摘要:

AbstractEvidence is given of a fundamental difference between the response of bare explosive to the impact of a flat‐nosed rod, and the response to a sphere or round‐nosed rod. For relatively insensitive explosives such as Composition B, a spherical projectile, in contrast to a flat‐nosed rod, can have a range of impact velocities that produce a blast output which falls short of the output expected from a full detonation. It is postulated that this effect is caused by the divergent flow behind the initial impact shock created by the sphere. Without such divergence it is assumed that these impacts would produce full detonation. Consequently thc critical energy criterion for spherical impacts should be applied to the non‐reaction/reaction boundary and not the reaction/detonation boundary. This is shown to give constant values of critical energy for different sizes of sphere impacting the same explosive, and to give similar energy values to those obtained from impacts of flat‐n

ISSN:0721-3115    

DOI:10.1002/prep.19890140602

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY

摘要:

AbstractThermal explosion characteristics of lead(II) 2,4‐dinitroresorcinate in comparison with the parent compound 2,4‐dinitroresorcinol has been reinvestigated by mass Spectrometry using fast scan technique. For lead dinitroresorcinate, fragment ions spanned over m/z range 55–244 contrary to the reported range 2–74 by previous researchers. The decomposition pathways are predicted by analysing the fragmentation patterns. Lead, adduct ions and unusual ions were detected. The results are suggestive of the first step of the reaction to be a rupture of the Pb

ISSN:0721-3115    

DOI:10.1002/prep.19890140603

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY

摘要:

AbstractThe shock‐treatment permit to achieve high mechanical characteristics of steels. The interpretation of this effect is based on the possibility to change the carbon solubility in iron under these conditions. Measurements of the quality factors (internal friction in power−1) confirm this assumpt

ISSN:0721-3115    

DOI:10.1002/prep.19890140604

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY

摘要:

AbstractSeven amine salts of 3‐nitro‐1,2,4‐triazol‐5‐one(NTO) have been prepared from inexpensive raw materials. The ammonium, ethylenediamine. hydrazine, and guanidinium homolog salts of NTO were synthesized; their methods of preparation are described. Results from initial characterization and small‐scale sensitivity tests indicate that these compounds are thermally stable and moderately insensitive to impact. The heats of formation of these compounds were determined and their performances as gun‐propellant ingredients were calculated based on these data.13C‐NMR spectra ar

ISSN:0721-3115    

DOI:10.1002/prep.19890140605

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY

摘要:

AbstractA new optical recording technique for analyzing the initiation of high explosives under the impact of a shaped charge jet is described. This method permits determining, in “one single” test, the type of reaction – i.c. no reaction or reaction or detonation ‐ and the parameters build‐up distance Δs run‐up time Δt, initiation time tiand initiation distance Ziin the acceptor charge by observation of the acceptor charge side‐on and, via a mirror, also end‐on with simultaneous streak and

ISSN:0721-3115    

DOI:10.1002/prep.19890140606

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY

摘要:

AbstractA unique tracer evaluation facility has been put into operation at the Defence Research Establishment, Valcartier (DREV), in order to characterize tracer compositions loaded in 5.56 mm envelopes. The effect of rotational speeds up to 300,000 rpm on the performances of two tracer compositions and the standard Belgian L‐110 tracer was studied in this facility. The trace duration decreased substantially with any increase in spin speed. The luminous output was observed generally to be weak at low rotational speeds and to increase with any rise in spin over 150 krpm. The formation of a convex surface of combustion in the composition under spin and the degree of obstruction of the projectile mouth by the combustion residues are postulated to explain such behaviour

ISSN:0721-3115    

DOI:10.1002/prep.19890140607

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY

摘要:

AbstractThe physical and chemical characteristics of green signal pyrotechnic mix, before and after destabilization caused by the action of increased humidity at different temperatures, were determined. Data obtained by the means of X‐ray diffraction. IR spectroscopy and adiabatic calorimetry were compared with the results acquired by measuring functional characteristics (the dominant wavelength and the colour hue of the emitted light, the intensity of the emission and the rate of burning). Comparision of all of these results points out to the very close relationship between the X‐ray diffraction data and the function of the signal mix. Chemical changes, leading to the disuse of the examinated mix, were recognized as Mg(OH)2, BaCO3and Ba(NO2)2formation with concomittant decrease in Mg and Ba(NO3)2content. Since no changes were observed in separately aged components, the interaction among components proved to be of essential importa

ISSN:0721-3115    

DOI:10.1002/prep.19890140608

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY

摘要:

AbstractA new high performance liquid chromatography method has been developed for the analysis of ethyl centralite (EC) and its derivatives found in Australian gun propellants. The following derivatives were detected at>0.05% level: 2‐nitro EC, 4‐nitro EC. 2,4′‐dinitro EC, 4,4′‐dinitro EC,N‐ethyl‐N‐nitrosoaniline andN‐ethyl‐4‐nitro‐N‐nitrosoaniline. Several minor derivatives were also identified. The ratio of monoaromatic to urea products increased as a function of EC content and also with aging at 80°C.Paraderivatives were fa

ISSN:0721-3115    

DOI:10.1002/prep.19890140609

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19890140610

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19890140612

出版商:WILEY‐VCH Verlag GmbH    

年代:1989

数据来源: WILEY