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

2005 Vol. 19, No. 3

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The Constitutive Relationship between High Pressure-High Strain Rate and Low Pressure-High Strain Rate Experiment
CHEN Da-Nian, LIU Guo-Qing, YU Yu-Ying, WANG Huan-Ran, XIE Shu-Gang
2005, 19(3): 193-200 . doi: 10.11858/gywlxb.2005.03.001
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Abstract:
It is indicated that the constitutive equations at high strain rates proposed by Johnson-Cook(J-C), Zerilli-Armstrong (Z-A) and Bodner-Parton (B-P) collapse the data of flow stress in compression, tension, torsion, and shear into simple curve with the scalar quatities 'effective' stress and 'effecti...
A New Statistical Meso-Scopic Damage Model and Its Applications in Spalling Processes
ZHOU Hong-Qiang, QIN Cheng-Sen, ZHANG Shu-Dao, ZHANG Feng-Guo, LIU Wen-Tao, WANG Pei
2005, 19(3): 201-205 . doi: 10.11858/gywlxb.2005.03.002
PDF (862)
Abstract:
A new damage evolution equation for ductile materials is presented based on the statistical meso-scopic damage mechanism, which consistent well with the results of analysing the mechanical responses for the spherical cell containing a single central spherical void. The model presented is incorporate...
Study on Sound Velocity and Unloading Path for Single Crystal LiF under Shock Compression
YU Jin-Quan, XIAO Ya-Bin, ZHOU Xian-Ming, TAN Hua
2005, 19(3): 206-212 . doi: 10.11858/gywlxb.2005.03.003
PDF (887)
Abstract:
Symmetrical impact experiments for single crystal LiF were conduced at two-stage light-gas gun with a VISAR diagnostic. Longitudinal and bulk sound velocities, and unloading path of LiF were obtained up to 79.1 GPa shock pressure. Experimental results indicate a good linearity between the Lagrangian...
Microstructure Fractural Characteristics of Energetic Materials under Compressive Loading
WU Hui-Min, LU Fang-Yun, LU Li, WANG Zhi-Bing
2005, 19(3): 213-218 . doi: 10.11858/gywlxb.2005.03.004
PDF (613)
Abstract:
The fractural surfaces of the compression tested specimens have been observed by scanning electron microscope (SEM). Microstructure fractural characteristics of three energetic materials under compressive loading at different strain rates are obtained. Based on the material composition, the fractura...
A Study on the Spallation Behavior of Silicon Nitride
XIAO Gui-Feng, TANG Zhi-Ping, ZHOU Chang-Guo, HU Xiao-Jun, CAI Jian
2005, 19(3): 219-224 . doi: 10.11858/gywlxb.2005.03.005
PDF (842)
Abstract:
Shock behavior of silicon nitride ceramic was investigated by using a onestage light gas gun facility. A new technique is developed to measure the spall characteristics of materials with embedded electro-magnetic particle velocity gauges in the sample. This method measures the particle velocity pro...
Equation of State of Cassiterite at Room Temperature and up to 13 GPa
JIANG Xi, ZHOU Wen-Ge, LIU Yong-Gang, XIE Hong-Sen, ZHANG Huan, LIU Jing, MA Mai-Ning, LI Xiao-Dong, LI Yan-Chun
2005, 19(3): 225-229 . doi: 10.11858/gywlxb.2005.03.006
PDF (859)
Abstract:
At room temperature and up to 13 GPa, in situ energy dispersive X-ray diffraction measurements for a natural cassiterite, collected from Gejiu tin deposits, Yunnan, were performed by using diamond anvil cell instrument with synchrotron radiation at BSRF. The results show that cassiterite is stable u...
Experimental Investigation on the Detonation Cellular Structure Caused by C5~C6 Cloud Fuel Mixtures
HE Xiao-Bo, XIE Li-Feng, PENG Jin-Hua
2005, 19(3): 230-234 . doi: 10.11858/gywlxb.2005.03.007
PDF (935)
Abstract:
The detonation cellular structures caused by C5~C6 cloud fuel mixtures are studied under the initial atmospheric pressure and room temperature by improved soot foil technique. Sharp cellular patterns are obtained. Meanwhile, the effect of equivalence ratio and initiation energy on the detonation cel...
Activities of Antioxidative Enzymes and the Responds to Cold Stress of Rice Treated by High Hydrostatic Pressure
BAI Cheng-Ke, LI Gui-Shuang, DUAN Jun, PENG Chang-Lian, WENG Ke-Nan, XU Shi-Ping
2005, 19(3): 235-240 . doi: 10.11858/gywlxb.2005.03.008
PDF (1059)
Abstract:
