高压物理学报

Phonon Spectrum and Elastic Constants of Copper at High Pressure

MA Gui-Cun, LIU Wei-Feng

2008, 22(4): 337-342 . doi: 10.11858/gywlxb.2008.04.001

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Abstract:
Based on the embbeded atom method (EAM) of Foiles, Baskes and Daw, We have established the EAM potential of Copper by using Vinet-Rose universal equation of state. Phonon spectrum and elastic constant of copper at high pressure are calculated by first principle perturbation theory and embedded atom ...

Numerical Simulation of Projectile Shape Effects on Craters in Hypervelocity Impact on Thick Alloy Aluminum Target

ZHANG Wei, GUAN Gong-Shun, JIA Bin, PANG Bao-Jun

2008, 22(4): 343-349 . doi: 10.11858/gywlxb.2008.04.002

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Abstract:
The numerical simulation of projectile shape effects on craters in hypervelocity impact on thick alloy aluminum target at normal angles has been carried out using the AUTODYN hydro-codes in this paper. The results of 2D and 3D simulation are given. The effect of projectile aspect ratios with differe...

Study on Chemical Reaction Models in Gaseous Detonation Numerical Simulation

WANG Gang, ZHANG De-Liang, LIU Kai-Xin

2008, 22(4): 350-356 . doi: 10.11858/gywlxb.2008.04.003

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Abstract:
Three common chemical reaction models in gaseous detonation numerical simulation have been studied in this work based on an improved space-time conservation element and solution element method. Planar and cellular detonations have been simulated and the numerical results have been compared and discu...

Eulerian Grid Subdivision Algorithm Based on Unsplit Method

NING Jian-Guo, LIU Chun, MA Tian-Bao

2008, 22(4): 357-363 . doi: 10.11858/gywlxb.2008.04.004

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Abstract:
When dealing with the problems of multi-material interaction explosion and impact numerical simulation, hydrodynamics numerical methods of Euler is one of the most effective ways. When using unsplit method to deal with pure cells in Euler coordinate, mixed cells are subdivided based on Youngs' inter...

The Experiment Design for Explosive Welding of Multilayer Amorphous Foils

FU Yan-Shu, SUN Yu-Xin, WANG Xiao-Ping, ZHANG Xiao-Li

2008, 22(4): 364-369 . doi: 10.11858/gywlxb.2008.04.005

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Abstract:
Because of the high strength and temperature sensitivity of the metal glass, its lower limit is higher and upper limit is lower than crystal metal when bulk metal glass was prepared by amorphous foils explosive welding. In this paper, the surface of foils was coated by copper to decrease surface har...

Construction and Analysis of SSH-cDNA Library Induced by High Pressure in Rice Seeds during Germination

LIU Xun-Cheng, ZHANG Mei, DUAN Jun

2008, 22(4): 370-376 . doi: 10.11858/gywlxb.2008.04.006

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Abstract:
In order to study the effect of expression pattern of high hydrostatic pressure on high plant, a SSH-cDNA library was constructed with rice germinating seeds in this paper. Suppression subtractive hybridization (SSH) in combination with mirror orientation selection (MOS) was performed using the mRNA...

Numerical Analysis of the Characteristics of Debris Clouds Produced by Hypervelocity Impacts Using SPH Method

XU Jin-Zhong, TANG Wen- Hui, XU Zhi-Hong

2008, 22(4): 377-383 . doi: 10.11858/gywlxb.2008.04.007

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Abstract:
The characteristics of debris clouds produced by hypervelocity impacts are simulated and analyzed by smoothed particle hydrodynamics (SPH). The variational laws of the diameter of holes, the debris clouds width, the cumulative percentage of fragments, the dimensionless momentum MD/M0 and the residua...

The measurement of Velocity-per-Fringe Constants of VISAR

MA Yun, ZHANG Lin, PENG Qi-Xian, WANG Xiang, LI Jian-Feng, CAI Ling-Cang, LI Jia-Bo, WANG Xiao-Song, WENG Ji-Dong, CHEN Hong

2008, 22(4): 384-388 . doi: 10.11858/gywlxb.2008.04.008

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Abstract:
Four experimental approaches had been developed to measure the velocity-per-fringe constants of VISAR. In particular, owing to the high accuratity and the wide applicable range, the integrated VISAR and DISAR approach should be a versatile method to measure arbitrary velocity-per-fringe constants of...

Optimization of High Pressure Sintering Process for PDC by Orthogonal Experiments

LIN Feng, JIANG Wei, FENG Ji-Fu, LI Li-Wei, Lü Hai-Bo

2008, 22(4): 389-396 . doi: 10.11858/gywlxb.2008.04.009

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Abstract:
The wear ratio, resistance, integrality and hardness of polycrystalline diamond compacts (PDC) are investigated. The high pressure sintering processes are optimized using orthogonal experiments. According to our experimental results, the optimized parameters for the high pressure sintering of PDC ar...

Property Comparison of Porous Graphite Nanopowders Prepared by Detonation Splitting Technique with Different Acid Content

SUN Gui-Lei, LI Xiao-Jie, YAN Hong-Hao, WANG Xiao-Hong, JIANG De-An

2008, 22(4): 397-401 . doi: 10.11858/gywlxb.2008.04.010

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Abstract:
N2 adsorption/desorption isotherms and pore diameter distribution of the porous graphite nanopowders, prepared by detonation splitting technique with different acid content in raw materials, were analyzed using Brunauer-Emmet-Teller (BET) equation and Barrett-Joyner-Halenda (BJH) method. The results...

