuller
Author: Michael R. Wisnom
Author: Luis P. Canal
Author: Carlos D. González
Author: Javier LLorca

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