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

2000 Vol. 14, No. 3

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Pressure Effects on Magnetic Properties of La2/3Ca1/3MnO3+ Thin Films
LIU Zhen-Xing, FEI Yang, MENG Xian-Ren, HUANG Kang-Quan
2000, 14(3): 161-165 . doi: 10.11858/gywlxb.2000.03.001
PDF (582)
Abstract:
Pressure effects on LaCaMnO thin films were studied experimentally. The results show that the resistivity and transition temperature of rich-oxygen samples are not sensitive to pressure. Based on the experimental results on the effects of pressure and temperature on CMR LaCaMnO samples, it is found ...
Experimental Scaling of the Melting Curve for Metals under High Pressure
LI Mao-Sheng, CHEN Dong-Quan
2000, 14(3): 166-170 . doi: 10.11858/gywlxb.2000.03.002
PDF (560)
Abstract:
The investigation of melting curve Tm() under high pressures has practical applications both for temperature induced softening of yield strength of materials and for the reasonable partitioning of the hot contributions from that of cold part. In this paper, we make use of the experimental results of...
Travel Time Measurement in Tungsten Carbide Anvil under High Pressure
ZHOU Wen-Ge, XIE Hong-Sen, LIU Yong-Gang, GUO Jie, XU Zu-Ming
2000, 14(3): 171-175 . doi: 10.11858/gywlxb.2000.03.003
PDF (673)
Abstract:
Travel time in WC anvils was measured using pulse reflect method at room temperature and under cell pressure up to 3.0 GPa. Experimental results indicate that the travel time in the WC anvils decreased linearly with cell pressure. A possible reason for this result is that the anvil was compressed du...
The Equation of State for Condensed Deuterium
CHEN Qi-Feng, CAI Ling-Cang, WANG Wei, FU Qiu-Wei, CHEN Dong-Quan, JING Fu-Qian
2000, 14(3): 176-181 . doi: 10.11858/gywlxb.2000.03.004
PDF (633)
Abstract:
Spectral radiance histories from the shocked deuterium samples were studied experimentally using pyrometer. Hugoniot data and temperatures of deuterium were deduced. The dissociation and ionization equilibrium method was applied to calculate the equation of state and the composition of deuterium (D2...
Study of Stress Wave Propagation in Laminated Media Using MOC
XU Ming-Li, ZHANG Ruo-Qi, ZHANG Guang-Ying
2000, 14(3): 182-188 . doi: 10.11858/gywlxb.2000.03.005
PDF (699)
Abstract:
MOC (method of cell) is a new means of investigating the problem of wave propagation in materials with complex interior unit structure. The MOC can be used to investigate transient waves due to pulse loading as well as harmonic waves. MOC was introduced, then, it was used to simulate the problem of ...
The Numerical Simulation of Electric Response of PZT95/5 Ferroelectric Ceramics Subjected to Shock Loading
HE Yuan-Ji, ZHANG Ya-Zhou, LI Chuan-Lu, WANG Hong-Gang
2000, 14(3): 189-194 . doi: 10.11858/gywlxb.2000.03.006
PDF (646)
Abstract:
A mathematical model of PZT95/5 ferroelectric ceramics subjected to normal explosive shock loading was suggested. The dielectric relaxation and finite resistive of PZT95/5 were taken into account in this model. Electric equations of PZT95/5 in cases of short circuit, resistive, capacitive and induct...
Study of Numerical Simulation for Quasi-Isentropic Compression
HUA Jin-Song, JING Fu-Qian, GONG Zi-Zheng, TAN Hua, XU Nan-Xian, DONG Yu-Bin, CHEN Dong-Quan
2000, 14(3): 195-202 . doi: 10.11858/gywlxb.2000.03.007
PDF (671)
Abstract:
This article describes the numerical simulation for shock compression which is produced by layered flyers impacting target, in which the isentropic curve is calculated by recurrence method. Take water and tantalum for examples, the calculation results show this kind of flyers can produce good effect...
