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Numerical and experimental investigation of the fracture behavior of shock loaded alumina

Science china(physics,Mechanics & Astronomy) 2010年第2期53卷 244-252页

作者： REN HuiLan1,SHU XueFeng2 & LI Ping3 1 State Key Laboratory of Explosion Science and Technology,Beijing institute of Technology,Beijing 100081,china 2 institute of Applied Mechanics and Biomedical Engineering,Taiyuan University of Technology,Taiyuan 030024,china 3 labroratory for shock wave and detonation physics research,institute of fluid physics,caep,mianyang 610059,china State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing China institute of Applied Mechanics and Biomedical Engineering Taiyuan University of Technology Taiyuan China labroratory for shock wave and detonation physics research Institute of Fluid Physics CAEP Mianyang China

Plate impact expeiments are conducted to investigate the dynamic behavior of alumina by using one stage light gas gun. A ve-locity interferometer system for reflectors (VISAR) is used to obtain Hugoniot elastic limit and the free surface velocity profile,which consists of an elastic wave followed immediately by a dispersive inelastic wave. The stress histories under different impact velocities are measured by in-material manganin gauges. Based on the experimental data a Hugoniot curve is fitted,which shows the compressive characteristics that alumina changes typically from elastic to "plastic" ,and under higher pressure it will be transferred to similar-fluid state. The turning point of the Hugoniot curve from a high pressure region to a low pressure region is about 11.4 GPa. The fracture process of alumina is simulated by way of finite element code. After the analysis of the fracture mechanism,the numerical results show an important role played by the nucleation and the growth of the cracks in the macro-scopic fracture of the alumina target. The numerical predictions of stress histories are compared with the experimental results,which indicates consistency between them.

关键词： plate impact experiment hugoniot curve fracture characteristics numerical simulation

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Large eddy simulation of a shocked gas cylinder instability induced turbulence

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Science china(physics,Mechanics & Astronomy) 2010年第9期53卷 262-268页

作者： LI Ping,BAI JingSong,WANG Tao & ZOU LiYong National Key Laboratory for shock wave and detonation physics research,institute of fluid physics,caep,mianyang 621900,china National Key Laboratory for shock wave and detonation physics research Institute of Fluid Physics CAEP Mianyang China

The Navier-Stokes equations for compressible fluid are solved with the operator splitting technique and LES (large eddy simulation) with the Smagorinsky model. A computational code MVFT (multi-viscosity-fluid and turbulence) is developed to study hydrodynamic instability and the induced turbulent mixing for multi compressible fluid. In order to validate the code MVFT,the LANL's shock tube experiment of shocked SF6 gas cylinder is simulated with the initial state of SF6 gas cylinder described by dissipative ITL (interface transition layer). It is shown that the width and height of gas cylinder calculated with MVFT are closer to the experimental results than RAGE,and that the velocities of upstream edge,downstream edge and vortex edge agree with the experimental results,and are appreciably smaller than the RAGE results. The code MVFT has been pre-liminarily validated.

关键词： Richtmyer-Meshkov instability large eddy simulation Navier-Stokes equations turbulence model

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Effects of viscosity on shock-induced damping of an initial sinusoidal disturbance

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Science china(physics,Mechanics & Astronomy) 2010年第5期53卷 802-806页

作者： MA XiaoJuan1,LIU FuSheng1 & JING FuQian2 1 College of Physical Science and Technology,Southwest Jiaotong University,Chengdu 610031,china 2 Laboratory for shock wave and detonation physics research,institute of fluid physics,Chinese Academy of Engineering physics,mianyang 621900,china College of Physical Science and Technology Southwest Jiaotong University Chengdu China Laboratory for shock wave and detonation physics research Institute of Fluid Physics Chinese Academy of Engineering Physics Mianyang China

A lack of reliable data treatment method has been for several decades the bottleneck of viscosity measurement by disturbance amplitude damping method of shock *** this work the finite difference method is firstly applied to obtain the numerical solutions for disturbance amplitude damping behavior of sinusoidal shock front in inviscid and viscous *** water shocked to 15 GPa is taken as an example,the main results are as follows:(1) For inviscid and lower viscous flows the numerical method gives results in good agreement with the analytic solutions under the condition of small disturbance(a0/λ=0.02);(2) For the flow of viscosity beyond 200 Pa s(η=κ) the analytic solution is found to overestimate obviously the effects of *** is attributed to the unreal pre-conditions of analytic solution by Miller and Ahrens;(3) The present numerical method provides an effective tool with more confidence to overcome the bottleneck of data treatment when the effects of higher viscosity in experiments of Sakharov and flyer impact are expected to be analyzed,because it can in principle simulate the development of shock waves in flows with larger disturbance amplitude,higher viscosity,and complicated initial flow.

