Analysis of spherical stress wave propagating in PMMA
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摘要: 基于球形发散波实验技术及圆环型电磁粒子速度测试技术,采用0.125gTNT当量的微型炸药作 为爆炸源,对填实爆炸下有机玻璃中球形波的传播规律进行了实验研究,并基于粒子速度波形进行了分析。 结果表明:粒子速度峰值及粒子位移峰值符合指数衰减规律,粒子速度、位移峰值的衰减指数分别为1.34和 1.28;负向粒子速度峰值随比距离的增加有先增大后减小的趋势;基于强间断假设得到的低压(小于1GPa) 下径向压力峰值-粒子速度峰值关系与一维应变下得到的-v Hugoniot曲线吻合较好;采用变模量模型假设, 结合粒子速度数据反演的有机玻璃弹性模量E=(6.400.64)GPa、体积模量K =(7.120.71)GPa、剪切 模量G=(2.370.24)GPa。Abstract: Basedonthetechniqueofthesphericaldivergentstresswaveexperimentsandthecirque electromagnetictestingmethodoftheparticlevelocity,thepropagationofsphericalstresswaveand theparticlevelocitiesinPMMAundertampedexplosionwereexperimentallyinvestigatedbychoosing aminiaturesphericalexplosiveof0.125gTNTequivalentasthesphericalexplosionsource.The resultsrevealthatthepeakvaluesoftheparticlevelocitiesanddisplacementsfollowexponentialattenuationlawsandthecorrespondingattenu tionindexesare1.34and1.28,respectively.Asthescaled distanceincreases,thenegativepeakvaluesoftheparticlevelocitiestrendtofirstincreaseandthen decrease.Astheradialstressislowerthan1GPa,therelationsoftheradialstresspeakwiththeparticlevelocitypeakunderthestrongdiscontinuityassumptionareconsistentwiththe- v Hugoniot curvesfromone-dimensionalstrainexperiments.Andinvertedfromthevariablemodulusmodelassumptionandtheparticlevelocitycurves, theelastic,bulkandshearmoduliofPMMAare(6.40 0.64),(7.120.71)and(2.370.24)GPa,respectively.
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Key words:
- solidmechanics /
- sphericalstresswave /
- velocitygauge /
- PMMA /
- mini-chemicalexplosion
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