Ductile deformation mechanisms and designing instructions for integrated woven textile sandwich composites

This paper is concerned with a theoretical and experimental verification of a micromechanical model of newly developed sandwich panels denoted as 3D integrated woven sandwich composite panels. The integrated hollow core was made of a pile of 3D bars with a special configuration. Integrated woven sandwich composite panels consist of two fabric faces which were interwoven by pile fibers and therefore a very high skin core debonding resistance was obtained. With the objective of qualifying the mechanical properties of these structures, fairly extensive experimental research was carried out by investigators. Although some numerical methods have been developed to predict the mechanical behaviors of these structures, there are less analytical models in this area. Due to the computational difficulties and the time consuming nature of the finite element method, in the present study, a new micromechanics analytical model has been suggested for predicting the compressive strength of integrated woven sandwich composites. In order to evaluate the proposed model, fabricated samples with different pile heights and pile distribution densities were subjected to flatwise compression tests. The results show that compressive properties of integrated woven sandwich composite

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“…Equations (23) and (24) are used for transformation of force and moment vectors in the local coordinate system in the kth sub-element.…”

Section: Stress Analysismentioning

confidence: 99%

Micromechanical modelling of the compression strength of three-dimensional integrated woven sandwich composites

Mirdehghan

Nosraty

Shokrieh

et al. 2018

Journal of Industrial Textiles

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“…Different production methods are applicable for fabricating such engineered structures, of which weaving technology is more conventional. This claim could be approved by finding numerous investigations into the mechanical performances in the case of 3D woven sandwich composites [17,23–25]. It was revealed that the skin-core delamination resistance of 3D woven sandwich materials as well as their failure strength are much higher than other commonly used sandwich composites.…”

Section: Introductionmentioning

confidence: 99%

Compression load-carrying capacity of 3D-integrated weft-knitted spacer composites

Hassanzadeh

Hasani

Zarrebini

2017

Jnl of Sandwich Structures & Materials

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Recent developments in composite manufacturing have been resulted in formation of newly-known 3D integrated weft-knitted fabrics which can be used as the composites’ reinforcing materials. In this paper, the compression-resistivity of 3D composite panels reinforced with these newly designed 3D textile-preforms from E-glass fibers has been studied. Following this research, the composites mechanical functionality under flatwise and edgewise compression loadings was evaluated. Using VIP method, three groups of glass/epoxy composite with different core thicknesses and structural geometries were prepared. It was concluded that the compressive strength of the flat-wisely loaded samples would significantly decrease by increasing the thickness. Moreover, changing the composites’ geometrical shape leads to some changes in failure mode; in this regard, the produced single-decker U-shaped panels only suffer from the pure buckling failure, while the double-decker U-shaped panel failed due to a combination of facing bending stress, core shear stress, and buckling failure. Thickness changes are not as effective as structural geometry changes on the panels’ compress-resistivity under edgewise compression. As compared with the conventional 3D woven sandwich composites, it was approved that mechanical functionality of the produced 3D integrated weft-knitted spacer panels is completely improved so that they can be considered as good alternatives especially in building constructions.

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“…Fan et al. [13,14] fabricated different composites reinforced with woven spacer fabrics in order to investigate their failure mechanisms and energy absorption abilities. Brandt et al.…”

Section: Introductionmentioning

confidence: 99%

Flexural behavior of composites reinforced with innovative 3D integrated weft-knitted spacer fabrics

Azadian

Hasani

Shokrieh

2017

Journal of Industrial Textiles

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This paper undertakes to study the flexural behavior of 3D integrated weft-knitted spacer composites, under three-point bending. The integrated-knitted spacer fabrics were produced with various cross-sectional shapes on a computerized flat-knitting machine utilizing electrical grade glass (E-glass) fibers. The sandwich composites were manufactured by vacuum-assisted resin transfer molding using unsaturated polyester resin. Continuing the process, hand lay-up method was used to reinforce the face sheets of fabricated sandwich structure with glass woven fabrics. Bending performance of the produced composites was compared with polyurethane foam core sandwich composites. The results revealed that the cross-sectional shape has significant effect on the bending performance of the 3D integrated weft-knitted spacer composites. Also, the spacer reinforced composite with V-shape cross-section has the highest bending stiffness than composites with U-shape cross-section as well as polyurethane foam core sandwich composite. The failure modes of 3D integrated weft-knitted spacer composites include: core shear failure, compression failure of upper face sheet and tensile failure of lower face sheet.

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Ductile deformation mechanisms and designing instructions for integrated woven textile sandwich composites

Cited by 68 publications

References 11 publications

Micromechanical modelling of the compression strength of three-dimensional integrated woven sandwich composites

Micromechanical modelling of the compression strength of three-dimensional integrated woven sandwich composites

Compression load-carrying capacity of 3D-integrated weft-knitted spacer composites

Flexural behavior of composites reinforced with innovative 3D integrated weft-knitted spacer fabrics

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