Abstract:The needled/stitched dual-scale interlocking structure is a new fabric structure. However, the effect of stitching on the interlaminar bonding behavior of needled composite has not been elucidated. In this work, the needled/tufted dual-scale interlocking composite was prepared, and experimental and numerical simulation of Mode I interlaminar property was carried out. The influence of stitching on the interfacial bonding behavior of needled composite was revealed. Results showed that the implantation of tufted … Show more
“…19,20 and tufting equipment. 18 for maunfactuing the needled/tufted preform were independently developed by Tiangong University, as shown in Figure 1(b) and 1(c). The type of needling needles was 15 × 18 × 36× 3 C333, and the stitching needle was DB × 1100/16.Figure 1.Fabrication process and machines of needled/tufted interlocking fabric.…”
Section: Methodsmentioning
confidence: 99%
“…Xue L et al 17 strengthen needled fabrics by use of “n” path stitching, carried out the preparation and characterization of needled/stitched coupled fabrics and their composites, and revealed the mechanism of compression damage evolution. Recently, Zheng H et al 18 put forward of needled/tufted coupled fabric, and carried out research on the peeling property of needled/tufted composites. Needled/tufted coupled fabric is a new style fabric structure, and the influence of tufting on interlaminar shear mechanical behavior of needled composites has not been clarified, so this paper proposed to study the Mode II interlaminar shear behavior of needed/tufted interlocking composites.…”
The needled/tufted interlocking fabric is a new fabric structure. At present, the mode II interlaminar shear behavior of needled/tufted interlocking composite has not been clarified. In this work, the needled/tufted interlocking fabrics and reinforced composites were fabricated, and the interlaminar shear behavior of mode II was studied experimentally and numerically, the mechanism of tufting effect on interlaminar shear properties of needled composites was revealed. The study found that the interlaminar shear properties of needled/tufted interlocking composites were greatly improved by tufted fiber bundles. The maximum failure load of the needled/tufted interlocking specimen increased 108.93%, and the interlaminar shear stress of the needled/tufted interlocking specimen improved by 89.39%. The interlaminar shear strength increased linearly with the increase of tufted fiber bundle implantation volume. The implantation pattern of tufted fibers had effected on interlaminar shear property. Under the same implantation volume, the thinner tufted fiber bundles and more implantation points were more beneficial to improve the interlaminar shear performance. The typical shear failure modes included matrix cracking, fibers pullout, and brittle fracture of tufted fiber bundles and needled fiber bundles. Moreover, a numerical simulation model of interlaminar shear behavior based on three cohesive zones (TCZMs) was proposed. The predicted displacement-load curves were highly in accord with the experiments. The error range was controlled within 1.08% - 3.76%. The simulation model could predict the mode II shear behavior of needled and tufted interlocking composites effectively, which was helpful to the early manufacturing process design of needled and tufted interlocking fabrics.
