Modelling the deformability of biaxial non-crimp fabric composites

Harrison, Philip G.; Yu, Wai; Long, Andrew

doi:10.1533/9780857092533.2.144

Cited by 7 publications

(5 citation statements)

References 27 publications

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“…Any small misalignment will produce tensile or compressive forces in the fiber directions, and as a consequence, a large scatter in the measured force readings will appear [ 21 ]. However, the first shear cycle for fabrics showed extremely irregular behavior and evidence of tension in the fibers in the frame [ 19 ]; this type of behavior was labeled in [ 19 , 34 ] as ‘bad tests’, and normally, such tests were discarded from the data processing. In addition, when repeating the test for the same fabric, we came up with some extreme irregular cases from the general trend, which were not included in the analysis in this paper.…”

Section: Methodsmentioning

confidence: 99%

Characterization and Analysis of In-Plane Shear Behavior of Glass Warp-Knitted Non-Crimp Fabrics Based on Picture Frame Method

et al. 2018

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Glass warp-knitted fabrics have been widely used as complex structural reinforcements in composites, such as wind turbine blades, boats, vehicles, etc. Understanding the mechanical behavior and formability of these textiles is very necessary for the simulation of forming processes before manufacturing. In this paper, the shear deformation mechanics of glass warp-knitted non-crimp fabrics (WKNCF) were experimentally investigated based on a picture frame testing apparatus equipped to a universal testing machine. Three commercially available fabrics of WKNCFs were tested for four cycles by the picture frame method. The aim was to characterize and compare the shear behavior of relatively high areal density fabrics during preform processing for composites. The energy normalization theory was used to obtain the normalized shear force from the testing machine data; then, the shear stress against the shear angle was fitted by cubic polynomial regression equations. The results achieved from the equations demonstrated that the in-plane shear rigidity modulus was associated with the shear angle. The effect of the shearing cycles and stitching pattern on shear resistance was also analyzed.

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Section: Methodsmentioning

confidence: 99%

Characterization and Analysis of In-Plane Shear Behavior of Glass Warp-Knitted Non-Crimp Fabrics Based on Picture Frame Method

et al. 2018

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“…The first uses 3-D geometries of a variety of levels of difficulty in forming in an attempt to define some practical forming limit, with the most commonly used trial geometry being a hemisphere, although more practically based work tended to use a wider range of geometries (Wang et al, 1999). between non-crimp and standard woven fabrics) that do not show up well in the more standardised tests for in-plane deformations (Harrison et al, 2011). Its advantage lies in that it can at best capture not just the level of deformation but also how practically difficult it is to develop that deformation in a controlled and 100 mm Figure 5.2 Mapping tows to 3-D geometry.…”

Section: Fundamental Deformation Modes Of Composites Reinforcementsmentioning

confidence: 99%

Draping processes for composites manufacture

Potter

Ward

2015

Advances in Composites Manufacturing and Process Design

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“…The development of numerical approaches to model the complex behavior of NCFs represents an attractive method to understand and predict their deformation behavior. Predictive models can be implementedas proposed by Harrison et al [12] in order to reduce costly and time-intensive material characterization. Moreover, they enable to study the influence of manufacturing process parameters in a wide range.…”

Section: Introductionmentioning

confidence: 99%

Virtual Description of Non-Crimp Fabrics at the Scale of Filaments Including Orientation Variability in the Fibrous Layers

et al. 2020

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A numerical description of dry non-crimp fabrics is proposed at the scale of the filaments using a commercially available finite element software package. Deviations in the filament orientation of the fibrous layer is a dominant factor in the occurrence of local defects, which influences the mechanical response of the textile. Therefore, the introduction of variability in the orientation distribution is proposed in this paper. This approach enables to capture the entanglement of the filaments and models all interaction mechanisms. A stepwise generation of the numerical non-crimp fabric is proposed considering the main manufacturing steps to reproduce the local defects in the fibrous mat appropriately. Averaged periodic boundary conditions are developed ensuring an overall periodicity of the model while allowing reorientation at the scale of the filaments. Two various non-crimp fabrics are investigated and modelled. The distribution of the filaments in the simulation results correlate well with measurements of the filament orientation performed on the textiles. Moreover, a detailed comparison of the local defects shows a good agreement with measurements on the specimens. The presented approach can be used to generate geometries for subsequent virtual characterization.

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Modelling the deformability of biaxial non-crimp fabric composites

Cited by 7 publications

References 27 publications

Characterization and Analysis of In-Plane Shear Behavior of Glass Warp-Knitted Non-Crimp Fabrics Based on Picture Frame Method

Characterization and Analysis of In-Plane Shear Behavior of Glass Warp-Knitted Non-Crimp Fabrics Based on Picture Frame Method

Draping processes for composites manufacture

Virtual Description of Non-Crimp Fabrics at the Scale of Filaments Including Orientation Variability in the Fibrous Layers

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