FENG Chang-gen , ZHANG Rui , CHEN Lang
Abstract:The Cook-off test of RDX explosive was carried out. The test results of explosives were discussed by the theoretics of thermal transfer. The thermal response of the explosive was calculated by numerical simulation methods and PHOENICS software was used in the simulation. The results show that RDX explosive decomposes slowly in the lower temperature (e.g. 205 ℃,230 ℃) and the heat of the reaction can be absorbed in time by the environment. Thus the thermal explosion is not occurred. And the calculation result has a good agreement with the experiment. When the test temperature is lower (e.g. 240 ℃),the temperature of the center of the column increases quickly. It will be ignited firstly. But in the higher temperature (e.g. 330 ℃), the higher temperature area is formed at the edge of the column. The temperatures of the area increase rapidly and lead to the thermal ignition and explosion.
PAN Bi-feng , LUO Yun-jun , TAN Hui-min
Abstract:A dendritic bonding agent (DBA) that can adhere to CL-20 effectly is reported. The adhesive properties are characterized by scanning electronic microscope (SEM) and X-ray photoelectron spectroscopy (XPS). DBA forms a layer of viscous film on the surface of CL-20; the adhesive degree measured by XPS analysis can be up to 22.87%, the adhesive degree increases by increasing of COOCH3 group content due to the inducing interaction between N and O.
LI Yu-feng , ZHANG Tong-lai , ZHANG Jian-guo
Abstract:The thermal decomposition process of potassium 4,6-dinitro-7-hydroxy-7-hydrobenzofuroxanate (KDNBF) is studied by using DSC, TG-DTG and FT-IR techniques. The results show that the solid residue at 230 ℃ are RCOOK, KNCO, RNO2 and KNO3, and at 306 ℃ are KNC, RCOOK and KNO3, respectively. The Arrhenius parameters of the decomposition reaction are calculated using Kissinger′s and Ozawa-Doyle′s method, indicating that the results obtained by the two methods agree well with each other and the Arrhenius equation of this reaction can be expressed by lnk = 45.2-192600/RT.
WANG Fang , LIU Jian-hong , TIAN De-yu , CHEN Li , ZHAO Feng-qi , HONG Wei-liang , LI Cui-hua , ZHANG Xue-li
Abstract:With the molecular structure describers,the enthalpy of formation for aromatic polynitro compounds are predicted by using an artificial neural network. The influence of neural network parameters and molecular structure describers(MSD) are studied. The correlation coefficient is excellent. The relative errors are almost not more than 10%.
CUI Qing-zhong , JIAO Qing-jie
Abstract:In this paper,the equilibrium states of combustion products and their thermodynamic parameters of different KNO3/S/charcoal compositions are calculated in least free-energy principle. Using reaction kinetics theory,the simulated results and the mechanism of combustion were analyzed qualitatively. Based on explosive temperature,powder force and products,low-polluted,low-eroded ingredients of black powder were designed. An optimized black powder was compared with normal black powder in combustion products and pressure histories.
HUANG Ming , CHEN Song-lin , JIANG Kai , MENG Li
Abstract:The coarse TATB was synthesized after continuous stirring a period of time at 155 ℃ when anhydrous-gaseous ammonia with 0.25 MPa was fed on the surface of toluene solution dissolved trichlorotrinitrobenzene(TCTNB) in a high-pressured rector. The influence factors including temperature,time,ammonia flux,TCTNB concentration and stirring rate ect. on TATB particle size and quality were investigated. The results show the factors affect products comprehensively. The toluene and TCTNB affect not only the purity of products but also the productivity,the particle size as well as the physical and chemical properties of TATB. The more pure toluene and TCTNB,the better quality,productivity and the color of TATB was. However,industrial class toluene could also be used to control the particle size and the content of chloride of TATB. The technical parameters of synthezing coarse TATB in lab at 100 g level were optimized.
ZHANG Chao-yang , SHU Yuan-jie , WANG Xin-feng , HUANG Yi-gang , DONG Hai-shan , LI jin-shan
Abstract:The structures and properties(geometrical optimization,molecular vibration,thermodynamics,activation of reaction and stability) of furazan and its radicals are studied theoretically by using DMol3. The calculated results show that there are weak conjugated effects on rings of furazan and its radicals,the N—O bonds are the weakest on rings; the order of molecular stability is furazan>single-radical>double-radical; the rings have a certain ability to accept electrons from H atoms which connect with them and become more stable consequently; the double-radical has some electrophilic,nucleophilic and radical ability,single-radical takes the second place and furazan is the most inertial; N atoms on all molecules probably have certain activations of reactions.
