高压物理学报

Carbon Nanotube Properties under High Pressure

CHEN Liang-Chen, WANG Li-Jun, TANG Dong-Sheng, XIE Si-Shen, JIN Chang-Qing

2001, 15(1): 1-4 . doi: 10.11858/gywlxb.2001.01.001

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Abstract:
The structure and physical properties of carbon nanotubes under high pressure up to 50.7 GPa were investigated using in situ high pressure energy dispersive X-ray diffraction with synchrotron radiation. At atmospheric pressure, the structure of carbon nanotubes is similar to the hexagonal close-pack...

Strain Gradient Effects on the Strengthening Behaviors of Particle Reinforced Metal Matrix Composites

DAI Lan-Hong, LING Zhong, BAI Yi-Long

2001, 15(1): 5-11 . doi: 10.11858/gywlxb.2001.01.002

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Abstract:
Although much efforts have been made to understand the relationship between microstructures and deformation behaviors of particle-reinforced metal matrix composites (PRMMCs) during the past several decades, there are still some phenomena remained to be understood, one of which is size effects in PRM...

Enhancement of Both Ionic Conductivity and Permittivity of the High Polymer Film P(EO)n-CuBr2 under Hydrostatic Pressure (Ⅰ)－Discovery of Pressure Effects of Three Different Phases

SU Xiao, DAI Wei-Ping, SU Fang

2001, 15(1): 12-23 . doi: 10.11858/gywlxb.2001.01.003

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Abstract:
With the addition of different weight of CuBr2 (ratio n =[EO]/[Cu]=4, 8, 12, 16, 24) to polyethylene oxide (molecular weight 5106), a series of high polymer ionic conductors P(EO)n-CuBr2 were prepared. Both complex impedance spectra of samples in the hydrostatic pressure range from 0.1 to 350 MPa an...

A Constitutive Model for Materials under High-Temperature and Pressure

LI Mao-Sheng, CHEN Dong-Quan

2001, 15(1): 24-31 . doi: 10.11858/gywlxb.2001.01.004

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Abstract:
D.J.Steinberg, S.G.Cochran, and M.W.Guinan (SCG) presented a constitutive model for metals applicable at high strain rate in 1980. A new expression for the temperature related term in SCG model was suggested in this work. The expression gives that their moduli vanish at melting temperature, i.e., G(...

Effects of Graphitization on the Synthesis of Ultrafine Diamond by Explosive Detonation

CHEN Peng-Wan, YUN Shou-Rong, HUANG Feng-Lei, DING Yan-Sheng, CHEN Quan

2001, 15(1): 32-38 . doi: 10.11858/gywlxb.2001.01.005

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Abstract:
Graphitization plays an important role in the synthesis of Ultrafine Diamond (UFD) during explosive detonation. Carbon phase diagram was studied and a diamond-graphite dynamic equilibrium line is introduced to study the effects of graphitization. The effects of graphitization under different charge ...

Investigation of Shock Pressure Evolution of Initiation in IHE's JB9014 at Ambient and -54 ℃

CHI Jia-Chun, LIU Yu-Sheng, GONG Yan-Qing, LI Qiang

2001, 15(1): 39-47 . doi: 10.11858/gywlxb.2001.01.006

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Abstract:
The pressure evolution of shock initiation for IHE's JB9014 at ambient and -54 ℃ was investigated experimentally using embedded manganin gauges. The pressure evolution observed in JB9014 at -54 ℃ shows homogeneous initiation mechanism, by comparison, these observed in JB9014 at ambient temperature s...

Grain Size Refinement and Homogenization of Multi-component Powders by Shock Treatment

YANG Shi-Yuan, JIN Xiao-Gang, DONG Yu-Bin

2001, 15(1): 48-53 . doi: 10.11858/gywlxb.2001.01.007

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Abstract:
The grain size refinement and homogenization of Al-C, Al-Si and Si-C powders after shock loading were studied. Experimental results show that shock wave propagation in powders resulted in significantly grain size reduction and homogenization of micron powders. The extent of grain size reduction of o...

Oblique Shock Wave Propagation in Water

TANG Wen-Hui

2001, 15(1): 54-59 . doi: 10.11858/gywlxb.2001.01.008

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Abstract:
The relation among downstream Mach number, density ratio, pressure increase, shock angle and upstream Mach number are discussed based on a simple equation of state for water. A dimensionless shock polar equation is presented. The critical conditions for the turning of attached oblique shock wave to ...

Pressure Effect on Lattice Distortions of La0.3Bi0.2Ca0.5MnO3

WANG Xin, CUI Qi-Liang, PAN Yue-Wu, ZOU Guang-Tian, LIU Jing

2001, 15(1): 60-63 . doi: 10.11858/gywlxb.2001.01.009

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Abstract:
In-situ high pressure behaviors of Jahn-Teller distortions in La0.3Bi0.2Ca0.5MnO3 were studied by energy dispersive X-ray diffraction. External pressure modified effectively local structural parameters such as the MnO bond distance and MnOMn bond angle, and brings about the competition between the d...

Pressure Effect on Rheological Properties of Food Gum Solutions

LI Bian-Sheng, ZENG Qing-Xiao, RUI Han-Ming, LIU Tong-Xun, CHEN Zhong, RUAN Zheng

2001, 15(1): 64-69 . doi: 10.11858/gywlxb.2001.01.010

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Abstract:
The rheological properties of food gum solutions (carrageenan, agar, high methoxyl pectin, sodium alginate, xanthan and guar gums) after high pressure treat were investigated. After the treatment, the viscosity of the solutions changes very differently. The viscosity of carrageenan and agar solution...

Flyer Velocity Measurement Using Double-Sensitivity VISAR

CHEN Guang-Hua, LI Ze-Ren, LIU Yuan-Kun, MA Ru-Chao, LIU Jun

2001, 15(1): 70-74 . doi: 10.11858/gywlxb.2001.01.011

PDF (478)

Abstract:
A double-sensitivity VISAR was used to measure flyer velocity. Through comparing two velocity histories and combining with physical consideration, it is possible to guess how many fringes were lost due to bandwidth limitation of VISAR.

Li3N Function in BN Synthesis

XU Xiao-Wei, LIU Zhi-Fu, LIN Qian-Shao, LI Yu-Ping

2001, 15(1): 75-79 . doi: 10.11858/gywlxb.2001.01.012

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Abstract:
Li3N functions in the reactions between B4C and nitrogen containing compounds were investigated under high temperature. Experimental results showed that no hBN formed from the reaction between B4C and Si3N4, and only small amount of hBN formed from the reaction between B4C and NH4Cl. After Li3N was ...

2001 Vol. 15, No. 1

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