Effect of braid structure on yarn cross-sectional shape

Lyons, Jason; Pastore, Christopher M.

doi:10.1007/bf02902997

Cited by 18 publications

(7 citation statements)

References 3 publications

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“…If analytical relations predicting the cover factor in function of process parameters are intensely described in literature [2,8,14–20], the linear mass of braids is insufficiently studied. Based on models proposed for cover factor [8], a model of linear mass of braids can be defined taking into account the properties of yarns (linear density, number of yarns) and their position in braids (braiding angle, crimp).…”

Section: The Geometrical Properties Of Braids Manufacturedmentioning

confidence: 99%

“…The braiding angle is the angle between the longitudinal direction of the braided preform and the deposited fibres. This braiding angle is a key parameter in kinematic analysis [2,8,14–20] of the process and also on its influence on the mechanical behaviour of braided composite [1,9–11,21–43]. Axial yarns could be added along the mandrel axis in this case braid is called a triaxial braid.…”

Section: Introductionmentioning

confidence: 99%

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The tensile behaviour of biaxial and triaxial braided fabrics

Duchamp

Legrand

Soulat

2016

Journal of Industrial Textiles

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The tensile behaviour of braid reinforcement is classically described by the behaviour of composite elaborated from these reinforcements. Few studies concern the tensile behaviour of braided fabrics. In this paper biaxial and triaxial braids are manufactured on a braiding loom. The evolution of key parameters as linear mass and braiding angle in function of process parameters is presented. Braid reinforcements are characterized in uniaxial tensile. The mechanical behaviour is analysed and compared in function of the braiding angle, but also different kinds of braid are considered. A specific behaviour called ''double-peak'' is identified for triaxial braids which have a higher braiding angle. The evolution of the braiding angle measured during tensile tests gives a comprehension on the mechanical behaviour of dry braids. Associated with this experimental study, an analytical model is also proposed, to predict mechanical properties of braid reinforcements.

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Section: The Geometrical Properties Of Braids Manufacturedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The tensile behaviour of biaxial and triaxial braided fabrics

Duchamp

Legrand

Soulat

2016

Journal of Industrial Textiles

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“…In zero degree yarns of triaxial braids, the elliptical shapes are dominating. Due to this uncertainty, some authors often describe the cross-section either as lenticular, or as elliptical (compare [7][8][9]). …”

Section: Characteristicsmentioning

confidence: 99%

Characterization of Biaxial and Triaxial Braids: Fiber Architecture and Mechanical Properties

et al. 2011

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Biaxial and triaxial carbon fiber braids with off-axis braiding angles of 30°, 45°a nd 55°are characterized with respect to their fiber architecture. All braids are produced on a round mandrel with constant cross section. Detailed geometric information on the different braids, like roving dimensions, roving shapes and the degree of nesting is given. The findings from measurements in photomicrographs are used to construct meso-model yarn architectures at the unit cell level which are then analyzed with the WiseTex software (Lomov et al. Compos. Sci. Technol. 60:2083-2095, 2000. The results of the models' analysis with TexComp and comparison of mechanical properties with tests are consistent and essential for further steps in predictive modeling. Predictive modeling was also performed for biaxial braids based on the packing density in the material and parameters of the braiding process. The good conformance of the predictive models gives a validated starting point for development of braided structures concerning stiffness behavior. In addition, the information about the fiber architecture can be used for failure analysis on unit cell level.

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“…[19] 2D braiding structures can be open or closed meshed architectures which are characterized by coverage factor that means the measure of the surface area enclosed by strands [20]. Since the number and width of fiber (such as 1K, 3K, 6K, 12K, 24K) cannot be changed easily, the coverage factor is obtained by changing the braiding angle corresponding to the change of mandrel diameter [21]. Equation 2 is given for tubular mandrels.…”

Section: B Amentioning

confidence: 99%

Mechanical Investigation of Epoxy Based High-Strength Carbon Fiber Braided Composites Modified with Silane Coupling Agents

Eryılmaz

Sancak

2021

Preprint

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Braiding technique is one of the most cost-effective and versatile methods to manufacture braided preforms for producing textile reinforced composites which have been utilized in a number of applications such as aerospace and automotive sectors. Carbon fiber is one of the most common reinforcing fibers having high strength and modulus used in high-performance composites. In this study, epoxy resin was modified with 3 – aminopropyltriethoxysilane (APTES) and 3 – aminopropylmethyldimethoxysilane (APMDMS) in order to enhance interfacial adhesion between matrix and carbon fiber. Composites were produced by vacuum-assisted resin infusion method (VARIM) using braided carbon fabrics and epoxy resin which was treated with silane at different concentrations (from 0.0% to 1.0%). Braided fabrics were manufactured from a high-strength standard modulus type of carbon fiber and using a radial braiding machine. According to the mechanical results, the ideal (optimum) concentration of APTES and APMDMS for the matrix modification has been around 0.5 wt% of the epoxy system. Also, the mechanical properties of APTES-treated epoxy composites are slightly higher than those of APMDMS-treated epoxy composites at the same concentration. When it is compared to silane untreated composite, 0.5 wt% of APTES/APMDMS silane treated epoxy/carbon braided composites have led to an increase of 7.71/6.16 and 7.65/6.05 % in tensile and flexural strength while the corresponding increase has resulted in 17.48/13.51 and 16.63/13.33 % in terms of tensile and flexural modulus, respectively. Impact testing results indicate that 0.5 wt% of APTES and APMDMS composites are improved 6.87 and 4.31 % compared to untreated composites, respectively.

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Effect of braid structure on yarn cross-sectional shape

Cited by 18 publications

References 3 publications

The tensile behaviour of biaxial and triaxial braided fabrics

The tensile behaviour of biaxial and triaxial braided fabrics

Characterization of Biaxial and Triaxial Braids: Fiber Architecture and Mechanical Properties

Mechanical Investigation of Epoxy Based High-Strength Carbon Fiber Braided Composites Modified with Silane Coupling Agents

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