【摘要】 利用聚偏二氟乙烯压电传感器研究了爆炸加载下冲击波在二氧化硅气凝胶中的传播特性,并对冲击波在二氧化硅气凝胶和泡沫铝中的传播特性进行了比较.结果表明:在二氧化硅气凝胶中冲击波的强度随传播距离的增加呈现指数衰减的趋势.冲击波在二氧化硅气凝胶中衰减比在泡沫铝中衰减明显.由于二氧化硅气凝胶内部特殊的纳米多孔网状结构,导致冲击波在二氧化硅气凝胶中的衰减效果较好.冲击波在二氧化硅气凝胶中的传播速度极低,因此冲击波在二氧化硅气凝胶中传播时卸载波的追赶卸载效应非常明显,这又进一步促进了冲击波的衰减.更多还原

【Abstract】 The propagation character of shock wave in SiO2 aerogel under explosive loading is studied using a polyvinylidene fluoride piezoelectric sensor.The propagation character of shock wave in aluminum foam is also determined for comparison.The results show that the peak stress of the shock wave follows the exponential attenuation relation with the propagation distance of the shock wave in SiO2 aerogel.The shock wave attenuates more obviously in SiO2 aerogel than in aluminum foam.The special nano-porous network structure of SiO2 aerogel results in better attenuation effect of shock wave in aerogel.The shock wave velocity in SiO2 aerogel is extremly low,thus the chase of the unloading wave leads to the further attenuation of shock wave.更多还原