高压物理学报

Building of a Constitutive Model for Concrete under Dynamic Impact

WANG Zheng, NI Yu-Shan, CAO Ju-Zhen, ZHANG Wen

2006, 20(4): 337-344 . doi: 10.11858/gywlxb.2006.04.001

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Abstract:
By analyzing both of dynamic behavior and existing constitutive models of concrete, a new constitutive model has been built to simulate dynamic response of concrete. The main factors such as pressure, the third invariant of stress tensor, strain hardening and softening, stain rate and tensile damage...

Effective Viscosity Coefficients, Initial Mobile Dislocation Densities and Drag Stresses for Five Materials

ZHANG Wan-Jia, LIU Cang-Li

2006, 20(4): 345-352 . doi: 10.11858/gywlxb.2006.04.002

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Abstract:
Based on the experimental results of the elastic precursor attenuation along with propagation distance, with rate-dependent constitutive relation including dislocation parameters, and according to the thermally activated dislocation motion model proposed by Gilman, the lower bounds of the initial mo...

Numerical Simulation of Hopkinson Spalling of Rock Using Manifold Method

HUANG Tao, CHEN PengWan, ZHANG GuoXin, YANG Jun

2006, 20(4): 353-358 . doi: 10.11858/gywlxb.2006.04.003

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Abstract:
The second-order manifold method (MM) is used to simulate the dynamic Hopkinson spalling process of rock under shock loading through introducing a criterion of crack initiation and crack growth. The attenuation of stress waves and the spalling process caused by a reflected tensile stress wave are re...

Experimental and Numerical Investigation of Shock Wave Focusing and Reflection

DONG Gang, YE Jing-Fang, FAN Bao-Chun

2006, 20(4): 359-364 . doi: 10.11858/gywlxb.2006.04.004

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Abstract:
The incident shock wave focusing and reflection on the two parabolic reflectors were studied by means of high speed photograph technique and numerical simulation method. The experimental shadow photographs and computational density contours were obtained, and the good agreements between the experime...

Propagation of Irreversible Macroscopic Phase Boundaries along a Finite Rod under Dynamic Loading

XU Wei-Wei, TANG Zhi-Ping, ZHANG Xing-Hua

2006, 20(4): 365-371 . doi: 10.11858/gywlxb.2006.04.005

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Abstract:
The rules regarding the propagation of irreversible phase boundaries along a finite rod are investigated with a phase transition constitutive model based on the simple mixture theory. The results show that the boundary and loading/unloading conditions strongly affect the propagation pattern of the p...

Valence Electron Structure Analysis of Catalyst during Diamond Synthesis under HPHT

LI Li, XU Bin, GONG Jian-Hong, LI Mu-Sen

2006, 20(4): 372-378 . doi: 10.11858/gywlxb.2006.04.006

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Abstract:
Experimental results showed that the Me3C (Me means Fe, Ni) pattern carbides produced by the action of catalyst and graphite are main carbon source to form diamond structure under high temperature and high pressure (HPHT). In this paper, based on the empirical electron theory of solids and molecules...

A Combined Discrete/Finite Element Method in Shock Dynamics

FU Hua, LIU Cang-Li, WANG Wen-Qiang, LI Tao

2006, 20(4): 379-385 . doi: 10.11858/gywlxb.2006.04.007

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Abstract:
A combined discrete element method (DEM) and finite element method (FEM) is presented. A 2D program is developing for application to mesoscale simulation of heterogeneous and homogeneous material under shock loading, and the numerical simulations are testified. The results of simulation are in agree...

Compression Isentropes of Aluminum and Copper up to 200 GPa

MO Jian-Jun, SUN Cheng-Wei

2006, 20(4): 386-390 . doi: 10.11858/gywlxb.2006.04.008

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Abstract:
The equation of compression isentropes derived from linear and quadratic Hugoniot curves has been obtained by employing the Hugoniot as the reference of Grneisen EOS as well as from p=f(e,v) form EOS directly. The compression isentropes of aluminum and copper are calculated with both Grneisen and Ap...

Synthesis of Large Bulk MgSiO3 Perovskite and (Mg,Fe)O Ferropericlase at High-Pressure and High-Temperature

ZHANG Li, GONG Zi-Zheng, FEI Ying-Wei

2006, 20(4): 391-396 . doi: 10.11858/gywlxb.2006.04.009

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Abstract:
MgSiO3 perovskite and ferropericlase (Mg,Fe)O are generally considered as the most dominant components in the Earth's lower mantle. The experimental data of these phases at high pressures and high temperatures play a key role to constrain the composition of the Earth's lower mantle. However, high pr...

