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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2×10~5~1×10~6s~(-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。
The dynamic response of HTPB samples with toluene diisocyanate (TDI) as curing agent under ramp-loading was studied by using magnetic-driven ramp compression loading experiment. The experimental peak pressure was 1.2 GPa . Experiments using laser interferometry tachometer technology to obtain three different thickness of the HTPB sample under ramp compression load response curve. The experimental results were analyzed by Lagrange data, and the relationship between the velocity of sound and particle velocity and the stress-specific volume of HTPB samples were obtained. Based on this stress-specific volume relationship and the experimentally obtained loading pressure history curve, a one-dimensional fluid dynamics simulations were carried out to validate the ramp compression experiments. The simulation calculations well reproduce the kinetics of the HTPB samples under ramp compression loading Response to experimental results. The results show that the sound velocity of the HTPB samples behaves linearly in the pressure range of 0-1.2 GPa, and the experimental strain rate is 2 × 10 ~ 5 ~ 1 × 10 ~ 6 s ~ (-1) As the thickness increases, the loading strain increases with the increase of the strain rate. No obvious strain rate effect is observed in the experiment, which is consistent with the experimental results of shock loading in literature.