A study on 3D Carbon Braided Composite (original) (raw)
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Mechanical properties of braided reinforced composites
2006
The current work is concerned with the development of braided reinforced composites for civil engineering applications. The research study aims at understanding the mechanical behaviour of core reinforced braided fabrics. Various samples have been produced using polyester fibres, for the production of the braided fabrics, and glass, carbon, polyethylene and sisal fibres, for the core reinforcement. The results of the tensile tests carried out in the various samples of reinforced braided fabrics obtained are presented and discussed. Moreover, the influence of the testing conditions and of the braiding angle are also studied. In order to produce braided reinforced composite rods to be used as concrete reinforcement, a special technique has been developed using a standard vertical braiding machine. The tensile and bending properties of braided reinforced composite rods have been evaluated and the results obtained are presented, discussed and compared with those of conventional materials, such as steel.
Failure analysis of triaxial braided composite
Composites Science and Technology, 2009
This study focuses on the description of damage and failure behaviour of triaxial braided carbon/epoxy composites under tension. The tensile tests were instrumented with optical surface strain and acoustic emission measurements. Damage was observed using X-ray and microscopy. The damage develops in two stages: (1) intra-yarn cracking: increase of the crack density and crack length, (2) local inter-yarn delamination and conjunction of the intra-yarn cracks. Statistics of crack sizes at both stages were collected and the 3D geometry of cracks was reconstructed. A finite element model of the unit cell of the textile reinforcement is used to predict damage initiation and crack orientation using Puck's criterion. Progressive damage and stiffness deterioration is modelled using the degradation scheme of Murakami-Ohno and the damage evolution law of Ladeveze, applied to the average stress state of the yarns. Good agreement with experimental damage initiation threshold and non-linear tensile diagrams is found both for loading in fibre and off-axis directions.
Materials
In this work, the tensile, compressive, and flexural properties of three types of 3D woven composites were studied in three directions. To make an accurate comparison, three 3D woven composites are made to have the same fiber volume content by controlling the weaving parameters of 3D fabric. The results show that the 3D orthogonal woven composite (3DOWC) has better overall mechanical properties than those of the 3D shallow straight-joint woven composite (3DSSWC) and 3D shallow bend-joint woven composite (3DSBWC) in the warp direction, including tension, compression, and flexural strength. Interestingly their mechanical properties in the weft direction are about the same. In the through-thickness direction, however, the tensile and flexural strength of 3DOWC is about the same as 3DSBW, both higher than that of 3DSSWC. The compressive strength, on the other hand, is mainly dependent on the number of weft yarns in the through-thickness direction.
On the behaviour of flattened tubular Bi-axial and Tri-axial braided composites in tension
Composite Structures, 2021
The effect of braid angle and number of axial tow insertions on the behavior of flattened tubular braided composites (carbon fibre/epoxy resin) has been investigated. Two type of braids i.e. bi-axial and tri-axial (i.e. 6 and 12 inserted axial tows), for three braid angles (35°, 45°and 55°), have been studied. The stress-strain curve for the bi-axial braided composites is pseudo-ductile in nature, with a smooth transition into a plateau region at low strains, accompanied by necking of the composite. By contrast, the tri-axial braided composites show an initially high peak stress, related to the deformation and fracture of the axial tows, and subsequent plateaulike behaviour accompanied by neck formation, the extent of which appears to be determined by the strainto-failure of the composite. For the bi-axial braids, an increase in braid angle produced decreased strength, axial modulus and specific energy absorption, but an increase in strain to failure. Inserted axial tows produced increased strengths and Young's moduli, but a decrease in specific energy absorption (except for 55°) and strain to failure. In all cases, the braided composites outperformed the specific energy absorption of aluminium.
Analysis of Mechanical Properties of Three- Dimensionally Braided Composite
This research uses the Finite Element Analysis software ANYSYS to build a four step 3D-braided composite micromechanical model and analyses its properties. With the assumption that the fibre bundle is transversely isotropic and the matrix is isotropic, the macroscopic elastic constants of 3Dbraided composites were simulated, and the elastic constants versus the braiding angles and fibre volume fraction were analysed. The presence of reinforcement along the thickness direction in three-dimensionally braided composites, increases the through thickness stiffness and strength properties, more so the three-dimensionally preforms can be manufactured with numerous complex architecture variations to meet the needs of specific application. Among the advantages of this technique (FEM) is simplicity and the ability to model and study the response of complex shapes subjected to complex
Towards the deformability of triaxial braided composite reinforcement during manufacturing
Composites Part B: Engineering, 2019
At the first stage of the Resin Transfer Molding (RTM) process, the composite reinforcements preforming is a complicated physical stage including complex deformability behaviours. In this paper, the deformability of carbon triaxial braided fabrics, one of the advanced composite reinforcements, is originally investigated. The yarns sliding along both longitudinal and radial yarn directions is the primary preforming behaviour, which is quite distinct from the woven fabrics preforming. Moreover, the yarns sliding along two yarn directions present quite a difference between the axial and bias yarns. The manufacturing defects during the triaxial braided fabrics preforming such as fibre vacancies, buckling and gaps are also discussed. At last, the geometrical models to predict maximum sliding along longitudinal yarn direction are described based on basic preforming parameters. Besides, the criterion preventing fibre vacancies are also proposed.
Fabrication, Testing and Analysis of Braided and Short fibre reinforced Jute Epoxy Bio-composite
2020
Abstract: The main objective of this paper is to fabricate and test the Jute-Epoxy braided as well as short fibre reinforced composite which is of low cost, low density, high specific strength, no health risks, renewable, environment friendly and lower energy requirement for processing. The jute fibres used have undergone alkali treatment to improve their properties and blended with epoxy resin and cured. The later stage of our work deals with the Tensile Test of both types of specimens ,Impact & Flexural test of Braided composite according to the ASTM standards for Plastics. Further an extensive comparison of braided & short fibre composite has been done along with finite element analysis to validate the results.
Mechanical behaviour of natural fibre reinforced thermoplastic braided composite rods
In the present work, braided composite rods (BCRs) have been developed through braiding of polypropylene (PP) fibres around an axially oriented core, made of a mixture of PP and sisal fibres and subsequent consolidation of the produced structures under heat and pressure. Tensile properties of these BCRs were characterized. The effect of alkali treatment of sisal fibres on their surface morphology as well as mechanical properties of sisal fibres and produced BCRs was thoroughly investigated. It was observed that the tensile properties of developed BCRs improved strongly with the increase in sisal fibre vol.% and moreover, the alkali treatment improved the tensile properties of sisal fibre and their interfacial interactions with PP matrix, leading to enhanced tensile behaviour of BCRs.
Characterization and Structural Behavior of Braided Composites
2009
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Applied Composite Materials, 2013
The performance of 2D biaxially and triaxially reinforced braided carbon fibre composites under dynamic loading is evaluated in the presented study. The accurate manufacturing of tensile specimen made of braided sleeves is explained particularly with regard to efficiency and reproducibility. In order to determine reliable strain rate dependent properties, the high-speed testing procedure is discussed. Using five materials, the parameter identification is described and relevant material data is provided. The measured stiffnesses and strengths are used to predict the nonlinear stress-strain behaviour with an earlier proposed phenomenological damage model for textile composites. The gained orthotropic property-profile provides the input parameters for a numerical analysis of braided composite components using the calibrated model.