2015 Vol. 29, No. 2

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Ab Initio Molecular Dynamics Simulation of Energetic Materials
ZHENG Zhao-Yang, ZHAO Ji-Jun
2015, 29(2): 81-94. doi: 10.11858/gywlxb.2015.02.001
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Abstract:

Understanding the physical and chemical properties, detonation properties and decomposition mechanism is very important for molecular design, safety assessment and practical utilization of energetic materials.Ab initio molecular dynamics can be used to not only study the physical and chemical proper...

Raman Spectroscopy Studies of Nanocrystalline Lead Zirconate Titanate as Functions of High Pressure
YUAN Zhen, ZHANG Shao-Peng, JIN Chang-Qing, WANG Xiao-Hui
2015, 29(2): 95-98. doi: 10.11858/gywlxb.2015.02.002
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Abstract:

As one of the most important ferroelectric ceramic materials, PbZr0.52Ti0.48O3 (PZT) ceramic has been widely studied because of its extensive industrial application.We prepared the PZT ceramic using a simple water-based sol-gel method, and studied its Raman spectra as a function of high pressure.Ram...

Influence of Metal Additives on the Reaction Rate of High-Pressure and High-Temperature Experiments:Add Platinum Powder into the Coesite-Corundum-Kyanite System
LÜ Ming-Da, LIU Xi, XIONG Zhi-Hua, WANG Fei
2015, 29(2): 99-108. doi: 10.11858/gywlxb.2015.02.003
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Abstract:

In the high-pressure and high-temperature experiments with the diamond anvil cell and large volume press, metal powder (such as Pt, Au, Fe) is usually added for the purposes of pressure measurement, laser heating and mineral growth rate reduction.It is widely acknowledged that these metal additives ...

Loading Rate Effect on Crack Resistance Curves and Their Correlations
PAN Jian-Hua, CHEN Xue-Dong, JIANG Heng, WANG Xiu-Xi
2015, 29(2): 109-116. doi: 10.11858/gywlxb.2015.02.004
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Abstract:

Instrumented impact tests are carried out using precrack Charpy specimens of typical pressure vessel steel Q345R, the load-displacement curves are obtained.Based on the test data, the J-integral incremental equation procedure and Schindler method are used to estimate dynamic crack resistance curve o...

Statistical Study on Dynamic Fragmentation of Multiple Metal Rings
REN Guo-Wu, TANG Tie-Gang, GUO Zhao-Liang, LI Qing-Zhong
2015, 29(2): 117-122. doi: 10.11858/gywlxb.2015.02.005
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Abstract:

An experimental platform is built to investigate the dynamic fragmentation of multiple metal rings, the layout of multiple metal rings, initiation system and principle, are detailed.Then the platform is applied to conduct the dynamic loading of pure aluminium and oxygen-free electronic copper materi...

Parameters Optimization of the Strong Magnetic Field Generation Driven by Electromagnetic Force
DENG Ai-Dong, ZHANG Hua, YANG Xian-Jun
2015, 29(2): 123-128. doi: 10.11858/gywlxb.2015.02.006
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Abstract:

A zero-dimensional model is proposed to analyze the magnetic flux compression process of a thin cylindrical liner driven by electromagnetic force.The magnetic energy conversion efficiency and 3 optimal dimensionless parameters (h, A, Π) in the magnetic flux compression process are obtained by solvin...

Electronic Structure and Electrical Properties of Mg-Substituted ZnO Oxide
YU Xiao-Ying, LI Fan-Sheng, ZHANG Fei-Peng, FANG Hui, LU Qing-Mei, ZHANG Xin
2015, 29(2): 129-135. doi: 10.11858/gywlxb.2015.02.007
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Abstract:

The lattice structure, electronic sructure and electrical properies of the Mg doped ZnO have been systematically investigated by the ultro-soft pseudo-potentials based on the density functional theory calculations under the generallized gradient approximation.The calculational and analyzing results ...

Maximum Compression Ratios of Elemental Solids and Corresponding Thermodynamic Quantities on Shock Adiabat
DUAN Yao-Yong, GUO Yong-Hui, QIU Ai-Ci
2015, 29(2): 136-142. doi: 10.11858/gywlxb.2015.02.008
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Abstract:

A three-term equation of state for elemental solid materials is established, in which the cold energy and pressure are approximated by a fraction of the numerical solution of Thomas-Fermi theory at absolute zero-temperature, the thermal energy and pressure of ions are obtained from Cowan model, and ...

Modeling and Three-Dimension Numerical Simulation of Particle-Gas Mixing in Ejection with Spherical Sample Surface
LIU Kun, LI Lei, YUAN Shuai, BAI Jin-Song, LI Ping
2015, 29(2): 143-148. doi: 10.11858/gywlxb.2015.02.009
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Abstract:

A three-dimension numerical simulation subjected to gas-particle two phase flow method is implemented to simulate the particle-gas interaction in spherical ejection, in which particles are ejected from shocked sample interface.Particles initial distribution is modeled accroding to characteristics of...

Experimental Study on Minimum Ignition Energy of Diesel-Air Cloud
HUANG Yong, XIE Li-Feng, LU Chang-Bo, AN Gao-Jun, XIONG Chun-Hua, ZHU Ying-Zhong
2015, 29(2): 149-154. doi: 10.11858/gywlxb.2015.02.010
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Abstract:

In order to study the minimum ignition energy (MIE) of diesel, ignition experiments of -10# diesel were carried out in the shock tube under condition of spray and in the external field diesel tank.Results of the shock tube experiment show that the MIE of diesel cloud is approximate to a L-shaped cur...

Computational Design of Graded Density Impactors for Convergent Hypervelocity Launchers
WANG Yu, BAI Jin-Song, WANG Xiang, TAN Hua, LI Ping
2015, 29(2): 155-160. doi: 10.11858/gywlxb.2015.02.011
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Abstract:

When the convergent hypervelocity launcher is applied to measure the equation of states, the second stage flyer are required to have well impact planarity and high impact velocity. Taking this into consideration, our paralleled Eulerian code HVL-MFPPM is employed to investigate the hypervelocity lau...