Abstract
An experimental study of bending properties of composites reinforced with triaxial and quadaxial warp-knitted glass fabrics was carried out in the 0°, 45°, and 90° directions at −30°C, 0°C, 20°C, and 40°C, respectively. The relationships between the stress–strain curves, bending strength, bending modulus, and temperature were obtained. The failure mechanisms at different temperatures were also analyzed based on the fracture morphologies and scanning electron microscope (SEM) images. The results indicated that the bending properties decrease slightly with the increase in temperature from −30°C to 20°C and decrease dramatically from 20°C to 40°C. The ultimate bending strength of triaxial and quadaxial warp-knitted composites decreases approximately 31.34% and 34.29%, respectively. In particular, the relationships between bending strength and temperature were also obtained by nonlinear fitting with the experimental data, which could be used to predict the bending behavior at different temperatures.
Highlights
Multiaxial warp-knitted fabrics (MWF) are manufactured from multiple layers of straight fiber bundles with different orientations stitched together by a warp-knitting process
The quasi-static bending behavior of multiaxial warp-knitted composites (MWC) in the 0°, 45°, and 90° directions were conducted in different temperatures
The influences of temperature variations on the bending property and failure mechanism were analyzed with respect to bending strength, bending modulus, and fracture morphologies
Summary
Multiaxial warp-knitted fabrics (MWF) are manufactured from multiple layers of straight fiber bundles with different orientations stitched together by a warp-knitting process. The use of through-thickness stitching in fabric allows the handling stability and delamination toughness, good tensile, bending, shearing, and impact resistance properties. Woven fabrics, and the use of warp-knitted yarns allows handling stability and delamination toughness These advantages make the composites a kind of attractive engineering structure[2,3,4,5,6] materials. Jia et al.[13] conducted an experimental investigation of the temperature effect on the mechanics of carbon fiber– reinforced polymer (CFRP) composites under static and dynamic bending tests. As for the MWC, Li et al.[17,18] characterized the effect of temperatures on the bending properties and failure mechanism of 3D multiaxial warp-knitted carbon/epoxy composites at elevated temperatures.
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