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

Mohamad Fotouhi; Mahdi Damghani; Mun Choong Leong; Sakineh Fotouhi; Meisam Jalalvand; Michael R. Wisnom

doi:10.1016/j.compstruct.2020.112327

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

Mohamad Fotouhi^*, Mahdi Damghani, Mun Choong Leong, Sakineh Fotouhi, Meisam Jalalvand, Michael R. Wisnom

^*Corresponding author for this work

Mechanical And Aerospace Engineering

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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.

Original language	English
Article number	112327
Number of pages	14
Journal	Composite Structures
Volume	245
Early online date	6 Apr 2020
DOIs	https://doi.org/10.1016/j.compstruct.2020.112327
Publication status	Published - 1 Aug 2020

Funding

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 authors acknowledge Hexcel Corporation for supplying materials for this research. The data necessary to support the conclusions are included in the paper.

Keywords

carbon/epoxy
delamination
glass/epoxy
impact
indentation

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10.1016/j.compstruct.2020.112327Licence: CC BY 4.0

Fotouhi-etal-CS-2020-A-comparative-study-on-glass-and-carbon-fibre-reinforced-laminated-compositesFinal published version, 4.8 MBLicence: CC BY 4.0

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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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AU - Jalalvand, Meisam

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

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