2016 Vol. 36, No. 4

Display Method:
Ballistic limit and damage properties of basalt/Kevlar stuffed shield
Jia Guzhai, Ha Yue, Pang Baojun, Guan Gongshun, Zu Shiming
2016, 36(4): 433-440. doi: 10.11883/1001-1455(2016)04-0433-08
Abstract:
In order to study the ballistic limits and damage properties of the basalt/Kevlar stuffed shields, hypervelocity impact tests were carried out by non-power two-stage light-gas gun facilities. The ballistic limit curves were fitted with the test data,...
Effects of initial pressure and gap width on detonation initiation distance in a narrow gap with millimeter-scale width
Zhang Penggang, Zhu Yuejin, Pan Zhenhua, Wang Qian
2016, 36(4): 441-448. doi: 10.11883/1001-1455(2016)04-0441-08
Abstract:
The detonation initiation distance for stoichiometric C2H4/O2 mixture gas in a narrow gap was experimentally studied at the initial pressure of 5.0-50.0 kPa. The channels were formed by the 10, 20, 30 mm×1.0 mm cross-sections and 1 220 mm long, respe...
Theoretical and numerical study on detonation wave Mach reflection in high explosive charge with waveshaper
Pan Jian, Zhang Xianfeng, He Yong, Deng Qibin
2016, 36(4): 449-456. doi: 10.11883/1001-1455(2016)04-0449-08
Abstract:
On the basis of the three-wave theory and Whitham's method, the flow fields associated with regular reflection and Mach reflection in high explosives with waveshapers were investigated, and the relevant theoretical model for deriving the detonation c...
Influence factors of gas explosion venting in linked vessels
Sun Wei, Wang Zhirong, Ma Longsheng, Liu Minghan, Yang Chenjian
2016, 36(4): 457-464. doi: 10.11883/1001-1455(2016)04-0457-08
Abstract:
A series of experiments were conducted to study the factors influencing gas explosion venting in methane-air mixture explosion in linked vessels. For the linked vessels, the maximum explosion venting pressure in both the big vessel and the small vess...
Experimental study on expansion characteristics of annular four wall combustion-gas jets in a liquid-filled cylindrical chamber
Hu Zhitao, Yu Yonggang
2016, 36(4): 465-471. doi: 10.11883/1001-1455(2016)04-0465-07
Abstract:
The combustion-gas generator and liquid-filled cylindrical chamber are designed to study the expansion characteristics of annular four wall combustion-gas jets under high temperature and high pressure in a confined space. The expansion processes of T...
A method for calculating critical spalling and perforating thicknesses of concrete slabs subjected to contact explosion
Yue Songlin, Wang Mingyang, Zhang Ning, Qiu Yanyu, Wang Derong
2016, 36(4): 472-482. doi: 10.11883/1001-1455(2016)04-0472-11
Abstract:
Tanking account of the mass conservation conditions, incompressible conditions and boundary conditions, this paper described the dynamic behaviors of the medium based on the plastic-rigid model and established the compatible dynamic velocity field in...
Experimental study for effects of strain rates and joint angles on dynamic responses of simulated rock materials
Li Xianglong, Wang Jianguo, Zhang Zhiyu, Huang Yonghui
2016, 36(4): 483-490. doi: 10.11883/1001-1455(2016)04-0483-08
Abstract:
By using a split Hopkinson pressure bar (SHPB) technique, impact experiments were carried out on the jointed rock specimens simulated by cement-based mortar specimens. The dynamic responses of the simulated jointed rock material with different joint ...
A shock-reload wave technique for dynamic strength study of materials at high pressure by self-consistent method
Yu Yuying, Tan Ye, Tan Hua, Dai Chengda, Peng Jianxiang, Li Xuemei, Wu Qiang, Wang Xiang
2016, 36(4): 491-496. doi: 10.11883/1001-1455(2016)04-0491-06
Abstract:
A convenient method for fabricating a layered impactor with a sample backed up by high hardness materials was developed to overcome the obstacle of the shock-reload experiments in the self-consistent yield strength technique. This method was validate...
Experimental research on explosion parameters of diethyl ether mist
Wang Yue, Bai Chunhua
2016, 36(4): 497-502. doi: 10.11883/1001-1455(2016)04-0497-06
Abstract:
The Mei extinction detection system and the self-developed 20 L pulse pneumatic spray multiphase explosion test system were applied to experimentally investigate the explosion parameters of the diethyl ether mist/air mixtures. By regulating pneumatic...
Application of genetic algorithm to calculation of detonation parameters
Xie Zhongyuan, Wang Xiaofeng, Wang Hao, Zhou Lin
2016, 36(4): 503-508. doi: 10.11883/1001-1455(2016)04-0503-06
Abstract:
To solve the problems of bad convergence and to satisfy the strict requirement to initial conditions in the calculation of detonation parameters, a new calculation method was proposed based on the principles of chemical equilibrium and the method of ...
Mixed uncertainty quantification and its application in upwind scheme for computational fluid dynamics (CFD)
Liang Xiao, Wang Ruili
2016, 36(4): 509-515.
