HTPB在高应变率斜波加载下的动力学响应

摘要

Based on the technique of magnetically driven ramp loading,the dynamic response of hydroxyl-terminated polybutadiene(HTPB) samples solidified by toluene diisocynate(TDI) were investigated under loading pressure up to 1.2 GPa.The velocity response curves of three HTPB samples with different thickness were obtained by Photonic Doppler Velocimeter(PDV).The sound velocity vs.particle velocity curve and stress vs.specific volume curve were obtained by Lagrange analysis method.Based on the relationships above and the loading history gained from experimental data,the experiments were validated by one dimensional hydrodynamic simulation.The simulation results are in good agreement with experimental results.Research shows that the Lagrange sound velocity vs.particle velocity behaves linear relationship.The loading strain rate ranges from 2×105 s-1 to 1 ×106 s-1 and the strain rate increases with the increasing of sample thickness,but no strain-rate effect is observed.All results agree with the shock loading results in reference.%利用磁驱动斜波压缩加载实验技术,开展了以甲苯二异氰酸酯(TDI)为固化剂的端羟基聚丁二烯(HTPB)样品在斜波加载下的动力学响应实验研究,实验峰值压力1.2 GPa.实验利用激光干涉测速技术获得了三种不同厚度的HTPB样品在斜波压缩加载下的速度响应曲线.对实验结果进行Lagrange数据分析处理,得到了HTPB样品的声速-粒子速度曲线和应力-比容关系.基于该应力-比容关系和实验获得的加载压力历史曲线,对斜波压缩实验进行了一维流体动力学模拟计算验证,模拟计算很好地再现了HTPB样品在斜波压缩加载下的动力学响应实验结果.研究结果显示,0～1.2 GPa压力范围内,HTPB样品的拉格朗日声速表现为线性行为,实验的应变率为2×105～ 1×106s-1,随着样品厚度增加,加载应变率随之增加,实验结果未见明显应变率效应,与文献冲击加载实验结论一致.