Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel Notice on the organization of advanced research class on high-pressure science and new materials of engineering knowledge of professional and technical personnel

2007 Vol. 21, No. 2

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Numerical Modeling of Spallation Experiments of Tantalum
JIANG Song-Qing, LIU Wen-Tao
2007, 21(2): 113-120 . doi: 10.11858/gywlxb.2007.02.001
PDF (621)
Abstract:
A phenomenological model, which includes nonlinear elasticity (equation of state), rate-dependent plasticity, and void nucleation and growth, is provided for modeling the spallation behavior of tantalum. An implicit numerical technique, diagonally implicit Runge-Kutta method, is used to solve the co...
Theoretical Study on the Penetration and Perforation of FRP Laminates Struck by Cone-Nosed Projectiles
QIN Yue, WEN He-Ming, HE Tao
2007, 21(2): 121-128 . doi: 10.11858/gywlxb.2007.02.002
PDF (657)
Abstract:
The penetration and perforation of FRP laminates struck transversely by cone-nosed projectiles has been theoretically investigated. Based upon the assumption that the deformation is localized, the mean pressure offered by the laminate targets to resist the projectiles can be decomposed into two part...
Dynamic Strength of Alumina under Plane Shock Waves
LIU Zhan-Fang, CHANG Jing-Zhen, TANG Lu-Cheng, YAO Guo-Wen, LI Jian-Peng
2007, 21(2): 129-135 . doi: 10.11858/gywlxb.2007.02.003
PDF (891)
Abstract:
The strength expression of material under shock loading has been reviewed. The effects of the hydrostatic pressure and the high strain rate on the strength, has been discussed. A modified form for the Hugoniot elastic limits was given associated with the Drucker-Prager yield criterion. Free surface ...
Research of Fragmentation of Nano-Ceramic Powders during Explosive Consolidation Process
ZHANG Yue-Ju, LI Xiao-Jie, YAN Hong-Hao, QU Yan-Dong, TAO Yu-Xiong
2007, 21(2): 136-144 . doi: 10.11858/gywlxb.2007.02.004
PDF (710)
Abstract:
In explosive consolidation of nano-powders, the duration in which the loading changed markedly on nano-particles by shock wave is far longer than the time of stress wave propagating through the character length of the particles; and the ceramic powders behave brittleness during explosive shock conso...
Dynamic Analysis of Helium Bubble Growth in the Pure Al under High Strain-Rate Loading
QI Mei-Lan, HE Hong-Liang, WANG Yong-Gang, YAN Shi-Lin
2007, 21(2): 145-150 . doi: 10.11858/gywlxb.2007.02.005
PDF (698)
Abstract:
Based on the dynamic process of helium bubble growth under high strain-rate, the dynamic equation of helium bubble growth has been presented. The effects of internal pressure of helium bubble, inertia, viscosity, surface tension of base material and environment temperature on helium bubble with 1 nm...
Numerical Investigations of Detonation Induced by Implosion Flame inResonator Cavity
GUI Ming-Yue, FAN Bao-Chun, DONG Gang, YU Lu-Jun
2007, 21(2): 151-156 . doi: 10.11858/gywlxb.2007.02.006
PDF (628)
Abstract:
Based on the two-dimensional axisymmetric Euler equations coupling with chemical reactions, the phenomena of implosion combustion for hydrogen-air mixture were numerically studied by using wave propagation algorithm with Superbee limiter in resonator cavity. The effects of resonator shapes on initia...
Failure Modes of Ductile Metal Plates under Normal Impact by Flat-Ended Projectiles
PAN Jian-Hua, WEN He-Ming
2007, 21(2): 157-164 . doi: 10.11858/gywlxb.2007.02.007
PDF (1084)
Abstract:
This paper examines the failure modes of ductile metal plates subjected to impact by rigid flat-ended projectiles at normal incidence. General speaking, there are two failure modes which can occur in a ductile metal plate: simple shear failure with global deformation, and localized adiabatic shear p...
Three-Dimensional Numerical Simulation of the High Velocity Rod-Shaped Projectile
LI Cheng-Bing, PEI Ming-Jing, SHEN Zhao-Wu
2007, 21(2): 165-172 . doi: 10.11858/gywlxb.2007.02.008
PDF (729)
Abstract:
The software of LS-DYNA was applied to simulate the formation process of a high velocity rod-shaped projectile from the modified hemispherical liner. Its formation mechanism was analyzed. It was demonstrated that the initiation methods such as center point initiation, four-point initiation and perip...
Experiment Research of Nano Manganese Ferrite Powders Prepared by Detonation Method
WANG Xiao-Hong, LI Xiao-Jie, ZHANG Yue-Ju, QU Yan-Dong, SUN Gui-Lei, XIE Xing-Hua
2007, 21(2): 173-177 . doi: 10.11858/gywlxb.2007.02.009
PDF (768)
Abstract:
Nanometer-sized MnFe2O4 powders were synthesized by detonation of two kinds of emulsion explosives with different oxygen balance (OB) values. The phase structure and the different components of the two samples obtained from the emulsion explosives were characterized and compared by X-ray diffraction...
Discussion on Shear Modulus of Materials at Solid-Liquid Phase Region
RAN Xian-Wen, TANG Wen-Hui, TAN Hua, DAI Cheng-Da
2007, 21(2): 178-182 . doi: 10.11858/gywlxb.2007.02.010
PDF (645)
Abstract:
From theoretical and experimental aspects, the shear modulus of material at the solid-liquid phase region was discussed when the material has attained its phase transition equilibrium and concluded that the shear modulus did not equal to zero as soon as the material began to melt. Using percolation ...
Non-Fourier Energy Transport in Silicon Thin Films during Femtosecond Laser Heating
LIU Guo-Dong, LUO Fu, WANG Gui-Bing
2007, 21(2): 183-187 . doi: 10.11858/gywlxb.2007.02.011
PDF (717)
Abstract:
A numerical model which is based on the hyperbolic two-step model is developed to investigate the microscopic energy transport in silicon thin films during ultra-fast laser heating. It is observed that, electrons dominate energy transport within a few picoseconds. The coupling processes between elec...
Dynamic Behavior of -Zirconium at Low Pressure
LI Ying-Hua, CAI Ling-Cang, ZHANG Lin, LI Ying-Lei
2007, 21(2): 188-192 . doi: 10.11858/gywlxb.2007.02.012
PDF (673)
Abstract:
The stress-strain curves of the -zirconium which strain rate ranges from 3.310-4 s-1 to 1.5103 s-1 under room temperature were obtained, and the parameters of Johnson-Cook model were determined through these experiments. The computed free-surface velocity profiles using dynamic damage and fracture m...
Simulation of Combustion Process in the Electric Squib
ZHU Ming-Shui, HE Bi, JIANG Xiao-Hua, JIANG Ming
2007, 21(2): 193-198 . doi: 10.11858/gywlxb.2007.02.013
PDF (689)
Abstract:
Based on two phase flow model of interior ballistics, considered that the weight of ignition charge is comparable with the secondery charge and many of its products are solid, the so called four phase flow model of interior ballistics adaptive to the combustion process in the electric squib has been...
Influence of the Parameter of Explosive Welding Caused by the Slope of Fly Plate at Static Load
FU Yan-Shu, SUN Yu-Xin, WANG Jin-Xiang, RONG Guang
2007, 21(2): 199-204 . doi: 10.11858/gywlxb.2007.02.014
PDF (653)
Abstract:
Explosive welding is a solid state fusion welding process in which the joining of two metals is accomplished by the application of the pressure released by the detonation of an explosive layer. It is widely used to manufacture material sandwich components. But when explosive was set on a thin fly pl...
Does There Exist a Solid-Solid Transformation in Shocked Iron at around 200 GPa?
HUANG Hai-Jun, CAI Ling-Cang, TIAN Xu
2007, 21(2): 205-209 . doi: 10.11858/gywlxb.2007.02.015
PDF (891)
Abstract:
A theoretical Hugoniot curve of iron has been calculated based on Grneisen equation of state and internal energy conservation consideration, using a set of optimized or thermophysical parameters and both - and liquid-iron models. This determined Hugoniot curve is well in accord with the revised Hugo...
Shock Compression Behavior of Nd2Fe14B
LI Qiao-Yan, SHI Shang-Chun, YANG Jin-Wen, SUN Yue
2007, 21(2): 210-214 . doi: 10.11858/gywlxb.2007.02.016
PDF (629)
Abstract:
The shock compression properties for permanent magnet Nd2Fe14B were studied in the shock pressure range of 19~78 GPa, using a two-stage light-gas gun. The Hugoniot data of Nd2Fe14B with initial average density 7.346 g/cm3 were measured by the impedance matching method. The experiment results indicat...
Raman Scattering Study of Colloidal MoS2 under High Pressure
ZHAO Ya-Jun, ZHANG Zeng-Ming, DING Ze-Jun, ZHANG Quan
2007, 21(2): 215-219 . doi: 10.11858/gywlxb.2007.02.017
PDF (909)
Abstract:
Raman spectra of colloidal MoS2 powder with the average diameter of 4 m under high pressures were measured. The experimental results indicate that the Raman bands shift to higher wavenumbers with the increase of pressure, while the intensity decreases and the FWHM increases. The mode Grneisen consta...
Electric Properties of ZnO Nanowires under High Pressure
LI Jin-Lai, WU Zhen-Yu, BAO Zhong-Xing, ZOU Bing-Suo, FENG Ya-Qing
2007, 21(2): 220-224 . doi: 10.11858/gywlxb.2007.02.018
PDF (688)
Abstract:
The R-p and C-p relationship of ZnO nanowires were determined by diamond anvil cell (DAC), and compared with those of ZnO nanocrystals and bluk materials in the previous experiments. Our results show that a phase transition began at the pressure of 5.0 GPa. The resistance under pressure decreased an...

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