An Issue in the Numerical Simulation for Non-Ideal Detonation Propagation in Body-Fitted Coordinate Systems

ZHONG Min, CHEN Sen-Hua, LI Ping

2006, 20(4): 397-402 . doi: 10.11858/gywlxb.2006.04.010

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Abstract:
The Level Set method in body-fitted coordinate for propagation of non-ideal detonation is studied. According to the Hamilton-Jacobi formulation of the Godunov's scheme, we studied finite difference method for the propagation equation of non-ideal detonation in non-orthogonal body-fitted coordinate s...

Study of Pulsed Large Current Out-Put of Shock-Activated Energy Transducer

DU Jin-Mei, ZHANG Fu-Ping, ZHANG Yi, WANG Hai-Yan

2006, 20(4): 403-407 . doi: 10.11858/gywlxb.2006.04.011

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Abstract:
The PZT 95/5 ferroelectric ceramics with niobium doped was assembled into the shock-activated energy transducer. Based on the explosive to electric energy transfer theory, the large pulse of electrical current output was investigated under the action of shock wave in normal mode, and the electrical ...

Numerical Simulations of the Penetration of Aluminum Targets by Ogive-Nosed Steel Projectiles

HE Tao, WEN He-Ming

2006, 20(4): 408-414 . doi: 10.11858/gywlxb.2006.04.012

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Abstract:
Numerical simulations are conducted herein on the penetration of aluminum targets by ogival-nosed steel projectiles using the commercial FEM code ABUQUS. In the simulations, the response of the targets are represented by a forcing function, which is derived from spherical cavity expansion theory. Th...

Structure Evolution and Transport Properties of La2-xSmxCuO4 at High Pressure

WU Yun-Long, SONG Chun-Mei, XIONG Yu-Feng, LI Lai-Feng

2006, 20(4): 415-420 . doi: 10.11858/gywlxb.2006.04.013

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Abstract:
The structure evolution and transport properties of La2-xSmxCuO4 synthesized both at atmosphere pressure and high pressure have been studied. The crystal structure changed from T phase to the T phase. Following treatment in high pressure of 6 GPa in 850 ℃, a slight modification in the lattice consta...

Research on Mutation in Rice (Oryza Sativa L.) Induced by High Hydrostatic Pressure

LI Gui-Shuang, BAI Cheng-Ke, DUAN Jun, PENG Chang-Lian

2006, 20(4): 421-428 . doi: 10.11858/gywlxb.2006.04.014

PDF (941)

Abstract:
Seeds of three rice (Oryza sativa L.) cultivars, Yuexiangzhan, Yuefengzhan and Ce 64, were soaked for 10 h, and then were treated by high hydrostatic pressure (78 MPa) for 12 h. The seedlings of high-pressure treatment and control were transplanted in the field after sowing of 30 d. Mutation type of...

Numerical Simulation for Formation Flight and Penetration of Sphericity EFP

YANG Jun, JIANG Jian-Wei, MEN Jian-Bing

2006, 20(4): 429-433 . doi: 10.11858/gywlxb.2006.04.015

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Abstract:
With AUTODYN-2D code, the formation, flight and penetration processes of sphericity explosively formed projectile (EFP) are simulated. The influence of curvature of liner impose on formation of EFP is studied, and the flight velocity field of EFP is revealed. By analyzing the v-t curve, the attenuat...

Expanding Fracture of Beryllium Bronze Cylinder Shell

JIN Shan, TANG Tie-Gang, LI Qing-Zhong, SUN Xue-Lin, XU Yong-Bo, SHA Gui-Ying

2006, 20(4): 434-438 . doi: 10.11858/gywlxb.2006.04.016

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Abstract:
High-speed camera and optical microscope were used to study the expanding fracture characteristic of the beryllium bronze (QBe2) cylinder shell under detonation loading. The experimental result show that the static mechanics characteristics and the dynamic fracture characteristic of the material dep...

SEM Observation of Large Polymer Extended-Chain Crystals in High-Pressure Crystallized PET/PC Blends

Lü Jun, HE Yang, LI Liang-Bin, HUANG Rui

2006, 20(4): 439-444 . doi: 10.11858/gywlxb.2006.04.017

PDF (555)

Abstract:
Large polymer extended-chain crystals have an important role that cannot be replaced in the study on low dimensional systems of physics. However, the small size of polymer extended-chain crystals that formerly had to be obtained through a long time confined their effect. Adding 10% (mass fraction) P...

Study on Compression Stage in Two-Stage Light Gas Gun

WU Jing, LAN Qiang, WANG Qing-Song, XIAN Hai-Feng, JIA Lu-Feng, FU Qiu-Wei

2006, 20(4): 445-448 . doi: 10.11858/gywlxb.2006.04.018

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Abstract:
Experiment was done to study on the effect of big diaphragm between powder chamber and pump tube in two-stage light gas gun with diameter of 25 mm. The differences of interior ballistics with diaphragm and diaphragmless are observed at the same filling parameters. Theoretical calculation and experim...

2006 Vol. 20, No. 4

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