超高速撞击条件下混凝土靶体内应力波的测量和分析

打开文本图片集

中图分类号：0385 国标学科代码：13035 文献标志码：A

Abstract：Toinvestigatethestress wavecharacteristicswithinconcrete targetsunderhypervelocityimpact，astress wave testing system based on polyvinylidene difluoride （PVDF）piezoelectric stress gauges was established.A calibration method for PVDF piezoelectric stressgauges was proposed and conducted.The stress waveforms within concrete targets impacted by kilogram-scalecylindrical93Wtungstenaloyprojectilesathypervelocitywere measured，and the generationand propagation mechanisms of stress waves were analyzed using numerical simulation methods.The folowing conclusions were drawn： （1）the dynamiccharacteristic parametersof thePVDF piezoelectric stress gauge were calibrated toyieldadynamic sensitivity coefficient of pC/N for the PVDF piezoelectric stress gauge； （2） high signal-to-noise ratio stress waveforms within theconcrete target under hypervelocity impact conditions were obtained using the PVDF piezoelectric stressgauge； （3）the stress Waveforms obtained from numerical simulation were in good agreement withtheexperimentall measured waveforms wherethe maximum deviation of the stress wave peak values between simulation and experimental results is less than 20 % providing a usefultolfor mechanismexploration； （4）the characteristics of stress waves withintheconcrete target and the mechanisms of generation and attenuation were further explored using numerical simulation methods.

Keywords： hypervelocity impact； tress wave； PVDF； tungstenally projectile； concrete target； two-stage light gas gun

超高速撞击条件下应力波的产生传播规律，是深入认识超高速撞击过程和揭示撞击机理的关键，也是工程应用的重要依据。（剩余14943字）