关键词： viscosity coefficient two-dimensional Eulerian flow shock front sinusoidal disturbance

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A first-principles investigation into the hydrogen bond interaction in β-HMX

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Science china(physics,Mechanics & Astronomy) 2010年第6期53卷 1080-1085页

作者： CHEN Fang 1 ,ZHANG Hong 1,2,ZHAO Feng 3 ,MENG ChuanMin 3 & CHENG XinLu 1 1 institute of Atomic and Molecular physics,Sichuan University,Chengdu 610065,china 2 School of Physical Science and Technology,Sichuan University,Chengdu 610065,china 3 Laboratory for shock wave and detonation physics research,Southwest institute of fluid physics,china Academy of Engineering physics,mianyang 621900,china institute of Atomic and Molecular physics Sichuan University Chengdu China School of Physical Science and Technology Sichuan University Chengdu China Laboratory for shock wave and detonation physics research Southwest Institute of Fluid Physics China Academy of Engineering Physics Mianyang China

A theoretical study of structural and electronic properties of β-HMX crystal is performed using density-functional theory(DFT). The total density of states(TDOS) is presented. The atomic orbit projected density of state(PDOS) from the p-type orbit of C,N,O and the s-type orbit of H is discussed. The study by analyzing the PDOS shows that the structure of β-HMX crystal possesses C-H···O intra- and inter-molecular hydrogen-bonding. There exists a hydrogen bonding between H5 -1s and O12 -2p orbits,between H19 -1s and O28 -2p orbits of intra molecules,and between H19 -1s and O24 -2p orbits of inter molecules. The Mulliken population analysis is also made.

关键词： structural property hydrogen bond β-HMX population analysis

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shock　COMPRESSION　BEHAVIOR　OF　BROMOFORM

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原子与分子物理学报 1996年第4期 5-11页

作者： a. Lab for shock wave and detonation physics research, Southwest institute of fluid physics, P.O.Box 523-61, Chengdu, Sichuan 610003, P.R.china b. institute of Applied physics, Sichuan Union University, Chengdu, Sichuan 610065, P.R.china c. Current

ＳＨＯＣＫＣＯＭＰＲＥＳＳＩＯＮＢＥＨＡＶＩＯＲＯＦＢＲＯＭＯＦＯＲＭＰｅｎｇＳｈａｎｇｑｉａｎｇａ，ｂ，ｃＪｉｎｇＦｕｑｉａｎａ，ｂＨｕＪｉｎｂｉａｏａ，ｂＧｏｕＱｉｎｇｑｕａｎｂａ．ＬａｂｆｏｒＳｈｏｃｋＷａｖ... 详细信息

ＳＨＯＣＫＣＯＭＰＲＥＳＳＩＯＮＢＥＨＡＶＩＯＲＯＦＢＲＯＭＯＦＯＲＭＰｅｎｇＳｈａｎｇｑｉａｎｇａ，ｂ，ｃＪｉｎｇＦｕｑｉａｎａ，ｂＨｕＪｉｎｂｉａｏａ，ｂＧｏｕＱｉｎｇｑｕａｎｂａ．ＬａｂｆｏｒＳｈｏｃｋＷａｖｅａｎｄＤｅｔｏｎａｔｉｏｎＰｈｙ...

关键词： Bromoform shock compression EOS Two stage light gas gun

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《高压物理学报》创刊十周年

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高压物理学报 1997年第3期 2-3页

作者： Zhang Guanren (Laboratory for shock wave and detonation physics research, institute of fluid physics,caep,P.O.Box 523,Chengdu 610003,china) 《高压物理学报》编辑部

《高压物理学报》创刊十周年《高压物理学报》编辑部《高压物理学报》是我国高压物理领域内唯一专业性学术刊物，它是由中国物理学会高压物理专业委员会主办、中国工程物理研究院流体物理研究所承办的一份学术季刊。自１９８７年创刊以... 详细信息

《高压物理学报》创刊十周年《高压物理学报》编辑部《高压物理学报》是我国高压物理领域内唯一专业性学术刊物，它是由中国物理学会高压物理专业委员会主办、中国工程物理研究院流体物理研究所承办的一份学术季刊。自１９８７年创刊以来，至今已有１０年的历史了。在这期...

关键词： dynamical fracture material damage similarity.