Rice seeds (Oryza sativa L. cv. Yuexiangzhan) were soaked for 10 h or not soaked, then exposed to 75 MPa high hydrostatic pressure (HHP) for 12 h. The seeds treated by HHP and their control were sowed in the field. Activities of antioxidative enzymes (SOD, AsA-POD) in the leaves, Rubisco content, Fv...
Effect of High Pressure on Seed Germination and Seedling Growth of Wheat
LIANG Ling, ZHANG Zheng-Mao, DUAN Xu-Chang, YANG Gong-Ming, LI Guo-Long
2005, 19(3): 241-246 . doi: 10.11858/gywlxb.2005.03.009
PDF (929)
Abstract:
Using the wheat seed of Yumai No.18 as material, the effect of high pressure on seed germination and seedling growth of wheat was preliminary studied, and seedling growth of wheat that treated under 95 MPa pressure in various time was investigated.Results showed that, in 50~95 MPa pressure, all vacu...
Behaviors of Initiation and after-Initiation for Homogeneous Explosives
LI Yin-Cheng
2005, 19(3): 247-256 . doi: 10.11858/gywlxb.2005.03.010
PDF (812)
Abstract:
Campbell's experimental studies of behaviors of initiation and after-initiation for homogeneous explosives were introduced and analyzed, but initiation conditions were not dealt with. Campbell's experimental results showed that detonation originated at the gap-explosive interface some microseconds o...
Analysis of High-Velocity Tungsten Rod on Penetrating Brittle Target
WANG Yan-Bin, LI Jiu-Hong, WEI Xue-Ying, YU Mao-Hong
2005, 19(3): 257-263 . doi: 10.11858/gywlxb.2005.03.011
PDF (896)
Abstract:
Brittle materials can be pulverized near the tip of the penetrator under high-velocity impact. This paper considers the pulverization of brittle materials and divides the target into the pulverized, cracked and elastic regions, and derived the cavity expansion pressure, viz. target resistance Rt of ...
The Least Absolute Value Linear Fitting of D-u Line
CHEN Xiu-Fang, CHEN Gao-Bo, GONG Zi-Zheng
2005, 19(3): 264-268 . doi: 10.11858/gywlxb.2005.03.012
PDF (848)
Abstract:
The Linear relationship between shock wave velocity D and particle velocity u is very important to obtain high pressure equation of state and dynamic properties of materials under shock loading. In this paper, the least absolute value method is adopted to fit the D-u line of several kinds of materia...
Study on the Technique of Electric Gun Loading for One Dimensionally Planar Strain
WANG Gui-Ji, ZHAO Jian-Heng, TANG Xiao-Song, TAN Fu-Li, WU Gang, LIU Hai-Tao, KUANG Xue-Wu
2005, 19(3): 269-274 . doi: 10.11858/gywlxb.2005.03.013
PDF (950)
Abstract:
The designing principles are discussed based on the analyses of discharging circuit of electric gun. According to those, an electric gun with the energy of 14.4 kJ is designed and established. The measuring results show that the parameters of the electric gun, for example, the inductance is less tha...
Review on the Simulation of Detonation Products Equation of State by Monte Carlo Method
MA Yi-Gang, LI Sheng-Cai
2005, 19(3): 275-278 . doi: 10.11858/gywlxb.2005.03.014
PDF (928)
Abstract:
In this paper, the background and progress of Monte Carlo method, which is used to simulate the equation of state of detonation products directly at atoms level, is reviewed. The expression of the macroscopic values, the computation of the statistical average, the selection of the potential function...
Broad Pulse Forming Circuit and Its Application
WANG Xiang, JIA Lu-Feng, FU Qiu-Wei, MA Yun
2005, 19(3): 279-283 . doi: 10.11858/gywlxb.2005.03.015
PDF (700)
Abstract:
A measurement technique of electrical shorting pins based on broad pulse forming circuit is described here. The problem of pins shorting advance can be solved with this technique in place of the conventional narrow pulse forming circuit. The results of simulations and experiments show that the arriv...
The Time Response Character of Two Types of Fiber-Optic Pin under Shock Wave Loading
WANG Rong-Bo, HE Li-Hua, TIAN Jian-Hua, WU Ting-Lie, YE Yan, LI Ze-Ren
2005, 19(3): 284-288 . doi: 10.11858/gywlxb.2005.03.016
PDF (804)
Abstract:
Two types of fiber-optic pin have been developed for measuring shock wave physics characters in strong electromagnetic environment and low shock pressure experiments. One is the shock self-luminescene fiber-optic pin, and the other is the flash-gap fiber-optic pin. The physical mechanism of the fibe...

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