柱状装药爆炸条件下厚壁圆筒爆室内

流场及结构动力响应分析

姚哲芳; 任辉启; 沈兆武

doi:10.11883/1001-1455(2012)05-0449-08

柱状装药爆炸条件下厚壁圆筒爆室内流场及结构动力响应分析

中国科学技术大学近代力学系,安徽合肥230027;

西南科技大学土木工程与建筑学院,四川绵阳621010;

总参工程兵科研三所,河南洛阳471023

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通讯作者:
姚哲芳

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Internalblastflowfieldanddynamicresponsesofthick-walledcylinder subjectedtocylindricalchargeexplosion

Departmentof ModernMechanic,UniversityofScienceandTechnologyofChina,

Hefei230027,Anhui,China;

SchoolofCivilEngineeringandArchitecture,SouthwestUniversityofScienceandTechnology,

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Corresponding author: YAO Zhe-fang

摘要: 借助非线性动力有限元程序ANSYS/LS-DYNA,采用基于罚函数的流固耦合算法,对厚壁圆筒爆室在柱状装药爆炸作用下的动态响应过程进行了数值模拟研究。分析了厚壁圆筒爆室内柱状装药爆炸非定常流场的演化过程以及筒体的动力响应特征。给出了爆炸流场的压力云图、筒壁受到的爆炸压力峰值及冲量的分布规律、筒体的等效应力云图以及等效应力的分布规律等。流场压力及筒体应变的计算结果与实测结果吻合较好,并将动力响应的有限元计算结果与理论解进行了比较,证明轴对称平面应变假设下的理论解可以给出问题的保守估算。分析表明,该厚壁圆筒爆室在柱状装药爆炸作用下在弹性范围内工作,爆室的强度设计是安全的。

关键词:

Abstract: Withfluid-solidcouplingalgorithmbasedonthepenaltyfunctionofnon-lineardynamicfiniteelementprogram ANSYS/LS-DYNA,thedynamicresponseprocessofthethick-walledcylinder subjectedtointernalcylindricalchargeexplosionwasnumericallysimulated.Theevolutionoftheunsteadyblastflowfieldinthecylinderandthedynamicresponseofthecylinderwereanalyzed. Pressurecontourofblastflowfield, thedistributionofblastpressureandimpulseoninnerwallofthecylinder, von-Misesstresscontour,thedistributionofvon-Misesstressweregiven.Simulationresults ofblastpressureandhoopstrainwereingoodagreementwithexperimentalresults,andcalculation resultsofdynamicresponsewerecomparedwiththetheoreticalsolution.Itwasprovedthatthetheoreticalsolutionbasedonplane- strainassumptionmaygiveaconservativeestimateforthisproblem. Theresultsshowthatthethick-walledcylindersubjectedtointernalcylindricalchargeexplosionwas inelasticstate,andthedesignoftheblastchamberissafeincarryingcapacity.Theanalysesarehelpfultosimilardesignandsafeuseofblastchambers.

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