高压物理学报

Research on Contact Algorithm between Smoothed Particle Hydrodynamics and Finite Element Method

ZHANG Zhi-Chun, QIANG Hong-Fu, GAO Wei-Ran

2011, 25(2): 97-103 . doi: 10.11858/gywlxb.2011.02.001

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Abstract:
The coupling between smoothed particle hydrodynamics (SPH) and finite element method (FEM) is an effective approach for the simulation of impact dynamics. An alternative algorithm for the treatment of contact problem between SPH particles and finite elements was employed. Background particles were a...

High-Pressure Synthesis and Properties Characterization of ZrN-ZrB2 Nanocomposites

LU Feng-Guo, QIU Li-Xia, DING Zhan-Hui, GUO Xing-Yuan, Lü Yang, ZHAO Xu-Dong, LIU Xiao-Yang

2011, 25(2): 104-110 . doi: 10.11858/gywlxb.2011.02.002

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Abstract:
Combining high-energy ball milling and high-pressure high-temperature technique, high-dense ZrN-ZrB2 nanocomposites have been synthesized using Zr and h-BN powders as raw materials. The structures of product materials were studied through X-ray diffraction, high resolution transmission electron micr...

Detonation Synthesis of Carbon-Encapsulated Nickel Nanoparticles

LUO Ning, LI Xiao-Jie, FEI Hong-Lu, MO Fei, ZHANG Cheng-Jiao

2011, 25(2): 111-117 . doi: 10.11858/gywlxb.2011.02.003

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Abstract:
Carbon-encapsulated nickel nanoparticles (CENNPs) with core-shell structure were synthesized by detonation method using homemade composite explosives with negative oxygen balance. The detonation chemical reaction was initiated by a nonel tube detonator in a closed explosion vessel filled with nitrog...

Influence of Crystallization Degree of h-BN on Synthesis of c-BN

JI Xiao-Rui, YANG Da-Peng, YANG Xiao-Hong, ZHANG Tie-Chen

2011, 25(2): 118-122 . doi: 10.11858/gywlxb.2011.02.004

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Abstract:
High pressure and temperature pretreatments were employed for the mixture of Li3N and hexagonal boron nitride (h-BN) powders with different crystallization degrees. Using the pretreated h-BN and Li3N, the cubic boron nitride (c-BN) was synthesized by a cubic-anvil press. According to the X-ray diffr...

Study on High-Pressure Phase Transition of Hexagonal B-C-N Compound

YANG Jie, LI Ming, LIN Peng, YU Dong-Li, HE Ju-Long

2011, 25(2): 123-127 . doi: 10.11858/gywlxb.2011.02.005

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Abstract:
Using in situ high-pressure synchrotron X-ray diffraction and diamond anvil cell (DAC) techniques, the phase transition and physical characteristics of B0.47C0.23N0.30 compound were observed in the pressure range of 1.4~30 GPa. The experimental results showed that the B-C-N compound experiences a ph...

Sound Velocity Measurement of Mesoscale Objects Using Laser Ultrasonics Technique

MA Yun, ZHANG Yi, LI Jia-Bo, CAI Ling-Cang, LI Jian-Feng, WANG Xiang, WENG Ji-Dong, LI Jun, JING Qiu-Min

2011, 25(2): 128-132 . doi: 10.11858/gywlxb.2011.02.006

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Abstract:
A laser-based ultrasound system was designed and built to measure the sound velocity of mesoscale (tens of micrometer- to millimeter-sized) objects. The system uses a Q-switch laser with 6.3 ns pulse width for excitation of broadband ultrasonic waves, and an optical fiber displacement interferometer...

Application of Laser Velocity Interferometry in Interior Ballistic Projectile Velocity Measurement

WANG De-Tian, PENG Qi-Xian, LIU Jun, MENG Jian-Hua, LIU Shou-Xian, CHEN Guang-Hua, LIU Qiao, DENG Xiang-Yang

2011, 25(2): 133-137 . doi: 10.11858/gywlxb.2011.02.007

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Abstract:
Using a laser velocity interferometer system for any reflector (VISAR) and a fiber displacement interferometer (FDI), the interior ballistic projectile velocity for rifle cannon was measured. According to the interference signal obtained directly from VISAR and FDI, whose persistence time is 491 s, ...

One-Dimensional Gas-Phase Reaction Model of Laser-Induced Ignition of RDX

TIAN Zhan-Dong, ZHANG Zhen-Yu, LU Fang-Yun, TAN Fu-Li

2011, 25(2): 138-142 . doi: 10.11858/gywlxb.2011.02.008

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Abstract:
Based on the work of Liau et al., a one-dimensional gas-phase reaction model of laser-induced ignition of RDX was established by considering the variations of physical parameters with temperature and component concentration. Using this gas-phase reaction model and finite difference method, the ignit...

