Avoiding free edge delamination in quasi-isotropic pseudo-ductile hybrid laminates - by material dispersion or layer angle dispersion?

Meisam Jalalvand, Mohamad Fotouhi, Gergely Czél, Michael R. Wisnom

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

1 Citation (Scopus)

Abstract

Hybridisation is one of the approaches to introduce pseudo-ductility to brittle composite materials. In this approach, two or more different types of fibre are combined and if the configuration and material constituents are well selected, the tensile response shows a gradual failure and a metal-like stress-strain curve with a pseudo-yeild point. Different types of hybrid composites with continuous layers have been studied to produce pseudo-ductile tensile behaviour. However, most hybrid material studies to date have been focused on Uni-Directional (UD) laminates which are not usually applied in industry due to poor transverse mechanical properties. To make a multi-directional hybrid laminate, different approaches can be selected to mix different fibre types with different fibre orientations. In this paper, two approaches are presented and compared: (i) UD hybrid sublaminates used as the building blocks of hybrid laminates and (ii) dispersed orientation in which non-hybrid multi-directional sublaminates with different fibre types are stacked up. It is shown that the method of dispersed orientation significantly helps to reduce interlaminar stresses at the free edges of the tensile samples and therefore supresses free-edge delamination.

LanguageEnglish
Title of host publicationECCM 2016 - Proceeding of the 17th European Conference on Composite Materials
ISBN (Electronic)9783000533877
Publication statusPublished - 2016
Event17th European Conference on Composite Materials, ECCM 2016 - Munich, Germany
Duration: 26 Jun 201630 Jun 2016

Conference

Conference17th European Conference on Composite Materials, ECCM 2016
CountryGermany
CityMunich
Period26/06/1630/06/16

Fingerprint

Delamination
Laminates
Fibers
Hybrid materials
Composite materials
Stress-strain curves
Fiber reinforced materials
Ductility
Metals
Mechanical properties
Industry

Keywords

  • dispersed delamination
  • fragmentation
  • hybrid composites
  • pseudo-ductility

Cite this

Jalalvand, M., Fotouhi, M., Czél, G., & Wisnom, M. R. (2016). Avoiding free edge delamination in quasi-isotropic pseudo-ductile hybrid laminates - by material dispersion or layer angle dispersion? In ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials
Jalalvand, Meisam ; Fotouhi, Mohamad ; Czél, Gergely ; Wisnom, Michael R. / Avoiding free edge delamination in quasi-isotropic pseudo-ductile hybrid laminates - by material dispersion or layer angle dispersion?. ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials. 2016.
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Jalalvand, M, Fotouhi, M, Czél, G & Wisnom, MR 2016, Avoiding free edge delamination in quasi-isotropic pseudo-ductile hybrid laminates - by material dispersion or layer angle dispersion? in ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials. 17th European Conference on Composite Materials, ECCM 2016, Munich, Germany, 26/06/16.

Avoiding free edge delamination in quasi-isotropic pseudo-ductile hybrid laminates - by material dispersion or layer angle dispersion? / Jalalvand, Meisam; Fotouhi, Mohamad; Czél, Gergely; Wisnom, Michael R.

ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials. 2016.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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AU - Czél, Gergely

AU - Wisnom, Michael R.

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N2 - Hybridisation is one of the approaches to introduce pseudo-ductility to brittle composite materials. In this approach, two or more different types of fibre are combined and if the configuration and material constituents are well selected, the tensile response shows a gradual failure and a metal-like stress-strain curve with a pseudo-yeild point. Different types of hybrid composites with continuous layers have been studied to produce pseudo-ductile tensile behaviour. However, most hybrid material studies to date have been focused on Uni-Directional (UD) laminates which are not usually applied in industry due to poor transverse mechanical properties. To make a multi-directional hybrid laminate, different approaches can be selected to mix different fibre types with different fibre orientations. In this paper, two approaches are presented and compared: (i) UD hybrid sublaminates used as the building blocks of hybrid laminates and (ii) dispersed orientation in which non-hybrid multi-directional sublaminates with different fibre types are stacked up. It is shown that the method of dispersed orientation significantly helps to reduce interlaminar stresses at the free edges of the tensile samples and therefore supresses free-edge delamination.

AB - Hybridisation is one of the approaches to introduce pseudo-ductility to brittle composite materials. In this approach, two or more different types of fibre are combined and if the configuration and material constituents are well selected, the tensile response shows a gradual failure and a metal-like stress-strain curve with a pseudo-yeild point. Different types of hybrid composites with continuous layers have been studied to produce pseudo-ductile tensile behaviour. However, most hybrid material studies to date have been focused on Uni-Directional (UD) laminates which are not usually applied in industry due to poor transverse mechanical properties. To make a multi-directional hybrid laminate, different approaches can be selected to mix different fibre types with different fibre orientations. In this paper, two approaches are presented and compared: (i) UD hybrid sublaminates used as the building blocks of hybrid laminates and (ii) dispersed orientation in which non-hybrid multi-directional sublaminates with different fibre types are stacked up. It is shown that the method of dispersed orientation significantly helps to reduce interlaminar stresses at the free edges of the tensile samples and therefore supresses free-edge delamination.

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Jalalvand M, Fotouhi M, Czél G, Wisnom MR. Avoiding free edge delamination in quasi-isotropic pseudo-ductile hybrid laminates - by material dispersion or layer angle dispersion? In ECCM 2016 - Proceeding of the 17th European Conference on Composite Materials. 2016