Lateral Compression Properties of Special-Shaped 3D Tubular Woven Composites

In order to avoid the instability of composite materials laminated tube connection between layer and layer, with green basalt fiber as raw material, through the reasonable design, the special-shaped 3D (three-dimensional) tubular woven fabrics with two different thicknesses and shapes were fabricated on a semi-automatic sample loom with low cost. The special-shaped 3D tubular woven composites were fabricated by VARTM (vacuum assisted resin transfer molding) process. Load-displacement scatter plots and fitting curves and energy-displacement scatter plots and fitting curves were obtained by lateral compression tests. The results showed that the same shape,the load and energy absorption values increased with thickness and compression property was better. For the special-shaped 3D tubular woven composites with the same thickness, the load and energy absorption values of the circular tube was larger than the square tube. The correlation coefficients of load-displacement and energy-displacement polynomial fitting formulas calculated by the least square method in the Origin 8.5 software were all close to 1, indicated that the fitting effect was good. This method provided a direction for the research of special-shaped 3D tubular woven composites.

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