Investigating the fatigue behaviour of quasi-isotropic pseudo-ductile thin-ply carbon/glass epoxy hybrid composites
Investigating the fatigue behaviour of quasi-isotropic pseudo-ductile thin-ply carbon/glass epoxy hybrid composites
This paper investigates the fatigue behaviour of pseudo-ductile Quasi-Isotropic (QI) interlayer hybrids with un-notched and open-hole configurations. Two different types of QI pseudo-ductile hybrids were evaluated; HighC, with carbon to glass thickness ratio of 0.29, that is made of thin-ply M46JB-carbon/epoxy and thin-ply Xstrand-glass/epoxy prepregs, and LowC, with carbon to glass thickness ratio of 0.19, that is made of thin-ply T300-carbon/epoxy and standard-ply S-glass/epoxy prepregs. The hybrid configurations were loaded at 4 Hz in tension–tension fatigue without any initial damage and at different percentages of the pseudo-yield stress (σpy) at which damage initiates. It was observed that there is no stiffness reduction, after 100,000 cycles, for a stress level of 80 % and 50 % of the σpy for the un-notched and open-hole laminates, respectively. By increasing the stress level to 90 % and 70 % of the σpy for the un-notched and open-hole laminates, respectively, there is a gradual stiffness reduction due to the appearance of matrix cracking and delamination in LowC, but no gradual reduction and no visible damage were observed for HighC. The final failure is more brittle and happens at a lower number of cycles for HighC compared with LowC. Different damage extents were observed for the investigated laminates before the final sudden failure due to variables such as the ply thickness, the cyclic energy release rate and the interfacial fracture toughness.
Fatigue analysis, Hybrid composites, Open-hole, Pseudo-ductility, Un-notched
Fotouhi, Mohamad
71cada36-1cae-451d-8e3a-ab040cc7551a
Suwarta, Putu
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Tabatabaeian, Ali
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Fotouhi, Sakineh
8fb7436a-d536-4677-89b2-fd0cc3e5fc97
Jenkin, Ross
0910d2da-8719-479e-b423-73c0ac87d514
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Wisnom, Michael R.
93bec88e-5256-49f2-9869-5ac551e18d7a
1 December 2022
Fotouhi, Mohamad
71cada36-1cae-451d-8e3a-ab040cc7551a
Suwarta, Putu
03f07d7c-4d52-42a3-820e-8b8a9be9857f
Tabatabaeian, Ali
17364615-edb6-4a63-aeaa-07a7a1c3fc32
Fotouhi, Sakineh
8fb7436a-d536-4677-89b2-fd0cc3e5fc97
Jenkin, Ross
0910d2da-8719-479e-b423-73c0ac87d514
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Wisnom, Michael R.
93bec88e-5256-49f2-9869-5ac551e18d7a
Fotouhi, Mohamad, Suwarta, Putu, Tabatabaeian, Ali, Fotouhi, Sakineh, Jenkin, Ross, Jalalvand, Meisam and Wisnom, Michael R.
(2022)
Investigating the fatigue behaviour of quasi-isotropic pseudo-ductile thin-ply carbon/glass epoxy hybrid composites.
Composites Part A: Applied Science and Manufacturing, 163, [107206].
(doi:10.1016/j.compositesa.2022.107206).
Abstract
This paper investigates the fatigue behaviour of pseudo-ductile Quasi-Isotropic (QI) interlayer hybrids with un-notched and open-hole configurations. Two different types of QI pseudo-ductile hybrids were evaluated; HighC, with carbon to glass thickness ratio of 0.29, that is made of thin-ply M46JB-carbon/epoxy and thin-ply Xstrand-glass/epoxy prepregs, and LowC, with carbon to glass thickness ratio of 0.19, that is made of thin-ply T300-carbon/epoxy and standard-ply S-glass/epoxy prepregs. The hybrid configurations were loaded at 4 Hz in tension–tension fatigue without any initial damage and at different percentages of the pseudo-yield stress (σpy) at which damage initiates. It was observed that there is no stiffness reduction, after 100,000 cycles, for a stress level of 80 % and 50 % of the σpy for the un-notched and open-hole laminates, respectively. By increasing the stress level to 90 % and 70 % of the σpy for the un-notched and open-hole laminates, respectively, there is a gradual stiffness reduction due to the appearance of matrix cracking and delamination in LowC, but no gradual reduction and no visible damage were observed for HighC. The final failure is more brittle and happens at a lower number of cycles for HighC compared with LowC. Different damage extents were observed for the investigated laminates before the final sudden failure due to variables such as the ply thickness, the cyclic energy release rate and the interfacial fracture toughness.
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Accepted/In Press date: 10 September 2022
e-pub ahead of print date: 16 September 2022
Published date: 1 December 2022
Additional Information:
Funding Information:
This work was funded under the UK Engineering and Physical Sciences Research Council (EPSRC) Grants; EP/V009451/1 on Next generation of high-performance impact resistant composites with visibility of damage, and the Programme Grant EP/I02946X/1 on High Performance Ductile Composite Technology in collaboration with Imperial College. The data necessary to support the conclusions are included in the paper.
Publisher Copyright:
© 2022
Keywords:
Fatigue analysis, Hybrid composites, Open-hole, Pseudo-ductility, Un-notched
Identifiers
Local EPrints ID: 483363
URI: http://eprints.soton.ac.uk/id/eprint/483363
ISSN: 1359-835X
PURE UUID: a2f5f38e-b52a-465b-acc1-6762f684ee46
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Date deposited: 30 Oct 2023 09:38
Last modified: 18 Mar 2024 03:57
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Contributors
Author:
Mohamad Fotouhi
Author:
Putu Suwarta
Author:
Ali Tabatabaeian
Author:
Sakineh Fotouhi
Author:
Ross Jenkin
Author:
Michael R. Wisnom
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