梁-颗粒模型在混凝土侵彻问题中的应用
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摘要
用二维梁颗粒模型BPM2D(beam particle model in two dimensions)模拟了混凝土侵彻问题。在模型中用3 种类型梁单元形成混凝土数值试样。每种类型梁单元的力学性质均按韦伯分布随机赋值来模拟混凝土细观结构的非均匀性。利用此模型对在钢弹侵彻下混凝土圆板的破坏过程进行了数值模拟。通过将计算结果与实验数据及LS DYNA程序模拟结果比较,表明梁颗粒模型可有效地应用于计算和模拟材料从连续介质向非连续介质转变的动态破坏问题。
The BPM~(2D)(beam-particle model in two dimensions) was used to simulate the problem of concrete penetration. Three types of beam in the BPM~(2D) were used to create numerical models of concrete. The mechanical properties of each type of beam were randomly allocated according to Weibull distribution to reflect the initial heterogeneity of concrete at the mesoscale level. The failure process of a steel bullet perforating into a concrete panel was analyzed with this model. The comparison of the simulated results with the experimental data and the simulated results of the code LS-DYNA3D demonstrated that the BPM~(2D) was applicable to simulating the dynamic failure problems associated with the transition from continuum to discontinuous media.
The BPM~(2D)(beam-particle model in two dimensions) was used to simulate the problem of concrete penetration. Three types of beam in the BPM~(2D) were used to create numerical models of concrete. The mechanical properties of each type of beam were randomly allocated according to Weibull distribution to reflect the initial heterogeneity of concrete at the mesoscale level. The failure process of a steel bullet perforating into a concrete panel was analyzed with this model. The comparison of the simulated results with the experimental data and the simulated results of the code LS-DYNA3D demonstrated that the BPM~(2D) was applicable to simulating the dynamic failure problems associated with the transition from continuum to discontinuous media.
引文
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[2] 陈大年,AlHassaniS T S,尹志华,等.混凝土的冲击特性描述[J].爆炸与冲击,2001,21(2):89-97.CHEN Da nian,AlHassaniS T S,YIN Zhi hua, et al.Description of properties of concrete under impact[J].Ex plosion andShockWaves,2001,21(2):89-97.
[3] GeorginJ F,ReynouardJ M.Modeling of structures subjected to impact:Concrete behaviour under high strain rate[J].Cement&ConcreteComposites,2003,25:131-143.
[4] 刘凯欣,郑文刚,高凌天.脆性材料动态破坏过程的数值模拟[J].计算力学学报,2003,20(2):127-132.LIU Kai xin,ZHENG Wen gang,GAO Ling tian.Numerical simulation for the dynamic failure process in brittlematerials[J].ChineseJournal ofComputationalMechanics,2003,20(2):127-132.
[5] CambordeF,MariottiC,DonzéF V.Numerical study of rock and concrete behaviour by discrete element modeling[J].Computers andGeotechnics,2000,27:225-247.
[6] 邢纪波.梁颗粒模型导论[M].北京:地震出版社,1999:6-18.
[7] 唐春安,朱万成.混凝土损伤与断裂-数值试验[M].北京:科学出版社,2003:120-145.
[8] 张德海,邢纪波,朱浮声,等.混凝土破坏过程的数值模拟[J].东北大学学报,2004,5(2):175-178.ZHANG De hai,XING Ji bo,ZHU Fu sheng, et al.Study of failure process in concrete samples by using numeri cal simulation[J].Journal ofNortheasternUniversity,2004,25(2):175-178.
[9] HanchakS J,ForrestalM J,YoungE R, et al.Perforation of concrete slabs with48MPa and140MPa unconfinedcompressive strengths[J].InternationalJournal ofImpactEngineering,1992,12(1):1-7.
[10] 武海军,黄风雷,金乾坤,等.弹体贯穿钢筋混凝土数值模拟[J].爆炸与冲击,2003,23(6):545-550.WU Hai jun,HUANG Feng lei,JIN Qian kun, et al.Numerical simulation on perforation of reinforced concretetargets[J].Explosion andShockWaves,2003,23(6):545-550.
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