Ye Y.,Anhui University of Science and Technology |
Ye Y.,Henan Polytechnic University |
Ren H.,The Third Research Institute of Engineers of the General Staff |
Li Y.,Anhui University of Science and Technology |
And 2 more authors.
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2011
On the basis of the main factors affecting the test of ground shock induced by explosion, the empirical formulae of ground shock parameters are deduced by means of dimensional analysis. With the data of field tests in sandy clay, the attenuation curves of peak stress which is an important parameter of ground shock at different scaling depths of burst(SDOB) are drawn out. It can be concluded from the curves that the SDOB, ranging from -0.20 m/kg 1/3 to 1.00 m/kg 1/3, has great influence on peak stress of ground shock;and the tendencies of attenuation curves of peak stress at different SDOB are in concert. That is to say, the empirical formulae of peak stress at different SDOB have the same attenuation exponent;and the attenuation coefficient of empirical formulae will enlarge with the increasing SDOB. When the SDOB are close to 0.80 m/kg 1/3, the space between the attenuation curves of peak stress of ground shock is already very small, which indicates that SDOB have no obvious effect on the parameters of ground shock after it reaches 0.80 m/kg 1/3. When two explosions at different SDOB in one medium produce the same ground shock magnitudes in the same scaling distance, the relationship between the explosive charge with different depths in the yield of above two explosions is defined by "DOB coefficient of equivalent yield". According to the attenuation law of peak stress, the prediction method of ground shock parameters in free field at different SDOB in sandy clay has been given with DOB coefficient of equivalent yield, which provides the computing method of explosion load for the antiknock study and structure design during underground construction.
Wang T.-H.,CAS Institute of Mechanics |
Wang T.-H.,The Third Research Institute of Engineers of the General Staff |
Duan Z.-P.,CAS Institute of Mechanics |
Su J.-J.,Xi'an Modern Chemistry Research Institute |
Tian Q.-Z.,Xi'an Modern Chemistry Research Institute
Hanneng Cailiao/Chinese Journal of Energetic Materials | Year: 2013
The detonation performances of aluminized explosives are the typical non-ideal detonations. Because of the multiphase flowing and reacting at the front of detonation, it was difficult to obtain the detonation parameters by calculation. Assumed that the metal particles have no reaction at the front of detonation, and have the same pressure and velocity with the detonation products, using the continuum model and the general C-J relation, the full equations were obtained. Given the data of experimental detonation velocity, we can obtain the detonation pressure, particles velocity and the released heat at the front of detonation by solving the full equations. The calculations of two explosives with different aluminium content show that with the decrease of detonation velocity, the detonation pressure, mass velocity and explosion heat also deceased. When the explosives with different aluminium contents have the same detonation velocity, the higher the aluminium content, the larger the detonation pressure and the explosion heat. The calculation assumptions and the calculation model also given discussed.
Li S.-M.,The Third Research Institute of Engineers of The General Staff |
Li X.-J.,The Third Research Institute of Engineers of The General Staff |
Guo Y.-P.,The Third Research Institute of Engineers of The General Staff
Xitong Fangzhen Xuebao / Journal of System Simulation | Year: 2013
Various damage effects during projectile high-velocity impacting to target were described, such as cratering, extrusion, spalling, debris cloud, etc. The key techniques to numerically simulate the problem of projectile high-velocity impacting to target with AUTODYN code were proposed and analyzed, including basic algorithm, material strength model and failure model, material equation of state, artificial viscosity, hourglass control, element erosion, etc. Finally, the feasibility, validity and reliability of simulating damage effects during projectile high-velocity impacting to target with AUTODYN code were verified with different calculation examples.
Feng J.,The Third Research Institute of Engineers of the General Staff |
He Y.,The Third Research Institute of Engineers of the General Staff |
Li W.,The Third Research Institute of Engineers of the General Staff |
Lu X.,The Third Research Institute of Engineers of the General Staff
Tumu Gongcheng Xuebao/China Civil Engineering Journal | Year: 2011
The axial and lateral bearing capacity tests for drum-shaped steel wire rope shock isolators of YGG series have been carried out on a static test and measurement bed. Based on the experimental results, calculation formulae for axial static rigidity and lateral static rigidity of isolators subjected to constant axial forces or without axial forces have been fitted. The lateral rigidity of the isolator is closely related to the axial force on it. The initial loaded lateral rigidity increases with the axial force, and the secondary loaded lateral rigidity decreases with the increase of the axial force. The lateral loading curves intersect one another at about 2/3 of the allowable lateral dynamic displacement. The research shows that the axial rigidity of drum-shaped steel wire rope shock isolators of YGG series exhibits softening mode. High initial axial rigidity meets the need of peacetime use. The suitable rigidity softening coefficient of 0.34-0.43 ensures that the shock isolation system, which has high shock isolation ratio when subjected to explosive load, works stably and reliably in wartime.
Mu C.-M.,Anhui University of Science and Technology |
Mu C.-M.,Hunan University of Science and Technology |
Mu C.-M.,Key Laboratory of Mining Coal Safety and Efficiently Constructed by Anhui Province and Ministry of Education |
Ren H.-Q.,The Third Research Institute of Engineers of the General Staff |
Shi B.-M.,Anhui University of Science and Technology
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2016
In order to investigate the acceleration of concrete at different scaling depth of burst (SDOB), an empirical formula of impact acceleration was deduced by using the combination of free field experiment and dimensional analysis, together with inducting the concept of DOB coefficient of equivalent yield. The results show that when SDOB is form 0.25 m/kg1/3 to 1.0m/kg1/3, the peak of impact acceleration of C30 concrete at blasting point increases along with the increases of SDOB, but the attenuation of shock acceleration of concrete is almost in the same way at different SDOB. The peak of impact acceleration increases with the increase of concrete strength, and the attenuation of acceleration is also in concert for different concrete strength. The obtained empirical formula for C30 concrete is of high degree of accuracy for predicting the shock acceleration. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.