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摘要: 通过实验研究了混凝土薄板的侵彻响应,讨论了混凝土侵彻问题研究的理论模型和数值模型应注 意的几个问题。实验研究中,采用应变片、加速度计和高速摄影测试和记录了侵彻过程中混凝土薄板的力学 响应过程。实验结果表明,边界不仅是应力波反射的主要影响因素,而且还是结构整体冲击响应和破坏的主 要因素。通过综合分析实验数据,建立了混凝土薄板侵彻分析的三阶段力学模型:侵彻初期必须计及应力波 的影响,随着侵彻的深入,应力波的作用逐渐减弱直至消失,碎块的惯性运动逐渐加强,后期主要是残块在惯 性作用下的运动。Abstract: Penetrationexperimentswereconductedbylaunchinghemispherical-nosesolidsteelprojectilesintothinconcretetargets. Basedontheaboveexperiments,someproblemscorrelatedwiththe theoreticalmodelandnumericalmodelwerediscussed.Inthepenetrationexperiments,thestrain,the accelerationandthedeforminghistoryofthetargetsweremeasuredbystraingauges,accelerometers andahigh-peedcamera,respectively.Experimentalresultsshowthatthetargetboundariesaremain factorsaffectingthestresswavereflectionandthepenetrationresponsesinthetargets.Andthepenetrationcanbedividedintothefollowingthreestages: thestresswavepropagationmustbeconsidered intheinitialstage;thestresswavepropagationandthefragmentflyingarethemainresponsesinthe secondstage;andthestresswavepropagationdisappearsandthefragmentsflyingbecomesthemain responseinthethirdstage.
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Key words:
- mechanicsofexplosion /
- mechanicalmodel /
- penetration /
- concrete
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