超高速撞擊條件下混凝土靶體內(nèi)應(yīng)力波的測量和分析

打開文本圖片集

中圖分類號：0385 國標(biāo)學(xué)科代碼：13035 文獻(xiàn)標(biāo)志碼：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

超高速撞擊條件下應(yīng)力波的產(chǎn)生傳播規(guī)律，是深入認(rèn)識超高速撞擊過程和揭示撞擊機理的關(guān)鍵，也是工程應(yīng)用的重要依據(jù)。（剩余14943字）