Study on the Intensity of the Cylindrical Vessel by the Inner Underwater Explosion Shock Wave

FAN Zi-Jian, SHEN Zhao-Wu, LIAO Xue-Yan, LIU Yuan-Dong

2008, 22(4): 402-408 . doi: 10.11858/gywlxb.2008.04.011

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Abstract:
The paper have analyzed and evaluated the elastic shell strain of the cylindrical vessel by the inner underwater explosion shock wave, according to the thin shell and underwater explosion theory. The numerical results of the relationship between the elastic shell strain and three main factors, i.e. ...

Simplification of M-G Model and Experimental Result Analysis of Preheated Mo

WANG Qing-Song, LAN Qiang, WU Jing

2008, 22(4): 409-413 . doi: 10.11858/gywlxb.2008.04.012

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Abstract:
The expressions of Hugoniot parameters of preheated metal were obtained by simplification of M-G EQS model, which made it more easily to determine Hugoniot parameters of metal at various initial temperature using M-G model. The EQS of Mo at 1 400 ℃ had been studied by Miller and Duffy, which was not...

Temperature Measurement for the Interface of the Dense Bulk Iron/Sapphire Window under Shock Compression

GUO Jin-Liang, LIU Fu-Sheng, HAO Gao-Yu, ZHANG Ming-Jian, ZHANG Dai-Yu, XUE Xue-Dong

2008, 22(4): 414-418 . doi: 10.11858/gywlxb.2008.04.013

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Abstract:
The iron sample is symmetrically impacted by a high speed flyer of the same material, which is launched by use of two-stage light-gas gun. The temperature of the interface between iron and sapphire is determined by measuring the spectra illuminaton. In experiment, a new technique is applied to prepa...

Multi-Shock Hugoniot Equation of State of Liquid Carbon Monoxide Measured By an Optical Analysis Technique

ZHENG Xue-Ping, LIU Fu-Sheng, ZHANG Ming-Jian, CHEN Xian-Meng, SUN Yue

2008, 22(4): 419-424 . doi: 10.11858/gywlxb.2008.04.014

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Abstract:
The cryogenic target technique and an optical analysis technique are combined to measure multi-shock Hugoniot equations of state of liquid carbon monoxide. The first, second, and third shock pressures are respectively 19 GPa, 60 GPa, and 71 GPa. The maximum compression ratio of volume reaches three ...

Analyzing Material Strength in Shock-Induced Melting Region with Renormalization Group Theory

RAN Xian-Wen, TANG Wen-Hui, TAN Hua, XU Zhi-Hong

2008, 22(4): 425-428 . doi: 10.11858/gywlxb.2008.04.015

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Abstract:
The material strength in shock-induced melting region was analyzed with renormalization group theory, it indicates that the material strength begin to decrease as soon as the melting mass fraction reach 0.300 798, corresponding to the point at which the longitudinal sound velocity initially turn to ...

The Research on Dissolvability and Phase Transition of Gypsum at High Pressure and Ambient Temperature

WANG Shi-Xia, ZHENG Hai-Fei

2008, 22(4): 429-433 . doi: 10.11858/gywlxb.2008.04.016

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Abstract:
The Raman spectra of gypsum during the pressure of 200~1 100 MPa is studied at ambient temperature, and the dissolvability and phase transition of gypsum are observed. It shows that gypsum is stable at the pressure less than 407 MPa; and then gypsum begins to dissolve with the increasing pressure. G...

Microstructural Characteristics in Al-Based Alloys Solidified under High Pressure

SUN Shu-Hua, LI Jie, ZHAO Hai-Li, XU Rui, LIU Ri-Ping

2008, 22(4): 434-438 . doi: 10.11858/gywlxb.2008.04.017

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Abstract:
The microstructures of hypoeutectic and hyper-eutectic Al-Cu and Al-Si alloys solidified at high pressure (5 GPa) have been investigated. The results showed that high pressure has an evident influence on the morphologies and the dimensions of the solidified microstructures. This influence is directl...

Effects of Dynamic Instantaneous High Pressure Treatment on the enzymolysis rate of Dietary Fiber

WAN Jie, LIU Cheng-Mei, LAN Hai-Jun, TU Zong-Cai, LIU Wei

2008, 22(4): 439-444 . doi: 10.11858/gywlxb.2008.04.018

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Abstract:
The enzymolysis rates of cellulase on dietary fiber under dynamic Instantaneous High Pressure (IHP) were studied in the paper. Utilizing the Microfluidizer machinery as the carrier of Instantaneous High Pressure treatment to deal with dietary fiber from bean dregs, we got dietary fiber of different ...

Initial Porosity Effect on the Shaped Charge Jet Behavior

LI Ru-Jiang, SHEN Zhao-Wu, WANG Feng-Ying

2008, 22(4): 445-448 . doi: 10.11858/gywlxb.2008.04.019

PDF (972)

Abstract:
Shock heating can cause temperature rise before the porous liner collapse process because of its porous nature, which is possible to increase the jet temperature and enhance the jet ductility. The temperature rise calculation method was presented, and the porous effect on the jet behavior was studie...

2008 Vol. 22, No. 4

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