Measurement and analysis of stress waves in concrete targets under ultra-high velocity impact conditions
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摘要: 为探究超高速撞击条件下混凝土靶内的应力波特性,建立了基于PVDF压电应力计的应力波测试系统并对PVDF压电应力计标定方法开展了研究,测量了克级柱形93W钨合金弹体超高速撞击条件下混凝土靶体内的应力波波形,并利用数值模拟方法对应力波的产生和传播机制进行分析,得到如下结论:(1)对PVDF压电应力计的动态特性参数进行标定,得到PVDF压电应力计的动态灵敏度系数为17.5±0.5 pC/N;(2)利用PVDF压电应力计得到了信噪比高的超高速撞击条件下混凝土靶内的应力波形;(3)数值模拟得到的应力波形与实验测得的波形特征吻合较好,应力波峰值的模拟结果与实验结果最大偏差不超过20%,能够为机理探索提供一个有用的工具。(4)利用数值模拟方法进一步认识了靶体内应力波的特征和产生衰减机制。
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关键词:
Abstract: To investigate the stress wave characteristics within concrete targets under ultra-high velocity impact conditions, a stress wave testing system based on PVDF piezoelectric stress gauges was established, and research on the calibration method for PVDF piezoelectric stress gauges was conducted. The stress waveforms within concrete targets impacted by kilogram-scale cylindrical 93W tungsten alloy projectiles at ultra-high velocity were measured, and the generation and propagation mechanisms of stress waves were analyzed using numerical simulation methods. The following conclusions were drawn: (1) The dynamic characteristic parameters of the PVDF piezoelectric stress gauge were calibrated, yielding a dynamic sensitivity coefficient of 17.5±0.5 pC/N for the PVDF piezoelectric stress gauge; (2) High signal-to-noise ratio stress waveforms within the concrete target under ultra-high velocity impact conditions were obtained using the PVDF piezoelectric stress gauge; (3) The stress waveforms obtained from numerical simulation were in good agreement with the experimentally measured waveforms, with the maximum deviation of the stress wave peak values between simulation and experimental results not exceeding 20%, providing a useful tool for mechanism exploration; (4) The characteristics of stress waves within the target and the mechanisms of generation and attenuation were further understood using numerical simulation methods.-
Key words:
- hypervelocity /
- impact /
- stress wave /
- PVDF /
- Tungsten alloy projectile /
- concrete /
- two-stage light gas gun
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