【摘要】 利用三维编织技术制备了内凹六边形结构预制体，对三种不同内凹角的内凹六边形蜂窝状复合材料进行了压缩测试，分析了能量吸收性能和损伤变形演变。研究表明，三维编织内凹六边形蜂窝状复合材料在压缩过程中都产生层层单胞折叠压缩的变形演变趋势，载荷-位移曲线拥有较长的压缩平台期，表现出优异的能量吸收性能。内凹角度对内凹六边形复合材料吸能性能有明显影响，内凹角度50-50的试样的比吸能和平台载荷大于内凹角度60-60的试样；结构的不对称性可以提高内凹六边形复合材料的吸能性能，内凹角度50-60的不对称内凹六边形复合材料的比吸能和平台载荷是三种结构中最大的。更多还原

【Abstract】 The preform of concave hexagonal structure was prepared by three-dimensional braiding technology. The energy absorption properties and damage deformation of three kinds of hexagonal honeycomb composites with different concave angles were analyzed by compression tests. The results showed that the three-dimensional braided concave hexagonal honeycomb composite had a gradual deformation trend of layer by layer unit cell folding and compression during the compression process, and the load-displacement curve had a longer compression plateau, showing excellent energy absorption properties. The concave angle had obvious influence on the energy absorption properties of the concave hexagon composite. The specific energy absorption and platform load of the concave angle 50-50 were greater than those of the concave angle 60-60. The asymmetric structure could improve the energy absorption properties of the concave hexagon composite. The specific energy absorption and platform load of the asymmetric concave hexagon composite with concave angle of 50-60 were the largest among the three structures.更多还原