冲击压缩下PMMA的响应和光学特性

Dynamic Response and Optical Properties of PMMA under Shock Compression

利用二级轻气炮测量了聚甲基丙烯酸甲酯(Polymethylmethacrylate,PMMA)在一维平面冲击压缩条件下的响应和光学特性。采用全光纤激光干涉测试技术(DPS)测量样品在冲击加载下的界面粒子速度和冲击波速度,获得了PMMA材料在冲击压力6~50GPa区间内的高精度冲击Hugoniot数据,冲击波速度不确定度小于1%。同时获得了冲击压缩条件下PMMA样品材料的高压折射率与密度的变化关系以及界面粒子速度修正系数,并实时观测到了PMMA材料中的表观冲击波速度剖面,讨论了冲击波速度剖面与真实冲击波速度的关系。

Symmetric plate impact experiments were performed using a two-stage light gas gun to investigate the dynamic response and optical properties of polymethylmethacrylate（PMMA）under shock loading.The particle velocity of the flyer/sample interface,the shock velocity,and the refractive index of the sample were measured using a Doppler pin system（DPS）.The measurements produced accurate Hugoniot data for PMMA,with the uncertainty of the shock velocity below 1%.The velocity correction at1 550 nm of the wavelength under shock pressures ranging from 6to 50 GPa was also obtained.The relationship between the refractive index and the density under shock compression was deduced from the measurements.Moreover,the shock velocity was distinctly captured by DPS and its relationship with the actual shock velocity was examined.