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Large-eddy simulations of the Richtmyer-Meshkov instability of rectangular interfaces accelerated by shock waves

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Science china(physics,Mechanics & Astronomy) 2010年第12期53卷 905-914页

作者： WANG Tao,BAI JingSong,LI Ping & LIU Kun institute of fluid physics,china Academy of Engineering physics,mianyang 621900,china institute of fluid physics China Academy of Engineering Physics Mianyang China

A parallel algorithm and code MVFT(multi-viscous-fluid and turbulence) of large-eddy simulation(LES) is developed from our MVPPM(multi-viscous-fluid piecewise parabolic method),and performed to solve the multi compressible Navier-Stokes(N-S) *** effect of the unresolved subgrid-scale(SGS) motions on the large scales is represented by different SGS stress models in LES.A Richtmyer-Meshkov instability experiment of the evolution of a rectangular block of SF6,which occupies half of the height of the shock tube test section,following the interaction with a planar shock wave,is numerically and exhaustively simulated by this *** comparison between experimental and simulated images of the evolving SF6 block shows that they are *** numerical simulations reproduce the complex developing process of SF6 block,which grows *** geometric quantities that characterize the extents of SF6 block are also compared in detail between numerical simulations and experiment with good agreements between them,a quantitative demonstration of the developing law of SF6 *** is an evident discrepancy between the three numerical simulations for the maximum position of the right edge of block at the late stage,because the right interface grows complicated and the dissipation is different for different SGS *** SGS turbulent dissipation,molecular viscosity dissipation and SGS turbulent kinetic energy have been studied and *** have a similar distribution to the large eddy *** SGS turbulent dissipation is much greater than the molecular viscosity dissipation;the SGS turbulent dissipation of Vreman model is smaller than the Smagorinsky *** general,the simulated results of Vreman SGS model are better compared with the dynamic viscosity and Smagorinsky SGS *** vorticity and circulation deposition on the block interface have also been investigated.

关键词： large-eddy simulation Navier-Stokes equations subgrid-scale Richtmyer-Meshkov instability turbulent dissipation turbulent kinetic energy circulation deposition

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Vibrational relaxation dynamics in transient grating spectroscopy studied by rate equations based on time-dependent correlation function

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Chinese physics B 2012年第4期21卷 245-248页

作者：于国洋宋云飞何兴郑贤旭谭多旺陈军杨延强 Center for Condensed Matter Science and Technology Department of PhysicsHarbin Institute of TechnologyHarbin 150001China National Key Laboratory of shock wave and detonation physics Institute of Fluid PhysicsChina Academy of Engineering PhysicsMianyang 621900China

A modified model, a set of rate equations based on time-dependent correlation function, is used to study vibrational relaxation dynamics in transient grating spectroscopy. The dephasing, the population dynamics, and the vibrational coherence concerning two vibrational states are observed respectively in organic dye IR780 perchlorate molecules doped polyvinyl alcohol matrix. The result shows that in addition to the information concerning system-environment interaction and vibrational coherence, the vibrational energy transfer can be described by this modified model.

关键词： transient grating population dynamics vibrational energy transfer

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Method for Measuring Spectrum under shock with Multi-channel Time-resolution

Method for Measuring Spectrum under Shock with Multi-channel...

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18th International Conference on High Pressure Science and Technology

作者： Peng Qixian Hu Shaolou Tang Jingyouinstitute of fluid physics caepLab for shock wave physics and detonation physics research mianyang Sichuan 621900 P.R.china

＜正＞ When a source light is translated by several fiberswhich are different in length,the light coming outfrom fibers are not *** in shorter fibercomes out first,and light in longer fiber comes *** if the light are recorded at the end of the fiberswith same exposure time, we take the source light ofdifferent *** longer fiber records the earlieremission of source light,and the shorter fiber recordsthe later *** time difference between thefibers can be determined by the fibers’lengthdifference and velocity of light in the *** fibers are put in length order in vertical,eachpositioned apart from the *** we can taketime-resolution spectrum dispersed at differentheight.

关键词： time-resolved spectrum transient light.

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重力作用下颗粒介质应力链的离散元模拟

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物理学报 2009年第11期58卷 7750-7755页

作者：宜晨虹慕青松苗天德中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室绵阳621900 兰州大学土木工程与力学学院力学系兰州730000

用离散元的方法模拟了仅有重力作用的二维颗粒系统内部力的分布情况,并根据力的大小得到颗粒之间的应力链.模拟结果与颗粒介质研究中的两个著名模型q模型和α模型作了对比,并与光弹实验的结果作了比较.对比结果表明,模拟结果与实验相似... 详细信息

用离散元的方法模拟了仅有重力作用的二维颗粒系统内部力的分布情况,并根据力的大小得到颗粒之间的应力链.模拟结果与颗粒介质研究中的两个著名模型q模型和α模型作了对比,并与光弹实验的结果作了比较.对比结果表明,模拟结果与实验相似,而与两个概率模型有一定的差异.另外计算结果还表明,颗粒介质中力大小的概率分布极为不均匀,较大的力概率呈指数衰减,应力链的分布具有分形特征.

关键词：颗粒介质离散元应力链光弹实验

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