高压物理学报

Experimental Study on Reactions of Graphite and Siderite with Supercritical Water

WENG Ke-Nan, XIAO Wan-Sheng, ZHANG Hui-Zhi, WANG Ben-Shan

1996, 10(4): 241-244 . doi: 10.11858/gywlxb.1996.04.001

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Abstract:
In order to investigate the formation mechanism of abiogenetic hydrocarbon in the deep earth, experiments on reactions of graphite and siderite with supercritical water have been conducted using the apparatus of diamond anvil cell (DAC) under temperature about 800～1 500 ℃ and pressure approximately above 1 GPa. The gas phase products have been analyzed by means of gas chromatography, which show that both reactions can generate a large number of methane, accompanied with small amount of CO2 and CO and some other hydrocarbons. The above results suggest that under the high temperature and pressure conditions in the earth's interior, reactions of carbon-bearing materials with supercritical water is likely a new and important mechanism in hydrocarbon formation.

Shock-Induced Phase Transitions of Single Crystal InSb along (111) Axis

LI Da-Hong, TANG Zhi-Ping, LI Xin-Zeng, ZHOU Guang-Quan, WANG Wen-Qiang

1996, 10(4): 245-251 . doi: 10.11858/gywlxb.1996.04.002

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Abstract:
Shock-induced phase transition along the (111)-axis of InSb single crystal were studied by using light-gas-gun techniques, along with the influences of shear stress on the phase transition. Shock pressure ranges from 1.75 to 3.8 GPa. It is found that the incipient pressure of phase transition for InSb single crystal shifted from 2.3 GPa under static compression to 1.727 GPa under shock loading. The maximum relative strain of volume (V/V0) equals to 15.31%, corresponding to the maximum shear stress of 0.681 GPa. Shear stress level is about 83% and the average hydrostatic pressure of phase transition decreased from 2.3 GPa under static to 0.823 GPa under shock. Therefore shear stress will have great effects on induction of the phase transition in InSb single crystal.

Study on Detonation Driving of Insensitive High Explosive

LIU Wen-Han, LI Liang-Zhong, YU Chuan, YANG Shu-Ying, FENG Min-Xian

1996, 10(4): 252-261 . doi: 10.11858/gywlxb.1996.04.003

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Abstract:
Two typical detonation driving models for IHE have been experimentally studied. One is divergent detonation driving with point initiation, the other, the slipping detonation driving. The HE detonation driving experiments were conducted at the same condition in order to compare the IHE and the HE driving. Numerical simulation for experimental models by means of two-dimensional code and fitted formulas were also conducted. Finally, the difference between the two explosive driving methods under our experimental conditions has been given and the calculated errors have been estimated.

A Numerical Simulation to the Deformation of an Internally Pressured Cylinder Tank under Intensive Laser Irradiation

ZHAO Jian-Heng, ZHANG Guan-Ren, LIU Xu-Fa

1996, 10(4): 262-268 . doi: 10.11858/gywlxb.1996.04.004

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Abstract:
When intensive laser beam irradiated on a cylinder tank wall, bulge and rupture will take place at the area laser loaded. In this paper, the finite element method is used to simulate the deformation. The stress and strain field calculations predict that the center of the laser beam irradiated region is the most dangerous where rupture will take place. This result is in good agreement with the experiment.

An Investigation on CW Laser Induced Two-Dimensional Nonlinear Temperature Field of Metals

WANG Wei-Ping, LIU Xu-Fa, LIU Chang-Ling

1996, 10(4): 269-274 . doi: 10.11858/gywlxb.1996.04.005

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Abstract:
The thermal effects of the continuous wave (CW) laser (intensity 1 kW/cm2, spot diameter 2.8 cm) irradiation on 30CrMnSiA steel and LD10-CS aluminum alloy were investigated with a 2-dimensional finite element model. The simulation gives the target temperature field at different time, the different temperature response of the two metals and the target surface laser reflectivity influence on temperature rise.

