Orientation-dispersed pseudo-ductile hybrid composite laminates – A new lay-up concept to avoid free-edge delamination

Jalalvand, Meisam; Fotouhi, Mohamad; Wisnom, Michael R

doi:10.1016/j.compscitech.2017.10.011

Cited by 27 publications

(15 citation statements)

References 29 publications

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“…In all the configurations, free edge delamination, an undesirable damage mode in previously investigated orientation-blocked hybrids [29], was successfully suppressed due to the orientation-dispersed design [30] that produces lower energy release rates at the free-edges of the laminates.…”

Section: Un-notched Resultsmentioning

confidence: 93%

“…Early work on pseudo-ductile composites [22][23][24][25][26][27][28] reported that by combining different types of thin-ply carbon fibres and standard glass fibres, an optimised gradual failure process can be achieved in tension that can avoid catastrophic failure. In these studies, unidirectional hybrids were used to generate pseudoductile behaviour, with the concept then applied on quasi-isotropic (QI) laminates [29][30][31]. It was found that by changing the relative and absolute thickness of the carbon layer as well as the material properties, three damage mechanisms, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…This is due to high thickness of each sub laminate in this orientation-blocked concept, resulting in high-energy release rates for free-edge delamination. A different orientation-dispersed concept was recently introduced [30] in which non-hybrid multi-directional sublaminates with different fibre types are stacked up to solve the free edge delamination by reducing the thickness of material of the same orientation. It was shown that the orientation-dispersed concept significantly reduces the energy release rate associated with stresses at the free edges of the tensile samples and therefore supresses free-edge delamination.…”

Section: Introductionmentioning

confidence: 99%

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Notch insensitive orientation-dispersed pseudo-ductile thin-ply carbon/glass hybrid laminates

Fotouhi

Jalalvand

Wisnom

2018

Composites Part A: Applied Science and Manufacturing

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Notch sensitivity, free edge delamination and brittle failure are limiting factors for the wider use of conventional composite laminates. In our previous study, a hybrid layup concept with the different materials blocked together but with dispersed orientations was successfully used to design pseudo-ductile hybrid composites with no free-edge delamination. This study introduces a comprehensive set of designed and characterised orientation-dispersed pseudoductile thin-ply hybrid composites to address notch sensitivity, another important limiting factor in conventional composite laminates. Un-notched, open-hole and sharp notched tension tests were performed on three different thin-ply carbon/glass hybrid configurations. The investigated laminates showed a successful pseudo-ductile un-notched behaviour with improved notch-insensitivity and suppression of free-edge delamination that was an undesirable damage mode in previously investigated hybrids with plies of the same orientation blocked together. This notch insensitivity results from subcritical damage in the laminates due to the pseudo-ductile damage mechanisms, i.e. dispersed delamination and fragmentation. These damage mechanisms can eliminate stress concentrations near the notch and suppress the conventional damage mechanisms that govern the notched response of the laminates.

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Section: Un-notched Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Notch insensitive orientation-dispersed pseudo-ductile thin-ply carbon/glass hybrid laminates

Fotouhi

Jalalvand

Wisnom

2018

Composites Part A: Applied Science and Manufacturing

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“…[22][23][24][25][26][27] The hybridization of different fibers is a successful approach to address the lack of the ductility in composites. 28 As reported by Fotouhi et al 29 and Jalalvand et al, 30 hybridization is one of the methods that can introduce gradual failure in composites and also can achieve more cost-effective materials. Mixing the fibers can be done in different levels such as intermingled continuous fibers, 31 intermingled aligned short fibers, 32 interlayer or sandwiched layers 33 and intralayer.…”

Section: Introductionmentioning

confidence: 92%

Mechanical characterization of hybrid composites based on flax, basalt and glass fibers

El‐baky

Attia

Abdelhaleem

et al. 2020

Journal of Composite Materials

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An experimental study on tensile, flexural and impact properties of flax-basalt-glass reinforced epoxy hybrid composites is presented in this paper. Test specimens were fabricated by vacuum bagging process. The effects of reinforcement hybridization, fiber relative amounts and stacking sequence on the mechanical properties were investigated. Morphological studies of the fabricated and fractured surfaces through thickness were performed using scanning electron microscopy. Results showed that the developed hybrid composites display enhanced tensile, flexural and impact performance as compared with flax reinforced epoxy composite. The flexural strength increases when partial laminas from flax/epoxy laminate are replaced by basalt/epoxy and/or glass/epoxy laminas. Also, it is realized that incorporating high-strength fibers, i.e. glass or basalt, to the outer layers of the composite leads to higher flexural resistance, whilst the opposite was noticed for tensile properties. The fabricated hybrids were found to have economical and specific mechanical properties benefits. Fiber-relative amounts and stacking sequence have great effects on the mechanical properties. The mechanical properties of hybrid laminates are proven to be highly dependent on the position of the flax layers within the hybrid composite. The Hybridization with basalt and/or glass fibers is an effective method for enhancing the mechanical properties of flax/epoxy composites.

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“…In this method, two types of plies with different fibers are co-cured to achieve a desired performance, and to produce a more cost-effective material [15,16]. Most of the work done to-date on hybrid composites has concerned hybrids under tensile [17,18], bending and compression loadings [19][20][21]. There are also some studies on hybrid composites when subjected to indentation and impact loadings [22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Stacking Sequence on the Impact Response of Carbon-Glass/Epoxy Hybrid Composites

Ali¹,

Akrami²,

Fotouhi³

et al. 2020

FU Mech Eng

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This paper investigates low-velocity impact response of Quasi Isotropic (QI) hybrid carbon/glass fiber reinforced polymer composites with alternate stacking sequences. Cross-ply woven carbon and glass fibers were used as reinforcing materials to fabricate sandwiched and interlayer hybrid composites. For comparison, the laminates containing only-carbon and only-glass fibers were also studied. Drop weight test was used to impact the samples. The images captured by a normal camera demonstrated that localized damages (delamination) existed within plies. The hybrid laminates had smaller load drops, smaller maximum deflection, and higher maximum load compared to the single fiber laminates. In addition, carbon outside interlayer hybrid laminate showed the highest maximum load and energy absorption, showing the significant dependence of the impact performance on hybridization and stacking sequence. It was concluded that a hybrid composite would help improve impact performance of laminated composites compared to non-hybrid composites if they are properly designed.

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Orientation-dispersed pseudo-ductile hybrid composite laminates – A new lay-up concept to avoid free-edge delamination

Cited by 27 publications

References 29 publications

Notch insensitive orientation-dispersed pseudo-ductile thin-ply carbon/glass hybrid laminates

Notch insensitive orientation-dispersed pseudo-ductile thin-ply carbon/glass hybrid laminates

Mechanical characterization of hybrid composites based on flax, basalt and glass fibers

Effect of the Stacking Sequence on the Impact Response of Carbon-Glass/Epoxy Hybrid Composites

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