Abstract:
Both aleatory uncertainty and epistemic uncertainty exist in the initial and boundary conditions when we numerically solve the CFD with sharp discontinuity. In this paper, mixed uncertainty quantification approaches are developed to deal with this si...
Numerical simulation on penetration of concrete target by shaped charge jet with SPH method
Qiang Hongfu, Fan Shujia, Chen Fuzhen, Liu Hu
2016, 36(4): 516-524. doi: 10.11883/1001-1455(2016)04-0516-09
Abstract:
On the basis of the smoothed particle hydrodynamics (SPH) method with fully variable smoothing lengths, the modified Ott-Schnetter SPH method was used to cope with the computational instability in the large density gradient problems. The Holmquist-Jo...
Experimental study for effects of water and its container on explosion loading near explosive
Xu Haibin, Zhong Fangping, Yang Jun, Zhang Dezhi, Qin Xuejun, Liu Junling, Shi Guokai, Liang Zhigang, Shen Zhaowu
2016, 36(4): 525-531. doi: 10.11883/1001-1455(2016)04-0525-07
Abstract:
To explore the mitigating mechanism of detonation of a high explosive surrounded by water, experiments of explosion with and without water were carried out in an open-ended steel cylinder. The particle velocity and the displacement of the outer surfa...
Lateral release effect in shock-loaded specimens during soft recovery process
Hu Qiushi, Zhao Feng, Li Kewu, Fu Hua, Song Zhenfei
2016, 36(4): 532-540. doi: 10.11883/1001-1455(2016)04-0532-09
Abstract:
Under shock loading a specimen undergoes a uniaxial-strain loading process and a lateral release process, both of which have an influence on the residual structure, while the influence of the latter is often underestimated or even totally neglected. ...
Effects of reflected wave on premixed-gas explosion and dynamic response of tube shells
Zhou Ning, Zhang Bingbing, Feng Lei, Geng Ying, Jiang Shuai, Zhang Lu
2016, 36(4): 541-547. doi: 10.11883/1001-1455(2016)04-0541-07
Abstract:
Experiments were carried out and the dynamic response test of the tube wall was conducted simultaneously to characterize the flame and pressure wave propagation generated by methane-air mixture explosion in a shock tube. Our results show that in the ...
Numerical analysis of dynamic response and impact resistance of a large-span rock shed in a tunnel under rockfall impact
Wang Shuang, Zhou Xiaojun, Jiang Bo, Zhou Yuefeng
2016, 36(4): 548-556. doi: 10.11883/1001-1455(2016)04-0548-09
Abstract:
In this work, based on the determination of the rockfall impact energy and using the dynamic finite element numerical method, we analyzed dynamic responses of large-span shed-tunnels of mountain tunnels under rockfall impact, and investigated the cha...
Porous propellant burning rate enhanced by plasma
Ni Yanjie, Xing Rongjun, Wan Gang, Jin Yong, Li Haiyuan, Yang Chunxia, Li Baoming
2016, 36(4): 562-567. doi: 10.11883/1001-1455(2016)04-0562-06
Abstract:
The experimental system with a closed bomb was employed to discuss the characteristics of 4/7 high-nitrogen solid propellant burning rate enhanced by plasma. The plasma energy transferred into the closed bomb was measured by the utilization efficienc...
Detonation wave structure of CL-20 composite explosive
Liu Danyang, Chen Lang, Wang Chen, Zhang Liansheng
2016, 36(4): 568-572. doi: 10.11883/1001-1455(2016)04-0568-05
Abstract:
The detonation reaction of CL-20 composite explosive was numerically simulated to analyze its detonation reaction characteristics, and then an experimental setup was designed for measuring the particle velocity at the explosive-window interface. The ...
Experimental study on explosion performance of thermobaric explosive
Huang Yafeng, Tian Xuan, Feng Bo, Wang Xiaofeng
2016, 36(4): 573-576. doi: 10.11883/1001-1455(2016)04-0573-04
Abstract:
In order to investigate the characteristics of the thermobaric explosives, the 25 g charge of thermobaric explosive was ignited in the sealed explosion chamber of 5.8 L volume, and the explosion pressure and temperature were measured and the gas prod...
Article
Mixed uncertainty quantification and its application in upwind scheme for computational fluid dynamics (CFD)
Liang Xiao, Wang Ruili
2016, 36(4): 509-515. doi: 10.11883/1001-1455(2016)04-0509-07
PDF (397)
Abstract:
Both aleatory uncertainty and epistemic uncertainty exist in the initial and boundary conditions when we numerically solve the CFD with sharp discontinuity. In this paper, mixed uncertainty quantification approaches are developed to deal with this si...
Precision test of velocity profile in collision region of plane metal flying layer
Zhang Chongyu, Hu Haibo, Wang Xiang
2016, 36(4): 557-561. doi: 10.11883/1001-1455(2016)04-0557-05
PDF (442)
Abstract:

Using the line array Doppler pins system(DPS) test technique, the velocity history of the collision region of a tungsten alloy plate was measured, and 16 test points were arranged within the 4-mm-long range in the collision region. The velocity curve...