WU Hui-min , LU Fang-yun , LU Li , SONG Xian-cun
Abstract:Compressive behaviors of three energetic materials (CSP,PBX,Comp.B) are investigated experimentally by special designed split Hopkinson pressure bars (SHPB) and quasi-static behaviors by universal testing machine at different strain-rates (ranged from 10-4 s-1to 102 s-1) respectively. Nonlinear stress-strain curves at different strain rates are obtained and the results show that the mechanical behaviors of the three energetic materials bear obviously rate-dependent and the corresponding failure stress becomes higher with the strain rates rises but, the failure model of the three materials has its own character, i.e.,for Comp.B and PBX it shows brittle splitting and soften for CSP.
CAI Sheng , WEI Xiao-an , WANG Ze-shan
Abstract:A powdery low detonation velocity explosive containing single base propellants has been prepared and its technology has been studied. The mechanism of low detonation velocity for the explosive is discussed. Some factors, such as the grain size of single base propellants, the content of coating reagent and desensitizer, the density of the explosive, which may influence the performance of the explosive are also studied. The low temperature performance of explosives, the voluminal power, the mechanical sensitivity and the detonation velocity of explosives in different diameters are tested. The applied effect of the low detonation velocity explosives for oil field exploration is also analyzed. The results show that the low detonation velocity explosive has the properties of easy-preparing,high energy and high density,and it can greatly improve the resolution of the earth-shock prospecting.
DAI Xiao-gan , HAN Dun-xin , XIANG Yong , LI Tao
Abstract:Low speed Susan test was done to study the deformation of Susan projectile during impact. In the test a new test method was adopted,and the boundary of aluminum shell wrapped by the smog was measured by X-ray. Numerical calculation was applied and the model was given. The calculation results were compared with the test results. The pressure and strain of the explosive were analyzed primarily.
FAN Jing-hui , ZHANG Kai , WU Ju-ying , MA Yan
Abstract:The activities of different aluminium powder were studied by means of gasometric method. The results show that the activity of spherical nano-aluminium powder is 76.1%, and the activity of common flake aluminium powder is 43.0%. Particle sizes had significent effects on activity of aluminium powder. The shelf-life prediction of nano-aluminium was studied by accelerated test and Berthlot method. If the change values of nano-aluminium powder (10%,20% and 30%) as expiation standards, the shelf-lives of nano-aluminium powder are predicted (4.73a, 9.77a and 14.80a) at 25 ℃.
WEI Ai-yong , GUO Xue-bin , ZHANG Jie-tao
Abstract:The laser initiation test for several common explosive initiator compositions has been carried out. The results show the category type of explosives, the particle size and the thickness of the compositions can affect the absorption of laser and decide whether it can be initiated or not.
WANG De-run , SHEN Zhao-wu , ZHOU Ting-qing
Abstract:Experimental study on unconfined volume dispersion and single ignition of few dosage of mixed ternary fuel is successfully done, based on dispersed detonation. Experimental results show that single ignition process of mixed fuel containing aluminum powder, propylene oxide and TNT can be divided into four stages, overpressure within its explosion field firstly increases, then decays with increase of distance, and distribution of overpressure field is similar. Overpressure of binary mixed fuel containing aluminum powder and TNT decays like TNT charge with increase of distance, but its value is higher than TNT charge′s in the same mass at further distance. The continual action time of plus pressure during cloud detonation of mixed ternary fuel containing aluminum powder,propylene oxide and TNT reaches magnitude of 10 ms and is about 100 times than TNT charge′s.
SONG Pu , YU Jian-bin , LIANG An-ding , LI Bao-hua
Abstract:The damage experiments of simulation target′s vulnerability were made by using the real rod warhead to the charges covered steel shell. The damage effects of rod-fragments and shock wave overpressure were analyzed and the damage analysis was compared with the calculation of Jacobs criterion. It can′t detonate simulation target when pecific kinetic energy of 12 grams rod-fragments amount to 5.7 kJ·cm-2 and blastwave overpressure amounts to 4.67 MPa through analysis of experiments results. If the velocity of rod-fragements increases to 2.3 km·s-1,the fragments may detonate simulation target. The results show it is difficult to detonate the charges covered steel shell by rod fragments and shock wave, but they could damage the structure of the targets in appropriate conditions.
GAO Deng-pan , ZHENG Jia-gui , TIAN Yong , ZHANG Wei-bin
Abstract:The development of acoustic emission (AE) technique and its application in the field of researching energetic materials have been reviewed. From the research of AE features and the performance experimentation,the method and application of AE testing in the field of energetic materials have been analyzed and compared. The results show that AE testing,as a dynamic non-destructive testing technique,has unique reliability and advantages in the research of energetic materials,such as quality control,performance research,the monitor and evaluation of the inner damage,safety control during processing of energetic materials,etc.
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Editorial Board of Chinese Journal of Energetic Materials
Vol. , No.,
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