Effects of High Temperature on Fullerences

MA Yan-Zhang, ZOU Guang-Tian, HAN Jie, LI Xiang-Sheng, PAN Yue-Wu, LUO Wei

1996, 10(4): 275-279 . doi: 10.11858/gywlxb.1996.04.006

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Abstract:
The high temperature behavior of fullerenes was studied in this paper. It is found that the molecular structures of fullerenes will be destroyed at temperatures higher than 870 K, and transform into an amorphous state of carbon. The effect of the space structure of fullerenes on its thermal characteristics was discussed. It is believed that the polarization of fullerenes molecular due to molecular collisions is the main cause of its structure conversion.

The Formation of a New Approximant of Decagonal Quasi-Crystal in Al6FeYb Alloy under High Static Pressure

XU Da-Peng, PANG Yan-Xin, SU Wen-Hui

1996, 10(4): 280-283 . doi: 10.11858/gywlxb.1996.04.007

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Abstract:
In the investigations, samples of Al6FeYb alloy were quenched with a cooling rate of 102 K/s from melting state (1 400 ℃) under high static pressure (4.8 GPa). A new crystalline approximant was observed and its structure was a B-type orthorhombic crystalline phase with the lattice parameters of a=0.716 nm, c=2.195 nm. The structure and formation of the crystalline approximant were discussed by the current theory.

Equation of State of Detonation Products and the Possible Phase Transition for CHBr3

LIU Hai-Feng, CHEN Dong-Quan, ZHANG Shi-Ze

1996, 10(4): 284-290 . doi: 10.11858/gywlxb.1996.04.008

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Abstract:
The equilibrium compositions of the gas-solid mixture are calculated by minimizing the Gibbs free energy and chemical equilibrium. BKW and VLW equations are proposed for the EOS of detonation products and the detonation properties of explosive composed of C-H-N-O have been calculated. The results are agreed with experiment data excellent. Moreover, the equilibrium calculations are conducted on the dissociation of shock compressed liquid bromoform and our numerical results agree with reported shock-wave data. The analysis based on our numerical results suggests that at 55～60 GPa there occurs a continuous shock dissociation rather than a thermodynamic phase transition.

The Effect of the Grain Size of a Liner on the Performance of Shaped Charge Jets

WANG Tie-Fu, WANG Lei, RUAN Wen-Jun, ZHAO Tong-Hu

1996, 10(4): 291-298 . doi: 10.11858/gywlxb.1996.04.009

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Abstract:
For a given shaped charge, the effects of the grain size of a liner on the performance of shaped charge jets have been investigated with aid of fire tests and flash X-ray radiographs. It was shown from experimental results that the performance of copper liner shaped charge jets are strongly dependent on the grain size of an initial liner. The smaller the grain size, the greater the cumulative length and break-up time will be and the better is the performance of penetration. The mechanism was discussed simply.

Measurement of Shock-Hugoniot Curve of Low-Density Silastic

ZENG Jian-Rong, LIU Yong, DU Bao-Guo, XU Liang

1996, 10(4): 299-303 . doi: 10.11858/gywlxb.1996.04.010

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Abstract:
The shock-Hugoniots of two low-density silastic samples were measured by the impedance matching method in the pressure range from 2.5 to 15 GPa. The p-up and us-up curves were obtained. C0, and were calculated by using least square fitting. The experimental results are in reasonable agreement with the theoretical predictions.

An Experimental System for Emission Spectra Measurements under Shock Wave Compression

WANG Yong-Guo, HU Dong, XU Gang, LI Xiao-Chang, SHI Shang-Chun, JING Fu-Qian, XIAO Bang-Neng

1996, 10(4): 304-307 . doi: 10.11858/gywlxb.1996.04.011

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Abstract:
An experimental system for measuring emission spectra has successfully been established by using a two-stage light-gas gun and the OMA-Ⅲ system, in which pulse-gated synchronous trigger technique was used. The timing trigger is the most important aspect of this kind experimental technique.

1996 Vol. 10, No. 4

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