Structure and Properties Modulation of RMnO3 Multiferroic Materials by Average Ionic Radius at A-Site

FENG Shao-Min, WANG Li-Juan, ZHU Jin-Long, LIU Qing-Qing, LI Feng-Ying, JIN Chang-Qing

2011, 25(2): 143-146 . doi: 10.11858/gywlxb.2011.02.009

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Abstract:
The effects of internal chemical pressure produced by A-site ionic radius were investigated for the Ho1-xDyxMnO3 system. It is found that the hexagonal HoMnO3 is gradually transformed to orthorhombic perovskite structure as reducing A-site ion size, forming three regions which contain pure hexagonal...

A Preliminary Study on Conductivity of Serpentinite at High Pressure and High Temperature

LIU Zai-Yang, WANG Duo-Jun, LI He-Ping, GUO Ying-Xing, YU Ying-Jie

2011, 25(2): 147-152 . doi: 10.11858/gywlxb.2011.02.010

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Abstract:
Using an AC impedance spectroscopy within the frequency ranges of 0.1～106 Hz, the electrical conductivities of serpentinite were determined from 373 K to 933 K and at 2.0 GPa and 4.0 GPa respectively. The conduction mechanisms of serpentinite before and after dehydration were also analyzed. The expe...

Phase Transition and Reverse Transition in FeMnNi Alloy

CHEN Yong-Tao, LI Qing-Zhong, TANG Xiao-Jun, LIU Wen-Tao

2011, 25(2): 153-158 . doi: 10.11858/gywlxb.2011.02.011

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Abstract:
By means of VISAR, the phase transition and reverse phase transition in FeMnNi alloy under different pressures were studied through direct impact and reverse impact experiments. As the difference between shock pressure and phase transition threshold is larger than reverse transition threshold, namel...

Research on the Dynamic Behavior of a PBX Explosive

LI Jun-Ling, LU Fang-Yun, FU Hua, ZHAO Yu-Gang, TAN Duo-Wang

2011, 25(2): 159-164 . doi: 10.11858/gywlxb.2011.02.012

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Abstract:
PBX explosive is the main charge of modern weapons, so its mechanical behavior determines the survival ability of weapons. To study the dynamic behavior of PBX explosive, a series of split Hopkinson pressure bar (SHPB) tests for PBX explosive have been carried out. With combination of the semiconduc...

Research on Performance of the Underwater Air Buffer Weakening Shock Wave

YAO Xiong-Liang, YANG Wen-Shan, CHU Wen-Hua, ZHANG A-Man

2011, 25(2): 165-172 . doi: 10.11858/gywlxb.2011.02.013

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Abstract:
Based on the characteristics of the damage on the ship caused by the torpedo, the numerical model of multi-medium underwater explosions was established, where the methods of treating interface and calculating generalized smooth length were presented. According to this new model, the programs of mult...

Numerical Simulation of the Oblique Collision in Explosive Welding

LI Xiao-Jie, MO Fei, YAN Hong-Hao, ZHANG Cheng-Jiao

2011, 25(2): 173-176 . doi: 10.11858/gywlxb.2011.02.014

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Abstract:
Using the software of ANSYS/LS-DYNA 11.0 and the method of smoothed particle hydrodynamics (SPH), the formation process of the oblique collision in explosive welding was simulated, where the elastic-plastic hydrodynamic model with the material strength was used. The simulation results showed that th...

An Application of PIV Technique in Gas Interfacial Instability Experiment

GAO Ning, ZHANG Guang-Sheng, LIN Jun

2011, 25(2): 177-182 . doi: 10.11858/gywlxb.2011.02.015

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Abstract:
An experimental investigation on gas interfacial instability was carried out with particle image velocimetry (PIV) technique. The evolution images and two dimensional velocity field of a shock-accelerated heavy gas cylinder in air were experimentally measured utilizing glycol fog droplets as trackin...

Void Growth and Local Temperature Rise in Necking Region of OFHC Ring

GUI Yu-Lin, SUN Cheng-Wei, ZHANG Guang-Sheng, LI Qiang

2011, 25(2): 183-187 . doi: 10.11858/gywlxb.2011.02.016

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Abstract:
The fragmentation tests of high-conductivity oxygen-free copper (M-state TU1) rings have been carried out by the electromagnetically driven expanding ring technique. Using a metallographic microscope, the void growth and coalescence were observed in the necking region of recovery fragment. The void ...

Experimental Study on the Influences of Defects on Expanding Fracture of a Metal Cylinder

JIN Shan, ZHANG Shi-Wen, LONG Jian-Hua

2011, 25(2): 188-192 . doi: 10.11858/gywlxb.2011.02.017

PDF (579)

Abstract:
By means of high-speed frame photography, clear images of the expanding fracture of two metal cylinders with and without a notch were obtained. The experimental results showed that the notch defect would significantly accelerate the fracture process of the cylinder. For the metal cylinder containing...

2011 Vol. 25, No. 2

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