Measurement of the Mie-Grüneisen equation of state for polyimide
Measurement of the Mie-Grüneisen equation of state for polyimide
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DOI：
10.1007/s11434-012-5602-4
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发表时间：
2013-02
影响因子：
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通讯作者：
Hua Chen;Wenhui Tang;Xianwen Ran;Mingjian Zhang;ZhiHong Xu
中科院分区：
文献类型：
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作者：
Hua Chen;Wenhui Tang;Xianwen Ran;Mingjian Zhang;ZhiHong Xu
状态方程（EOS）是描述物质在给定的一组物理条件下的状态的热力学方程，并且Mie-Grüneisen EOS是广泛用于固体材料的EOS。聚酰亚胺是一种典型的由酰亚胺单体组成的复杂高分子聚合物，广泛应用于航空航天零部件和惯性聚变能壳体的制造。当航天器与流星体（或轨道碎片）发生碰撞或在高功率激光辐照下，飞行器外壳内的聚酰亚胺材料处于高压状态。为了研究航天器和IFE壳体的安全性，需要确定聚酰亚胺的状态方程。本研究利用二级轻气炮实验确定了聚酰亚胺材料基于冲击波的Mie-Grüneisen状态方程的三个关键参数，即聚酰亚胺材料的体声速为2.62± 0.22km/s，线性Hugoniot斜率系数为1.25±0.063，初始状态下的Grüneisen参数为1.53±0.135。最后得到了聚酰亚胺的Mie-Grüneisen状态方程，并利用实验数据对两种不同理论模型计算的Grüneisen参数值进行了比较，验证了参数值的可靠性。
An equation of state (EOS) is a thermodynamic equation describing the state of matter under a given set of physical conditions, and the Mie-Grüneisen EOS is a widely used EOS for solid materials. Polyimide is a typical complex high-molecular polymer of imide monomers which is widely used in the manufacture of parts for aerospace technology and for fabricating the inertial fusion energy shells (IFE). When a spacecraft collides with a meteoroids (or orbital debris) or the IFE shells are radiated by high power laser, the polyimide used in the equipment is in high pressure state. In order to study the safety of the spacecraft and IFE shells, the EOS of polyimide should be determined. In our research, the three key parameters of the Mie-Grüneisen EOS based on the shock adiabat for polyimide have been determined with two-stage light-gas gun experiments, i.e. the bulk speed of sound of polyimide is determined as 2.62±0.22 km/s, the linear Hugoniot slope coefficient is determined as 1.25±0.063, and the Grüneisen parameter at initial state is determined as 1.53±0.135. The Mie-Grüneisen EOS for polyimide is finally obtained, and the parameter values are proved reliable via the comparison of Grüneisen parameter value calculated from two different theoretical models using the experimental data.