Experimental and numerical research on shock initiation of pentaerythritol tetranitrate by laser driven flyer plates

2004 ◽  
Vol 96 (1) ◽  
pp. 344-347 ◽  
Author(s):  
Gu Zhuowei ◽  
Sun Chengwei ◽  
Zhao Jianheng ◽  
Zhang Ning
Keyword(s):  
Pentaerythritol Tetranitrate ◽  
Shock Initiation ◽  
Numerical Research

Patterning PETN and HMX using Dip Pen Nanolithography

2005 ◽  
Vol 896 ◽  
Author(s):  
Omkar Nafday ◽  
Brandon Weeks ◽  
Jason Haaheim ◽  
Ray Eby
Keyword(s):  
Surface Energy ◽  
Scanning Probe Microscopy ◽  
Convenient Method ◽  
Energetic Materials ◽  
Scanning Probe ◽  
Pentaerythritol Tetranitrate ◽  
High Explosives ◽  
Shock Initiation ◽  
Effect Of Surface ◽  
Dip Pen Nanolithography

AbstractRecently there has been a focused effort to develop reliable nanoscopic writing and reading capabilities. Dip-pen nanolithography (DPN) has emerged as a convenient method to deliver nanoscale materials onto a substrate by leveraging scanning probe microscopy capability. A new application for the DPN method is the field of microdetonics which is the microscale decomposition and study of reactions of explosives. Results are presented for patterning pentaerythritol tetranitrate (PETN) and cyclotetramethylene tetranitramine (HMX) on silicon and mica substrates. The ultimate goal is to pattern both energetic materials in nanoscale registry and investigate their reaction and decomposition at the nanoscale due to heating or shock initiation. In addition to patterning of high explosives, a discussion on the effect of surface energy on patterning rates is investigated. This knowledge will be applicable to inks beyond high explosives.

Calculation And Experimental Substantiation Of Optimal Design Of The Welded Joint Of Plates On Соver Plates

2020 ◽  
pp. 17-24
Keyword(s):  
Welded Joint ◽  
Experimental Studies ◽  
Engineering Calculation ◽  
Tensile Tests ◽  
Physical Nonlinearity ◽  
Steel Plates ◽  
Optimal Parameters ◽  
Actual Problem ◽  
Numerical Research ◽  
Cover Plates

The article is devoted to the actual problem of assigning optimal parameters for connecting steel plates on cover plates with angular welds that are widely used in construction practice. The article presents the results of a comprehensive study of operation of a welded assembly of the plates connection on cover plates. An algorithm is proposed for determining the optimal parameters of a welded joint with fillet welds on the cover plates, which makes it possible to obtain a strength balanced connection. The results of full-scale tensile tests of models were presented. These results confirmed the correctness of the assumed design assumptions, and made it possible to obtain a form of destruction, not characteristic and not described in the normative literature, expressed by cutting the main elements along the length of the overlap in the joint. The possibility of such a form of destruction was confirmed by the results of numerical research in a nonlinear formulation. The optimal parameters of the nodal welded joint determined by engineering calculation are confirmed by experimental studies, as well as by the results of numerical experiments on models of calculation schemes, taking into account the physical nonlinearity of the material operation. The obtained dependence for determining the bearing capacity of the joint by the cut-off mechanism and the expression for limiting the overlap length of the cover plates will make it possible to predict the nature of the fracture and design equally strong joints.

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