高压物理学报

Several Influential Factors on Numerical Simulated Results for the X-Ray Thermal Shock Waves

ZHANG Ruo-Qi, TANG Wen-Hui, ZHAO Guo-Min

1998, 12(3): 161-167 . doi: 10.11858/gywlxb.1998.03.001

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Abstract:
Taking account of Compton scattering photons transport behavior or not, using what model to describe melting, vaporization and strain rate effect, how to determine free surface difference schemes, mesh size and time step, all of these factors will generate important effect on numerical simulated res...

Study on Synthesizing Flaky cBN Crystals and Its Conduction Property

ZHANG Tie-Chen, WANG Ming-Guang, GUO Wei-Li, LIU Jian-Ting, GAO Chun-Xiao, ZOU Guang-Tian

1998, 12(3): 168-173 . doi: 10.11858/gywlxb.1998.03.002

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Abstract:
We synthesized flaky cBN crystals that the grade of which is about 300~500 m by method of controlling temperature and pressure gradient in synthesized cell. The cBN crystal material with semiconductor characteristic is obtained by mixing method in material and in the high temperature-vacuum diffusio...

A One Dimensional Explicit Magnetic Hydro-Dynamic Model of Electro-Magnetic Implosion

LIAO Hai-Dong, HU Xi-Jing, YANG Li-Bing, FENG Shu-Ping

1998, 12(3): 174-180 . doi: 10.11858/gywlxb.1998.03.003

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Abstract:
In this paper, a one dimensional explicit model for solid density electromagnetic implosion is provided. Its solutions are in agreement with the results of the one dimensional implicit model.

Study on High Pressure-Induced Structural Transformation of KNb0.77Al0.23O2.77

LI Guang-Du, LI Li-Ping, WANG Min-Qiang, FENG Shou-Hua, CUI Qi-Liang, YAO Xi

1998, 12(3): 181-189 . doi: 10.11858/gywlxb.1998.03.004

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Abstract:
Various products including cubic KNb0.77Al0.23O2.77 and orthorhombic KNbO3 were hydrothermally synthesized. Structural evolution behaviors of the cubic were examined by means of X-ray diffraction (XRD), differential scanning calorimeter (DSC), high pressure Raman spectroscopy, Infrared (IR), and X-r...

A Set of Experimental Device of Preheating Materials under Shock Compression and Shock Response of Stainless Steel with High Temperature

GU Zhuo-Wei, JIN Xiao-Gang, ZHANG Qing-Fu, SUN Yue

1998, 12(3): 190-198 . doi: 10.11858/gywlxb.1998.03.005

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Abstract:
A set of material preheating system used in the light gas gun shock compressed experiment has been built up. The principle of structure and operation of the system are introduced. Using this system, the shock response, including spall strength, Hugoniot elastic limit and unloading sound velocity, of...

Dielectric Breakdown of Ferroelectric Ceramics PZT-95/5 under Shock Compression

WEN Dian-Ying, LIN Qi-Wen

1998, 12(3): 199-206 . doi: 10.11858/gywlxb.1998.03.006

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Abstract:
Shock loading technique is used to study dielectric breakdown of the PZT-95/5 ferroelectric ceramics caused by compress of shock waves on the direction vertical to the remnant polarization vector Pr in this paper. The character parameters of the dynamic dielectric breakdown with shock wave loading a...

Effect of the Crystal Size Distribution on the Compression Wave Velocity in Rocks at High Pressure: A Preliminary Result

ZHOU Wen-Ge, XIE Hong-Sen, ZHAO Zhi-Dan, LI Yu-Wen, GUO Jie, XU Zu-Ming, XU Ji-An

1998, 12(3): 207-211 . doi: 10.11858/gywlxb.1998.03.007

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Abstract:
The olivine crystal size distribution and compression wave velocity of trachybasalt from the Qinling-Dabie orogenic belt are measured. The samples are divided into two groups. Although the samples of each groups show similar chemical composition, mineral assemblage and mineral orientation, their oli...

Synthetic SiO2 Glass at 2.0~5.5 GPa

DING Dong-Ye, XIE Hong-Sen, SU Gen-Li, ZHANG Yue-Ming, GUO Jie, JIANG Da-Yong, XU Zu-Ming

1998, 12(3): 212-217 . doi: 10.11858/gywlxb.1998.03.008

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Abstract:
A series of SiO2 glasses are synthesized at 355～445 ℃ and 2.0～5.5 GPa, making use of silica (99.99% purity). The infrared spectra of these SiO2 glasses are similar to that of densified SiO2 glass. The relations between natural logarithm of pressure and index of SiO2 glass or densified SiO2 glass are...

Rigid Plastic Deformation of a Sphere Driven by an Explosive

TAN Duo-Wang, SUN Cheng-Wei

1998, 12(3): 218-222 . doi: 10.11858/gywlxb.1998.03.009

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Abstract:
A method of calculating the deformation of a sphere as a result of divergent or convergent detonation of an explosive is presented. This method bases on the conservation of mass and momentum, and assumes the sphere material is incompressible and rigid plastic. The accelerated movement of a sphere ca...

Electrical Properties and Phase Transitions in P(VDF-TrFE) (80/20 mol%) at High Pressure Using a DAC

BAO Zhong-Xing, Pinto N J, Schmidt V H, Tu C S

1998, 12(3): 223-227 . doi: 10.11858/gywlxb.1998.03.010

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Abstract:
Capacitance-pressure (C-p) and resistance-pressure (R-p) relationships for the ferroelectric eopolymer poly (vinylidenefluoride/trifluoroethylene), P(VDF-TrFE) (80/20 mol%) at room temperature up to 14 GPa were investigated in a diamond anvil cell (DAC) using capacitance and resistance measurements....

Free-Lagrangian Method for Simulating Shock Wave Propagation

YUE Zong-Wu, TANG Wen-Hui

1998, 12(3): 228-232 . doi: 10.11858/gywlxb.1998.03.011

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Abstract:
In this paper, a hydrodynamic code is written according to the free-Lagrangian method. Both examples of the shock tube and impact of flyer on target are simulated by this code. The results are in good accord with that obtained by traditional Lagrangian code.

Pressure-Induced Structure Phase Transitions of Sr2Bi4Ti5O18

HAN Jie, ZOU Guang-Tian, CUI Tian, LIU Bing-Bing, PAN Yao-Wu, GAO Chun-Xiao, YANG Hai-Bin

1998, 12(3): 233-235 . doi: 10.11858/gywlxb.1998.03.012

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Abstract:
The in situ high pressure Raman spectra and the pressure-induced structure phase transitions of layered ferroelectrics Sr2Bi4Ti5O18 have been studied in the range of 0~27 GPa with diamond anvil cell (DAC), using methanol-ethanol (4:1) mixture as transmission medium. We assigned the internal modes of...

A Simple Method for Manganin Piezoresistance Measurement

WANG Xiang, WANG Yuan-Jun, FU Qiu-Wei, WANG Wei

1998, 12(3): 236-240 . doi: 10.11858/gywlxb.1998.03.013

PDF (589)

Abstract:
A method for manganin piezoresistance measurement that uses a D. C. power supply is described. This technique is very simple and easy to match. Compared with the conventional technique which uses pulse power supply, it not only omits the trigger system, but also can reduce the electromagnetic distur...

1998 Vol. 12, No. 3

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