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

by Ali Habboush 1,2,3, Noor Sanbhal 4, Huiqi Shao 1,3, Jinhua Jiang 1,3,* and Nanliang Chen 1,3,*
1
Engineering Research Center of Technical Textiles, Ministry of Education, Donghua University, Shanghai 201620, China
2
Mechanical Textile Engineering, Aleppo University, Aleppo, Syria
3
College of Textiles, Donghua University, Shanghai 201620, China
4
Department of Textile Engineering, Mehran University of Engineering and Technology Jamshoro, Sindh 76062, Pakistan
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(9), 1550; https://doi.org/10.3390/ma11091550
Received: 20 June 2018 / Revised: 10 August 2018 / Accepted: 22 August 2018 / Published: 28 August 2018
(This article belongs to the Section Structure Analysis and Characterization)
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. View Full-Text
Keywords: glass fabrics; warp knitting; in-plane shear rigidity; picture frame test; tricot and chain stitches glass fabrics; warp knitting; in-plane shear rigidity; picture frame test; tricot and chain stitches
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Habboush, A.; Sanbhal, N.; Shao, H.; Jiang, J.; Chen, N. Characterization and Analysis of In-Plane Shear Behavior of Glass Warp-Knitted Non-Crimp Fabrics Based on Picture Frame Method. Materials 2018, 11, 1550.

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