Damage Evolution of PBX under Simple Tension
LUO Jing-Run, LI Da-Hong, ZHANG Shou-Qi, ZHAO Fang-Fang, ZHAO Yu-Hua
2000, 14(3): 203-208 . doi: 10.11858/gywlxb.2000.03.008
PDF (644)
Abstract:
The nonlinearity of PBX mechanical behaviors under simple tension was treated as the result of damage evolution, and damage parameter was measured experimentally. A damage evolution equation was derived. The prediction from the constitutive relation including elastic damage effect agrees well with t...
Ruby Luminescence R-Line Shift under Shock Loading
PENG Qi-Xian, HU Shao-Lou, TAN Xian-Xiang
2000, 14(3): 209-213 . doi: 10.11858/gywlxb.2000.03.009
PDF (570)
Abstract:
Ruby R-line under shock loading was studied using OMA (Optical Multi-channel Analyzer) on one-stage light gas gun. Time synchronism was in nanoseconds. The R-line shift was measured and pressure-shift relationship was determined.
Dynamic Mechanism of Mechanical Crystallization of Amorphous FeMoSiB Alloy
LIU Shu-E, YAO Bin, GUO Xing-Yuan, LIU Li, SU Wen-Hui
2000, 14(3): 214-218 . doi: 10.11858/gywlxb.2000.03.010
PDF (663)
Abstract:
Crystallization processes and mechanism of amorphous (Fe0.99Mo0.01)78Si9B13 (FMSB) alloy induced by mechanical milling were studied. We suggested that local high pressure has influence on mechanical crystallization, and discussed the effect of local high pressure on amorphous crystallization. It was...
Synthesis of Bulk Samples of Nanorystalline Tungsten
ZHOU Yu-Song, WU Xi-Jun, LI Bing-Han, XU Guo-Liang
2000, 14(3): 219-223 . doi: 10.11858/gywlxb.2000.03.011
PDF (683)
Abstract:
The bulk nanocrystalline samples of the refractory metal tungsten (nano-W), with -phase tungsten and an average grain size of 34 nm, were synthesized using vacuum hot pressing technique under the pressure of 1 GPa and temperature of 570 ℃. The dimensions, density and microhardness of the nano-W are ...
Shock Compression of a Kind of Porous Iron
LI Xi-Jun, ZHOU Xian-Ming, WANG Fan-Hou, JING Fu-Qian, SHI Shang-Chun, DONG Shi, HUANG Yue, CHEN Xin-He
2000, 14(3): 224-228 . doi: 10.11858/gywlxb.2000.03.012
PDF (619)
Abstract:
Shock wave velocities in porous iron with initial average density 6.904 g/cm3 were measured using electric pin method in the pressure range of 80 to 160 GPa. The experimental results indicate that the dynamic compressive properties of this porous iron can be described using a linear relation between...
An Exact Solution for Couette Shear Flow
HAN De-Cai, ZHOU Tie-Nong, PAN Yong-Ge
2000, 14(3): 229-234 . doi: 10.11858/gywlxb.2000.03.013
PDF (772)
Abstract:
An exact solution of velocity distribution for Couette shear flow in a non circular conduit with axial symmetry section is obtained in this paper. From the solution, velocity and flow rate for the rectangular section conduit with finite width are obtained, and it is concluded that Couette shear flow...
The Crack Growth Process of Particulate Filled Polymer Monitored by Acoustic Emission
ZHAO Fang-Fang, LUO Jing-Run, TIAN Chang-Jin, JIN Zhou-Geng, HE Ying-Bo
2000, 14(3): 235-240 . doi: 10.11858/gywlxb.2000.03.014
PDF (827)
Abstract:
In this paper, acoustic emission technology was used to monitor the crack initiation and propagation of single edge notched specimen of particulate filled polymer under three-point-bending condition. In the experiments, the initiation and propagation of crack tip were distinctly distinguished, and t...

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