孔隙坍塌行为对多孔材料冲击压缩特性的影响理论分析

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中图分类号：0346.3 国标学科代码：13015 文献标志码：A

Abstract：Porous materials exhibit pore collpse behavior during impact compression.Based on the shock wave structure observed inexperimentscariedoutbypredecessrs，atheoreticalanalysisoftherelationship betweentheshock wave formatioprocessandtheporecollapsebhaviorofporous materials isconducted.Firstly，consideringthecompresioncurve characteristicsof porous materials andtheovertaking ofshock waves，it is proposed thatthe shock wave structure of porous materials has three modes：low-pressure single wave mode，double shock wave mode，and high-pressure single wave mode. These different shock wave modes aremainlycaused bytheinfluence of elastic-plastic mechanical behavior inpore collapse on thecompression curve of porous materials.Furthermore，combined with theWu-Jing equationof state，thecalculation method of shock compresion characteristics compatible with diferent shock wave modes is developed.The relationship betweentheHugoniotcurveofporousmaterialanddensematerial isestablished，andthecalculationequationof impact specific volumecompatible withsingleshock wave modeisobtained，whichcandirectlycalculate thecriticalspecificvolume without approximate conditions.In addition，the equation of porecollpse establised by Carrollismodified bytaking the linear approximation ofthe variation ofporosity with pressure in theelastic stageand the elastic-plastic stage andcosidering therelationshipbetween the stressof the matrix material and the macroscopic stressin the porous material. Basedo the calculation modelof shock compression characteristicsconsidering porecollapse bhavior，the Hugoniotdataof the material arecalculated，andtheinfluenceofporecollpsebehaviorontheshockcompressioncharacteristicsofporousmaterialsis discussed.Theresultsshowthattheshockcompresioncharacteristicsofthe materialaresignificantlyaffectedbythepore collapse behavior at lower pressures，and the model in this paper can predict the shock wave parametersof porous materials more accurately.

Keywords：porousmaterial; Wu-Jing equations; shock wave structure;pore collapse

多孔材料内部孔隙体积占比可达 30% ，孔隙结构对其物理性能有着重要的影响[1]。（剩余14567字）