“…19,20 and tufting equipment. 18 for maunfactuing the needled/tufted preform were independently developed by Tiangong University, as shown in Figure 1(b) and 1(c). The type of needling needles was 15 × 18 × 36× 3 C333, and the stitching needle was DB × 1100/16.Figure 1.Fabrication process and machines of needled/tufted interlocking fabric.…”
Section: Methodsmentioning
confidence: 99%
“…Xue L et al 17 strengthen needled fabrics by use of “n” path stitching, carried out the preparation and characterization of needled/stitched coupled fabrics and their composites, and revealed the mechanism of compression damage evolution. Recently, Zheng H et al 18 put forward of needled/tufted coupled fabric, and carried out research on the peeling property of needled/tufted composites. Needled/tufted coupled fabric is a new style fabric structure, and the influence of tufting on interlaminar shear mechanical behavior of needled composites has not been clarified, so this paper proposed to study the Mode II interlaminar shear behavior of needed/tufted interlocking composites.…”
The needled/tufted interlocking fabric is a new fabric structure. At present, the mode II interlaminar shear behavior of needled/tufted interlocking composite has not been clarified. In this work, the needled/tufted interlocking fabrics and reinforced composites were fabricated, and the interlaminar shear behavior of mode II was studied experimentally and numerically, the mechanism of tufting effect on interlaminar shear properties of needled composites was revealed. The study found that the interlaminar shear properties of needled/tufted interlocking composites were greatly improved by tufted fiber bundles. The maximum failure load of the needled/tufted interlocking specimen increased 108.93%, and the interlaminar shear stress of the needled/tufted interlocking specimen improved by 89.39%. The interlaminar shear strength increased linearly with the increase of tufted fiber bundle implantation volume. The implantation pattern of tufted fibers had effected on interlaminar shear property. Under the same implantation volume, the thinner tufted fiber bundles and more implantation points were more beneficial to improve the interlaminar shear performance. The typical shear failure modes included matrix cracking, fibers pullout, and brittle fracture of tufted fiber bundles and needled fiber bundles. Moreover, a numerical simulation model of interlaminar shear behavior based on three cohesive zones (TCZMs) was proposed. The predicted displacement-load curves were highly in accord with the experiments. The error range was controlled within 1.08% - 3.76%. The simulation model could predict the mode II shear behavior of needled and tufted interlocking composites effectively, which was helpful to the early manufacturing process design of needled and tufted interlocking fabrics.
“…This might be owing to the effective contact between the polymer chain and the bio-filler via hydrogen bonding. [26,27] Moreover, the uniform arrangement of bio-filler in the polymer is slightly changed into an agglomerated structure at higher loading (at 20 wt%).…”
Polymer composites reinforced with synthetic materials are losing acceptability due to significant environmental concerns and high costs. Natural fillers are becoming increasingly popular due to their non‐toxicity, lightweight, low energy consumption, and environmental friendliness. In the present work, poly (vinyl acetate) (PVAc) and asparagus racemosus (AR) bio‐composites have been prepared by an in‐situ emulsion polymerization method. The composite films were subsequently examined by Fourier transform infrared spectroscopy (FT‐IR), X‐ray diffraction, atomic force microscopy (AFM), field emission scanning electron microscopy (FE‐SEM), optical microscope, differential scanning calorimeter (DSC), and thermogravimetric analysis. The formation of AR in PVAc composite was confirmed by the characteristic AR band at 3300 cm−1 in FT‐IR spectra. X‐ray diffraction studies showed a shift in the amorphous peak of PVAc/AR composites compared to pure PVAc. The AFM, FE‐SEM, and optical microscopic results revealed the uniform distribution of AR in the polymer matrix. DSC and TGA measurements showed that the glass transition temperature and thermal stability of PVAc increased with the inclusion of bio‐filler. The tensile strength, hardness, dielectric constant and AC conductivity of PVAc were observed to increases with boehmite inclusion, whereas elongation at break is reduced. As a result, environmentally friendly PVAc/AR composites with good mechanical, thermal and electrical properties could be a viable green substitute for energy storage, flexible electronic, and other electrochemical devices.
“…The basis of 3D textile production relies on the placement of Z yarn technology in the thickness of fabric. While the binding warp yarns connect the weft layers in the 3D woven fabrics, 4,5 the Z yarn is inserted into the fabric layers by the needles in the 3D tufted 6,7 or stitched 8,9 fabrics. Moreover, it is possible to obtain 3D textiles by the using of knitting, 10,11 braiding 12,13 or non- woven 14,15 production technologies.…”
Orienting or placing the yarns at the third direction of three dimensional (3D) textiles may improve or degrade the in- plane mechanical properties of 3D composites. In the previous study, the bending and out- of- plane mechanical properties of 3D composites were comprehensively investigated. As the controversial results can be clarified in the literature, the study was extended to investigate the in and off- axes mechanical properties of 3D composites. The tensile and in- plane shear properties of 3D carbon woven, 3D carbon multi- axis warp knitted, and 3D carbon stitched fabrics were comparatively examined from dry structure to the composite. In addition, a carbon traditional laminated composite was produced and tested to make a comparison. According to the load bearing capacity of 3D textiles from dry structure to the composite, the 3D woven fabric shown the worst performance.
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