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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 03002.,China {2.,institute of fluid physics,caep,Mianyang 610059,China 1. State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China2. Institute of Applied Mechanics and Biomedical Engineering Taiyuan University of Technology Taiyuan 030024 China3. Labroratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics CAEP Mianyang 610059 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-{2. 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 {2. physics research,institute of fluid physics,caep,Mianyang 62.900,China 1. National Key Laboratory for shock wave and {2. physics research Institute of Fluid Physics CAEP Mianyang 621900 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 {2. physics research,institute of fluid physics,Chinese Academy of Engineering physics,Mianyang 62.900,China 1. College of Physical Science and Technology Southwest Jiaotong University Chengdu 610031 China2. Laboratory for Shock Wave and Detonation Physics Research Institute of Fluid Physics Chinese Academy of Engineering Physics Mianyang 621900 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 2.0 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 {2. wave and detonation physics research,Southwest institute of fluid physics,China Academy of Engineering physics,Mianyang 62.900,China 1. institute of Atomic and Molecular physics Sichuan University Chengdu 610065 China2. School of Physical Science and Technology Sichuan University Chengdu 610065 China3. Laboratory for Shock Wave and Detonation Physics Research Southwest Institute of Fluid Physics China Academy of Engineering Physics Mianyang 621900 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.-2. orbits,between H19 -1s and O2. -2. orbits of intra molecules,and between H19 -1s and O2. -2. 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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《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 {2. physics research, institute of fluid physics,caep,P.O.Box 52.,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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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 {2. physics research, Southwest institute of fluid physics, P.O.Box 52.-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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Transient Behavior of Negative Hydrogen Ion Extraction from Plasma

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Plasma Science and Technology 2013年第9期15卷 945-949页

作者：蓝朝晖institute of fluid physics China Academy of Engineering physics 彭宇飞杨振龙继东 institute of fluid physics China Academy of Engineering Physics

For plasma source, the extraction of negative ions is quite different from that of positive ions. To understand the effect of extraction field on plasma, the time-dependent behavior of negative hydrogen ion extraction from a negative ion source has been studied by particle-in-cell simulation in the collisionless limit. The simulations have shown that, due to the difference in dynamics between electrons and ions, the imbalance of the numbers of charged particles occurs in the source, results in the broadening of plasma sheath and the great increase of plasma potential. The resultant high sheath field and the ambipolar electric field in plasma make the negatively charged particles congregate inside the sheath and move toward the extraction outlet. The emission area of negative ions is much smaller than that of the extraction aperture, which is in sharp contrast to the case of positive ion extraction.

关键词： negative hydrogen ion particle-in-cell simulation ion source ion extraction

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Preparation of Mg-Ti System Alloy and FGM with Density Gradient by Spark Plasma Sintering Technique

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Journal of Wuhan University of Technology(Materials Science) 2004年第1期19卷 58-60页

作者：沈强 Laboratory for shock waves and {2. physics research

A new kind of functionally graded materials (FGM) with density gradient has come to show great potentials as flier-plates for creating quasi-isotropic compression *** order to meet the demand of lower density in the front face for such flier-plate,Mg with a low density of 1.74g/cm3 is selected to make a Mg-Ti ***-Ti alloys with various weight ratios were sintered by spark plasma sintering (SPS) technique at relative low temperatures,and the processing of densification is mainly *** is found that,up to 75wt%Ti,the Mg-Ti alloys can be fully densified at 560℃ due to the conglutination of Mg and the formation of a small amount of Mg-Ti solid ***,the Mg-Ti FGM with a density gradient from 1.74g/cm3 to 3.2.g/cm3 is successfully fabricated.

关键词： Mg-Ti alloy Mg-Ti FGM SPS technique

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γ-and α-Ce phase diagram: First-principle calculation

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Chinese physics B 2016年第3期25卷 129-133页

作者：张林李英华李雪梅张祖根叶想平蔡灵仓 National Key Laboratory of shock wave and {2. physics Institute of Fluid PhysicsCAEP

Controversies about the phase diagram for the isostructural y ＋＋ a phase transition of cerium have long been standing out for several decades. To seek insight into the problems, high-precision equations of state （EOS） for y- and a-cerium are constructed based on first-principle calculation. Versus previous works, the strong anharmonic effects of ion vibration and the variation of magnetism of y-cerium are stressed. The new EOS generally agrees well with experimental data regarding thermodynamics, phase diagrams, and phase transitions. However, new EOS predicts that another part of phase boundary in pressure-temperature space may exist except for the commonly known boundary. In addition, the well-known critical point seems to be a critical point for y-cerium to translate from a stable state to an unstable state.

关键词： ab initio calculations phase transition equation of states

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Dynamic strength behavior of a Zr-based bulk metallic glass under shock loading

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Chinese physics B 2015年第6期24卷 461-465页

作者：俞宇颖习锋戴诚达蔡灵仓谭叶李雪梅吴强谭华 Laboratory for shock wave and {2. physics research Institute of Fluid PhysicsChinese Academy of Engineering Physics

Dynamic strength behavior of Zr51Ti5NiloCu2.A19 bulk metallic glass （BMG） up to 66 GPa was investigated in a series of plate impact shock-release and shock-reload experiments. Particle velocity profiles measured at the sample/LiF window interface were used to estimate the shear stress, shear modulus, and yield stress in shocked BMG. Beyond confirm- ing the previously reported strain-softening of shear stress during the shock loading process for BMGs, it is also shown that the softened Zr-BMG still has a high shear modulus and can support large yield stress when released or reloaded from the shocked state, and both the shear modulus and the yield stress appear as strain-hardening behaviors. The work provides a much clearer picture of the strength behavior of BMGs under shock loading, which is useful to comprehensively understand the plastic deformation mechanisms of BMGs.

关键词： shock loading dynamic strength bulk metallic glass

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