Damage analysis of pseudo-ductile thin-ply UD hybrid composites – A new analytical method

Jalalvand, Meisam; Czél, Gergely; Wisnom, Michael R

doi:10.1016/j.compositesa.2014.11.006

Cited by 155 publications

(191 citation statements)

References 21 publications

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“…The most straightforward interply (or interlayer) hybridisation [5] was performed within this study because this method showed promising scope for pseudo-ductility [13] and it can be realised using existing prepreg materials which keeps specimen manufacturing simple. Strong potential for demonstrating pseudo-ductility while maintaining high performance in UD composites was shown earlier by the authors [13]- [15] using emerging thin ply prepregs to supress delamination in interlayer hybrid configurations. The main focus of researchers investigating thin-ply composites [16]- [18] was to explore the change in damage modes due to more dispersed lay-up designs.…”

Section: Introductionmentioning

confidence: 92%

Demonstration of pseudo-ductility in unidirectional hybrid composites made of discontinuous carbon/epoxy and continuous glass/epoxy plies

Czél¹,

Jalalvand

Wisnom

2015

Composites Part A: Applied Science and Manufacturing

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A new, partially discontinuous architecture is proposed to improve the mechanical performance of pseudo-ductile, unidirectional (UD) interlayer carbon/glass hybrid composites. The concept was successfully demonstrated in different laminates with high strength and high modulus carbon and S-glass epoxy UD prepregs. The novel hybrid architecture provided pseudo-ductile tensile stress-strain responses with a linear initial part followed by a wide plateau and a second linear part, all connected by smooth transitions. The best hybrid configuration showed 60% improvement in modulus compared to pure glass, 860 MPa plateau stress and 2% pseudo-ductile strain. The initial modulus, the plateau stress and the overall tensile stress-strain response of each specimen configuration were predicted accurately

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Section: Introductionmentioning

confidence: 92%

Demonstration of pseudo-ductility in unidirectional hybrid composites made of discontinuous carbon/epoxy and continuous glass/epoxy plies

Czél¹,

Jalalvand

Wisnom

2015

Composites Part A: Applied Science and Manufacturing

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“…Most of the strength and stiffness of each layer is coming from the 0 layers and fragmentation/failure of this layer means a big drop in the stiffness of the remaining parts or failure of the whole laminate. Interfacial fracture toughness between the glass and carbon layers, G IIc , was assumed to be 1 N/mm [18]. The damage mode map with calculated boundaries between the different regions is illustrated in Fig.…”

Section: Tablementioning

confidence: 99%

“…Pseudo-ductile response is achieved by suppression of catastrophic delamination and appearance of damage modes of (i) fragmentation in the carbon plies and (ii) local delamination, before the final failure of the high strain glass plies. This has been done through using damage mode maps, similar to those for UD laminates [18]. These show how the damage depends on the relative and absolute thickness of the different materials.…”

Section: Materials and Specimen Designmentioning

confidence: 99%

High performance quasi-isotropic thin-ply carbon/glass hybrid composites with pseudo-ductile behaviour in all fibre orientations

Fotouhi

Jalalvand

Wisnom

2017

Composites Science and Technology

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a b s t r a c tThis study exploits the potential of thin-ply carbon/glass hybrid laminates to generate high performance Quasi-Isotropic (QI) composite plates that show pseudo-ductility in all fibre orientations under tensile loading, overcoming the inherent brittleness of conventional composites. Two types of QI lay-ups with 45 and 60 intervals, i.e. [45/90/-45/0] and [60/-60/0], were used to fabricate novel architectures of a QI T300-carbon laminate sandwiched between the two halves of a QI S-glass laminate. The fabricated plates were then loaded in all their fibre orientations. The laminates were designed by choosing an appropriate ratio of the carbon thickness to the laminate thickness using a robust analytical damage mode map. The experimental results verified the analytical predictions and showed a desirable pseudo-ductile failure in all the fibre orientations. Microscope images taken through the laminates thickness showed fragmentations (fibre fractures in the carbon layer) appearing only in the 0 carbon plies. A hybrid effect was observed, with an increase in strain and stress to failure of the carbon fibres, which was found to be dependent on the stiffness of the plies separating the 0 carbon plies and the plies adjacent to the 0 carbon plies. Altering the stacking sequence changes the stiffness of the separator and adjacent plies, therefore, leads to changes in the pseudo-ductile characteristics such as the initiation and final failure strains.

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“…Recently, gradual failure and pseudo-ductile stress-strain response were observed in carbon/glass composite materials [21][22][23][24][25]. Their results showed that as the failure strain of carbon fibres is lower than that of the glass fibres, the first damage occurs in the carbon layer and the following failure mechanisms in the specimen are influenced by the interfacial toughness, material properties, and the thickness of the layers.…”

Section: Introductionmentioning

confidence: 99%

Acoustic emission monitoring of thin ply hybrid composites under repeated quasi-static tensile loading

Fotouhi¹,

Suwarta²,

Jalalvand³

et al. 2018

FME Transaction

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Damage analysis of pseudo-ductile thin-ply UD hybrid composites – A new analytical method

Cited by 155 publications

References 21 publications

Demonstration of pseudo-ductility in unidirectional hybrid composites made of discontinuous carbon/epoxy and continuous glass/epoxy plies

Demonstration of pseudo-ductility in unidirectional hybrid composites made of discontinuous carbon/epoxy and continuous glass/epoxy plies

High performance quasi-isotropic thin-ply carbon/glass hybrid composites with pseudo-ductile behaviour in all fibre orientations

Acoustic emission monitoring of thin ply hybrid composites under repeated quasi-static tensile loading

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