scholarly journals Experimental study on fabrication and impact characteristics of PTFE/Al/W reactive materials with different molding pressures

2020 ◽  
Vol 1507 ◽  
pp. 062002
Author(s):  
B Geng ◽  
S He ◽  
H Guo ◽  
H Cun ◽  
H Wang ◽  
...  
Keyword(s):  
Experimental Study ◽  
Reactive Materials ◽  
Impact Characteristics

An experimental study of the deflagration-to-detonation transition in granular secondary explosives

1995 ◽  
Vol 448 (1934) ◽  
pp. 439-448 ◽  
Keyword(s):  
Experimental Study ◽  
High Speed ◽  
Maximum Density ◽  
Pentaerythritol Tetranitrate ◽  
Safe Storage ◽  
Reactive Materials ◽  
Deflagration To Detonation Transition ◽  
Detonation Transition ◽  
Secondary Explosive

The deflagration-to-detonation transition (DDT) has been studied in prepared columns of granular secondary explosive. The secondary explosives 2- (5-cyanotetrazolato) pentammine cobalt (III) perchlorate (CP) and pentaerythritol tetranitrate (PETN) were chosen for the study due to their known propensity to undergo DDT within a few millimetres of ignition. Confinement of CP columns within polycarbonate and PETN within metallic confinement fitted with slit windows allowed direct high-speed streak photography of the events. Deflagration and detonation velocities and the run-to-detonation lengths were measured as a function of charge pressed density. Ignition of the explosive column was attained thermally through a copper barrier with a gasless pyrotechnic. Deflagration and detonation velocities were seen to depend strongly upon pressed density with both explosives. There appeared to be a maximum density conducive to DDT with both explosives but no minimum with CP. Studies of DDT continue to have interest for the safe storage and use of reactive materials, and for the development of a detonator based on a secondary explosive.

Experimental Study on the Reaction Zone Distribution of Impact-Induced Reactive Materials

2017 ◽  
Vol 42 (8) ◽  
pp. 896-905 ◽  
Author(s):  
Shunshan Feng ◽  
Chenglong Wang ◽  
Guangyan Huang
Keyword(s):  
Experimental Study ◽  
Reaction Zone ◽  
Reactive Materials

Experimental study on discharge impact characteristics induced by piping failure of tailings dam

2021 ◽  
Vol 14 (19) ◽  
Author(s):  
Wu Shuaifeng ◽  
Cai Hong ◽  
Xiao Jianzhang ◽  
DU Jifang ◽  
Yan Jun ◽  
...  
Keyword(s):  
Experimental Study ◽  
Tailings Dam ◽  
Impact Characteristics

scholarly journals Experimental study on hypervelocity impact characteristics of density-grade thin-plate

2014 ◽  
Vol 63 (2) ◽  
pp. 024701
Author(s):  
Hou Ming-Qiang ◽  
Gong Zi-Zheng ◽  
Xu Kun-Bo ◽  
Zheng Jian-Dong ◽  
Cao Yan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Thin Plate ◽  
Hypervelocity Impact ◽  
Impact Characteristics

scholarly journals Experimental Study for the Impact Characteristics of Expanded EPP/EPS Foams

2013 ◽  
Vol 26 (6) ◽  
pp. 343-348 ◽  
Author(s):  
Han-Kook Kim ◽  
Byeoung-Jun Kim ◽  
Kwang-Young Jeong ◽  
Seong S. Cheon
Keyword(s):  
Experimental Study ◽  
Impact Characteristics ◽  
The Impact

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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