聚乙烯冲击压缩特性实验研究

Experimental study on shock compression properties of polyethylene

利用神光Ⅱ装置第九路输出的倍频激光,采用直接驱动方式研究了聚乙烯(CH2)材料的冲击压缩特性.实验表明聚乙烯冲击波阵面自发辐射较强,冲击波在聚乙烯台阶中的传播比较稳定.采用阻抗匹配方法,以铝作标准材料,测量了聚乙烯的冲击绝热线,聚乙烯冲击压强达0.54TPa,冲击波速度测量相对扩展不确定度～2%(K=2),实验数据的一致性较好,与已有低压实验数据及状态方程解析模型比较符合.

Shock compression properties of polyethylene （CH2） were studied at SG-Ⅱ laser facility. The experimental results show that the self-emission is high,which emits from the shock-front in polyethylene. And the shock-front propagates through the polyethylene step almost with constant velocity. The Hugoniot equation of state （EOS） of polyethylene was measured by using the impedance-matching method with aluminum as standard material. Pressures are high up to 0. 54 TPa in polyethylene,and the relative expanded uncertainties of the measured shockwave velocity are about 2% （K = 2）. Moreover,the consistency of our data is good,and our data are also consistent with existing experimental data and EOS model.