| Citation: |
HE Hongmei, GAO Xingzhong, XIANG He, et al. Compression and bending properties of 3D braided tubular composites[J]. Acta Materiae Compositae Sinica.
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With the development of composite materials, three-dimensional braided tubular composite materials are widely used in load-bearing structural components. Fiber properties have a significant effect on the mechanical properties of tubular composites, but the deformation and failure evolution of different fiber composite are not clear. This paper investigates the mechanical properties of different tubular composite materials braided composites and their deformation and failure evolution by preparing two kinds of fiber-reinforced tubular composites with high modulus and high strength and high toughness fibers.
In this paper, the preparation of tubular preform adopts four-step three-dimensional braiding technology, and the parameters such as braiding angle and knurl height are ensured to be consistent through the controlled variable method. The test takes the silicone round rod as the mandrel, the carbon fiber and ultra-high molecular weight polyethylene fiber are circularly braided and molded through the four-step method, and the yarns are clustered on the mandrel to form the carbon fiber tubular preform and the ultra-high molecular weight polyethylene fiber tubular preform. The two kinds of fiber fittings composites are prepared by combining the vacuum-assisted resin transfer molding process. In order to investigate their failure behavior, this paper refers to the GB/T1446-2005 standard and GB/T1449-2005 “Test
for Flexural Performance of Fiber Reinforced Plastics” to conduct axial quasi-static compression test and three-point bending test on the specimens respectively. A high-speed photographic instrument is used to record the compression damage process of the specimens. Through Digital image correlation (DIC) method, the specimen surface is scattered and the deformation information of the region is obtained through correlation calculation to demonstrate the deformation and failure process of tubular composite materials.
(1) The deformation of carbon fiber tubular composite changed significantly in a shorter time than that of UHMWPE fiber tubular composite, and the two showed different damage characteristics. The distribution of deformation of carbon fiber tubular composite changes significantly at 17.4 s, The deformation is mainly concentrated in the region of shear slippage occurs. Deformation of UHMWPE fiber tubular composite at the beginning stage is relatively uniform until 58.2 s when the distribution of deformation significantly changes, which gradually concentrated in the middle of the “bulge” region. Carbon fiber tubular composite presents obvious shear damage characteristics, UHMWPE material presents toughness pressure collapse deformation process. After reaching the maximum load, if the strain variable increased 0.5%, the stress value of carbon fiber composite material declines rapidly, the percentage of decline is 14%. While the UHMWPE material is “fluctuating” decline, the percentage of decline is 0.72%. (2) The compression strength and energy absorption of carbon fiber tubular composites are higher than that of UHMWPE materials, with compression strength of 110.64 MPa, 56% higher than that of UHMWPE materials, and energy absorption value follows the same pattern, which is about 20.9% higher than that of UHMWPE materials. (3) The bending strength of carbon fiber tubular composite is higher than that of UHMWPE composite. The bending strength of carbon fiber material is 38.63 MPa, it is 50% higher than the bending strength of UHMWPE material. The bending energy absorption of carbon fiber tubular composites is 463.1 J, 68% higher than that of UHMWPE.Conclusions: The deformation of high toughness UHMWPE fiber tubular composite material in compression is more uniform than that of high strength and high modulus carbon fiber tubular composite material, and the deformation of specimen is more inclined to the overall strain rather than the local concentrated strain. In addition, the compression and bending strengths of the high-strength and high-modulus fittings are 56% and 50% higher than those of the high- toughness composites, respectively. The compression and bending energy absorption is 20.9% and 68% higher than that of the high- toughness composites, respectively. The deformation evolution of the tubular composites indicates that the enhancement of strength and modulus can increase the energy absorption of composites.
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