Flexural and torsional behaviour of biaxial and triaxial braided composite structures

Potluri, Prasad; Manan, Abdul; Francke, M.; Day, Richard

doi:10.1016/j.compstruct.2006.04.046

Cited by 88 publications

(64 citation statements)

References 5 publications

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“…Moreover, tensile experimental results were in good agreement with those of similar braided structures in the literature [19,27,28]. Similar reports on the bending behavior were also observed in some research works [25,26]. All in all, overbraiding the unidirectional core in pultruded rods, leads to a considerable improvement in their shear modulus and at the same time, a drop in their tensile and flexural properties compared to their UD pultruded counterparts with the same fiber volume fraction and diameter.…”

Section: Resultssupporting

confidence: 79%

“…0.77, shear modulus is about 1.5 times higher than that for UD rod. Although there are a few works investigating the properties of BP rods, comparing the experimental results to those of similar braided structures in the literature shows good agreements [22,25,26]. Results from tensile and bending tests showed all rods had linear behavior in tension and flexure.…”

Section: Resultsmentioning

confidence: 76%

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An experimental study on mechanical properties of GFRP braid-pultruded composite rods

Ahmadi¹,

Johari²,

Sadighi³

et al. 2009

Express Polym. Lett.

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Abstract. In this work, a conventional textile braiding machine was modified and added to a pultrusion line in order to produce glass fiber reinforced composite rods by braiding-pultrusion technique. Braid-pultruded (BP) rods were produced with three braid roving linear densities and also with three different braid angles. To study the influence of overbraiding on mechanical properties of pultruded rods, unidirectional (UD) rods, without braided fabric, were produced, as well. All rod types were subjected to tensile, bending and torsion tests. The experimental results showed that BP rods have considerably higher shear modulus, but lower tensile modulus and flexural rigidity than those of UD pultruded rods, when fiber volume fraction is kept constant. Moreover, rods produced with higher braid roving linear densities had better torsional, but lower tensile and flexural properties. The highest shear modulus was observed in BP rods with braid angle of 45°.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 76%

An experimental study on mechanical properties of GFRP braid-pultruded composite rods

Ahmadi¹,

Johari²,

Sadighi³

et al. 2009

Express Polym. Lett.

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“…Several modelling approaches exist for predicting the effect of waviness on the elastic properties of braided composites [21][22][23]. By comparing the experimental results to equivalent laminates without crimp, however, the possible knock-down of mechanical properties can be quantified directly.…”

Section: Analytical Modellingmentioning

confidence: 99%

Damage and failure of triaxial braided composites under multi-axial stress states

Wehrkamp-Richter

Hinterhölzl

Pinho

2017

Composites Science and Technology

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Damage and failure of triaxial braided composites under multi-axial stress states was investigated. In order to introduce different multi-axial stress states in the material, uni-axial tensile tests were performed at different off-axis orientations. Three braid architectures, comprising braiding angles of 30 • , 45 • and 60 • were each loaded parallel to their axial, transverse and braid yarn direction. Digital image correlation measurement techniques were used to quantify the effects of the textile architecture and its heterogeneity on the strain field, to identify and locate constituent failure mechanisms and to investigate damage initiation and development. In order to identify the driving physical mechanisms behind the material non-linearity, the evolution of the damage variable and the accumulated inelastic strain was quantified using incremental loading/unloading experiments. A high-speed camera was employed in order to study the dynamic nature of catastrophic failure. The triaxial braids within this study exhibited severe non-linearities in the mechanical response before final failure as a result of extensive matrix cracking. While we found the underlying textile architecture to slightly reduce the elastic properties compared to equivalent tape laminates, it functions as a natural crack arresting grid. As a result of this mechanism, braids under certain load conditions were capable of withstanding a higher strain to failure, even if a large portion of the specimen surface was saturated with matrix cracks. The accompanying mechanical behaviour can be desirable in the design of crash absorbing or pseudo-ductile materials. An additional failure mode intrinsic to the textile architecture was encountered for loading in the heavily undulated braid yarn direction. Due to yarn straightening and out-of-plane movements, braided composites were found to fail as a result of large scale delaminations accompanied by progressive fibre bundle pull-out.

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“…Complex shapes can be easily produced while the performance can be controlled through the regulation of the braid, crimp angle and other geometrical characteristics. Braided tubes exhibit a superior structural strength due to the fact that the interlacements act as crack arrests in contrast to laminated and filament wound tubes where the cracks run along the fibres [3,4].…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Investigation of the Hydrostatic Performance of Fibre Reinforced Tubes

et al. 2016

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The increasing demands in subsea industry such as oil and gas, led to a rapidly growing need for the use of advanced, high performance, lightweight materials such as composite materials. E-glass fibre laminated pre-preg, filament wound and braided tubes were tested to destruction under hydrostatic external pressure in order to study their buckling and crushing behaviour. Different fibre architectures and wind angles were tested at a range of wall thicknesses highlighting the advantage that hoop reinforcement offers. The experimental results were compared with theoretical predictions obtained from classic laminate theory and finite element analysis (ABAQUS) based on the principal that the predominant failure mode was buckling. SEM analysis was further performed to investigate the resulting failure mechanisms, indicating that the failure mechanisms can be more complex with a variety of observed modes taking place such as fibre fracture, delamination and fibre-matrix interface failure.

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Flexural and torsional behaviour of biaxial and triaxial braided composite structures

Cited by 88 publications

References 5 publications

An experimental study on mechanical properties of GFRP braid-pultruded composite rods

An experimental study on mechanical properties of GFRP braid-pultruded composite rods

Damage and failure of triaxial braided composites under multi-axial stress states

Numerical and Experimental Investigation of the Hydrostatic Performance of Fibre Reinforced Tubes

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