Thin ply carbon/glass hybrid laminates to activate new damage mechanisms under indentation
Thin ply carbon/glass hybrid laminates to activate new damage mechanisms under indentation
Low velocity impacts on composite laminates can cause a significant amount of delamination that is often referred to as barely visible impact damage (BVID). This damage can cause significant degradation of structural properties, especially the compressive strength after impact. The aim of this work was to utilise thin ply carbon/glass hybrid laminates to activate new types of damage mechanisms under indentation (quasi-static impact) that are more gradual and easier to detect. Therefore, 3 different types of hybrid composite plates fabricated from novel hybrid architectures of thin ply high modulus carbon (HS40) and standard thickness S-glass laminates were investigated. For comparison, a laminate containing only S-glass plies was investigated as well. The investigated specimens were interrupted at different load-levels and a detailed assessment of the damage evolution was carried out using X-ray Computed Tomography (CT). For all the hybrid configurations, a larger damage area was observed mostly under the indenter and the delaminations were smaller in the middle plies compared to the upper plies. In contrast, for the Glass laminates the delaminations were larger in the middle plies compared to the upper plies. For the hybrid laminates, the percentage of the first load drop in the global load-displacement curves was lower whereas the percentage of the stiffness reduction after the first load drop was higher, compared to the Glass laminate. Overall the hybrid results showed some different damage mechanisms, i.e. carbon ply fibre fracture and delamination under the indenter, with a gradual failure behaviour and less damage to the inner layers. The degradation mechanisms were visually detectable from the indented face from the early stage of the loading for some of the hybrid configurations, which can act as impact damage indicator.
Carbon fibres, Delamination, Fragmentation, Glass fibres, Hybrid composites, Indentation, Thin-plies
Applied Mechanics Laboratory
Fotouhi, M.
71cada36-1cae-451d-8e3a-ab040cc7551a
Jalalvand, M.
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Prato, A.
3d2b9b0e-dcd7-4343-8d99-8d5ae6ab8672
Wisnom, M. R.
655f9d97-0d4c-4654-9b0e-3e5150991e42
2020
Fotouhi, M.
71cada36-1cae-451d-8e3a-ab040cc7551a
Jalalvand, M.
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Prato, A.
3d2b9b0e-dcd7-4343-8d99-8d5ae6ab8672
Wisnom, M. R.
655f9d97-0d4c-4654-9b0e-3e5150991e42
Fotouhi, M., Jalalvand, M., Prato, A. and Wisnom, M. R.
(2020)
Thin ply carbon/glass hybrid laminates to activate new damage mechanisms under indentation.
In ECCM 2018 - 18th European Conference on Composite Materials.
Applied Mechanics Laboratory..
Record type:
Conference or Workshop Item
(Paper)
Abstract
Low velocity impacts on composite laminates can cause a significant amount of delamination that is often referred to as barely visible impact damage (BVID). This damage can cause significant degradation of structural properties, especially the compressive strength after impact. The aim of this work was to utilise thin ply carbon/glass hybrid laminates to activate new types of damage mechanisms under indentation (quasi-static impact) that are more gradual and easier to detect. Therefore, 3 different types of hybrid composite plates fabricated from novel hybrid architectures of thin ply high modulus carbon (HS40) and standard thickness S-glass laminates were investigated. For comparison, a laminate containing only S-glass plies was investigated as well. The investigated specimens were interrupted at different load-levels and a detailed assessment of the damage evolution was carried out using X-ray Computed Tomography (CT). For all the hybrid configurations, a larger damage area was observed mostly under the indenter and the delaminations were smaller in the middle plies compared to the upper plies. In contrast, for the Glass laminates the delaminations were larger in the middle plies compared to the upper plies. For the hybrid laminates, the percentage of the first load drop in the global load-displacement curves was lower whereas the percentage of the stiffness reduction after the first load drop was higher, compared to the Glass laminate. Overall the hybrid results showed some different damage mechanisms, i.e. carbon ply fibre fracture and delamination under the indenter, with a gradual failure behaviour and less damage to the inner layers. The degradation mechanisms were visually detectable from the indented face from the early stage of the loading for some of the hybrid configurations, which can act as impact damage indicator.
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Published date: 2020
Additional Information:
Funding Information:
This work was funded under the UK Engineering and Physical Sciences Research Council (EPSRC) Programme Grant EP/I02946X/1 on High Performance Ductile Composite Technology in collaboration with Imperial College, London. The data necessary to support the conclusions are included in the paper.
Publisher Copyright:
© CCM 2020 - 18th European Conference on Composite Materials. All rights reserved.
Venue - Dates:
18th European Conference on Composite Materials, Megaron Athens International Conference Center, Athens, Greece, 2018-06-24 - 2018-06-28
Keywords:
Carbon fibres, Delamination, Fragmentation, Glass fibres, Hybrid composites, Indentation, Thin-plies
Identifiers
Local EPrints ID: 477811
URI: http://eprints.soton.ac.uk/id/eprint/477811
PURE UUID: b3157db1-8d64-4205-930a-32217ca036b4
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Date deposited: 14 Jun 2023 17:02
Last modified: 18 Mar 2024 03:57
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Contributors
Author:
M. Fotouhi
Author:
A. Prato
Author:
M. R. Wisnom
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