镀铜碳纤维增强铝基泡沫材料准静态压缩力学性能及吸能特性研究

采用熔体发泡法制备了镀铜碳纤维增强铝基泡沫材料,并对泡沫铝试样开展了准静态压缩力学性能及吸能特性研究。结果表明,铝/碳纤维复合泡沫材料的平台应力随相对密度的增加而增大,碳纤维含量越高,平台应力增大的速度越快,试样最大的屈服强度可达9.51MPa。密度对试样吸能效率和平台段吸能量同样有影响,对于相同碳纤维含量的试样,密度越大,能量效率峰值对应的应变值越小,单位体积泡沫铝在平台段的吸能量越高,而增加碳纤维含量,会使吸能量随密度增加而升高的趋势变得更加明显。

Study on quasi-static compression mechanical properties and energy absorption characteristics of Al/Cf Composite Foams

Copper-coated carbon fibers were used as novel stabilizer for aluminum foam, which was fabricated by a direct foaming method. Quasi-static compression mechanical properties and energy absorption characteristics were investigated. The results indicated that plateau stress of Al/C_f composite foams increased with an increasing in relative densities. The higher content of copper-coated carbon fibers, the faster plateau stress increased, and the maximum value of yield strength is up to 9.51MPa. The densities also have an effect on energy absorption efficiency and platform energy absorption. The densities also have an effect on energy absorption efficiency and platform energy absorption. For the Al/Cf composite foams containing the same amount of carbon fibers, the higher the density, the smaller value of the strain that corresponds to the energy absorption peak value. And the Al/Cf composite foams containing the same amount of carbon fibers show higher energy absorbing quantity for unit volume at platform stage. Increasing carbon fiber content has made the rising trend of energy absorption with increasing density more apparent.