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81.
A.M. Reda 《Radiation measurements》2011,46(10):1187-1193
Shielding for a D–T sealed neutron generator has been designed using the MCNP5 Monte Carlo radiation transport code. The neutron generator will be used in field for the detection of explosives, landmines, drugs and other ‘threat’ materials. The optimization of the detection of buried objects was started by studying the signal-to-noise ratio for different geometric conditions. 相似文献
82.
The prediction of the penetration of three-dimensional (3D) shaped charge into steel plates is a challenging task. In this paper, the smoothed particle hydrodynamics (SPH) method is applied to simulate the jet formation generated by the shaped charge detonation and its damage to steel plates. The Jones–Wilkins–Lee (JWL) equation of state (EOS), Tillotson EOS, and elastic–perfectly plastic constitutive model were incorporated into SPH for the modeling of explosive detonation and dynamic behavior of metal material. The compute unified device architecture (CUDA) parallel programming interface has been employed in SPH to improve the computational efficiency of SPH. Firstly, the constitutive models and EOSs are validated by 3D TNT slab detonation and aluminum–aluminum (Al–Al) high velocity impact. Then the jet formation of the shaped charge detonation and its penetration into the steel plates are investigated using the graphics processing unit (GPU)-accelerated SPH methodology. The numerical results of these test cases are compared against the published experimental data or analytical result, which shows that the GPU-accelerated SPH methodology is capable of tackling the 3D shaped charge detonation and penetration involving millions of particles with high computational efficiency. 相似文献
83.
彭亚红 《数学年刊A辑(中文版)》2005,(2)
本文在经典摄动方法与椭圆型偏微分方程的估计理论的基础上引入了一种新的方法,对带一般非线性项的二阶椭圆型方程爆炸解的存在性进行了研究,得到了RN(N≥3)上具有C2有界区域Ω上爆炸解的存在性,进而得到全空间RN(N≥3)上爆炸解的存在性. 相似文献
84.
炸药爆温的光纤测温法测量 总被引:3,自引:0,他引:3
本文阐述了光纤测温技术依据的原理,给出了多通道瞬时光纤测温装置的构成。利用该装置对液体炸药硝基甲烷的实际爆轰温度及其光谱发射率进行了实验测量,结果分别为3700±100(K)和0.71±0.15。 相似文献
85.
本文采用一维不可压流体动力模型,考虑爆炸产物轴向飞散引起的稀疏波的影响,求解金属管在套管内的爆炸挤压运动,计算结果与实测相当一致,表明该模型在管挤压运动直至中期阶段是有效的。 相似文献
86.
87.
W.D. Liu K.X. Liu Q.Y. Chen J.T. Wang H.H. Yan X.J. Li 《Applied Surface Science》2009,255(23):9343-9347
Using an adjusted explosive welding technique, an aluminum plate has been coated by a Fe-based metallic glass foil in this work. Scanning electronic micrographs reveal a defect-free metallurgical bonding between the Fe-based metallic glass foil and the aluminum plate. Experimental evidence indicates that the Fe-based metallic glass foil almost retains its amorphous state and mechanical properties after the explosive welding process. Additionally, the detailed explosive welding process has been simulated by a self-developed hydro-code and the bonding mechanism has been investigated by numerical analysis. The successful welding between the Fe-based metallic glass foil and the aluminum plate provides a new way to obtain amorphous coating on general metal substrates. 相似文献
88.
The possible manifestations of thermodynamical instability (explosive vaporisation) are discussed for different regimes of laser heating of the metal/transparent liquid system. The present calculations show that the explosive vaporisation in the metastable region may occur if the nucleation rate is high enough. This condition is achievable if the surface tension of the superheated liquid tends to zero near the spinodal. It is also shown that the dependence of the phase explosion time on laser intensity markedly changes its behaviour when the water temperature reaches the spinodal. 相似文献
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