聚氨酯泡沫铝复合材料动态力学实验

通过在开孔泡沫铝中填充聚氨酯得到了聚氨酯泡沫铝, 利用Hopkinson杆对泡沫铝与泡沫聚氨酯组成的三维连续网络增强复合材料进行了在不同相对密度、 应变率和聚氨酯含量下的动态压缩实验。结果表明, 在相同应变率和相对密度下, 与泡沫纯铝相比, 聚氨酯泡沫铝屈服强度和压缩应变量显著增加, 而且应力-应变曲线出现明显的抖动。 随着应变的不断增大, 应力也逐渐增加, 在达到某一相同的应变时, 聚氨酯泡沫铝的应力值较高, 吸能量也较多。另外, 当应变率增加时, 聚氨酯泡沫铝表现出很明显的应变率效应。 

Experimental study on dynamic mechanical performance of polyurethane- aluminum foams composites

The polyurethane-aluminum foam was fabricated by filling the open-cell aluminum foam with polyurethane. Making use of the Hopkinson pressure bar, the dynamic compression experiments have been carried out to reinforced composites of three-dimensional continuous network composed of aluminum foam and polyurethane under different relative density, strain rate and polyurethane content. The experiment results indicate that the yield strength and the compression strain of polyurethane-aluminum foam are significantly improved, compared with the aluminum foam under the identical strain rate and relative density, and its stress-strain curve displays some obvious fluctuations. With the increase of the strain, the stress also increases and when the strain reaches a certain value, the stress corresponding to the polyurethane-aluminum foam is higher and its energy absorption is more than that of the aluminum foam. Furthermore, when the strain rate increases, polyurethane-aluminum foam presents an obvious effect of strain rate.