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ID:36543472
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页数:9页
时间:2019-05-11
《弹丸对混凝土薄板的冲击破坏效应》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第24卷第4期岩石力学与工程学报Vol.24No.42005年2月ChineseJournalofRockMechanicsandEngineeringFeb.,2005弹丸对混凝土薄板的冲击破坏效应董军,邓国强,杨科之,王安宝,杨秀敏(参保建筑设计院,北京100850)摘要:介绍高速弹丸冲击混凝土薄板后所产生的贯穿破坏效应,通过模型试验、数值模拟和量纲理论分析,取得了三者吻合较好的结果,并导出了计算弹丸穿透混凝土薄板后残余速度的经验公式。通过弹丸撞击有限厚度钢筋混凝土靶板的模型试验,获得了有关靶板冲击破坏的宏观图象及弹丸贯穿靶板后的残余速度。介绍了非线性三维动力有限元程
2、序和混凝土材料的脆性损伤模型,对弹丸冲击效应试验中的靶板破坏过程进行了数值模拟,通过数值模拟计算,形象地再现了弹丸高速冲击作用下,钢筋混凝土靶板发生贯穿破坏的物理过程,数值模拟结果与试验中靶板的实际破坏图象十分吻合。通过量纲分析,得出了描述钢筋混凝土板冲击破坏效果各参数之间的无量纲关系,利用现场试验数据进行回归,导出了贯穿条件下的弹丸余速计算公式。关键词:数值模拟;高速弹丸;混凝土板;冲击贯穿;模型试验;量纲分析中图分类号:O241,TU455文献标识码:A文章编号:1000–6915(2005)04–0713–08DAMAGEEFFECTOFTHINCONCRETESL
3、ABSSUBJECTEDTOPROJECTILEIMPACTDONGJun,DENGGuo-qiang,YANGKe-zhi,WANGAn-bao,YANGXiu-min(CanbaoBuildingDesignInstituteofBeijing,Beijing100850,China)Abstract:Perforationdamageeffectsofthinconcreteslabsproducedbyimpactofprojectileathighvelocityarestudied.Modeltest,numericalsimulation,anddimens
4、iontheoryareemployedtoanalyzethedamageeffectsandtheresultsofthethreemethodsarewellconsistent.Empiricalformulaisderivedtocalculateresidualvelocityofprojectileperforatingthroughthethinconcreteslabs.Themacroscopicdamageimageofreinforcedconcreteslabsunderimpacteffectareobtainedthroughmodeltes
5、t,andtheresidualvelocityoftheprojectilearegainedfromthetests.Three-dimensionalnonlineardynamicfiniteelementprogramandthebrittlenessdamagemodelofconcreteareintroduced.Thenumericalsimulationofdamageprocessofexperimentaltargetslabsisaccomplished.Thephysicalprocessessuchaspenetrationperforati
6、onandimpactperforationofreinforcedconcreteslabssubjectedtoprojectilewithhighspeedaredisplayedvisually.Thesimulationresultsfitwellwiththeexperimentaldamageimage.Throughdimensionanalysis,thedimensionlessrelationshipbetweenallparametersthatinfluencetheimpactdamageeffectofreinforcedconcretesl
7、absareachieved.Regressiveanalysisoftestdataarecarriedouttoobtainthecalculationformulaeforprojectileresidualvelocitiesundertheconditionofpenetrationperforationorimpactperforation.Keywords:numericalsimulation;high-velocityprojectile;concreteslab;impactperforation;mode
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