摘要:

AbstractThe burning rate characteristics of HMX‐CMDB propellants were examined as a function of HMX concentration. In the region of low HMX concentration, below about 50%, the burning rate decreases with increasing the HMX concentration. However, in the region of high HMX concentration, above about 50%, the burning rate increases with increasing the HMX concentration. When the measured results are extrapolated to the 100% HMX concentration, it is recognized that the burning rate approaches the burning rate of an HMX single crystal. The burning rate analysis indicates that the effect of the addition of HMX particles within double‐base propellants on burning rate is determined by the reaction rates in the gas phase and in the condensed phase. The gas phase reaction rate in the fizz zone decreases monotonously as the HMX concentration increases. On the other hand, the heat of reaction at the burning surface increases as the HMX concentration increases. The experimental results indicate that the burning rate with low HMX concentration is mainly controlled by the gas phase reaction rate and the burning rate with high HMX concentration is mainly controlled by the condensed phase reaction r

ISSN:0721-3115    

DOI:10.1002/prep.19860110102

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

摘要:

AbstractThe usefulness of the Gurney formulas in application to one‐dimensional computer codes for shaped charge design has called for their extention to predict the asymptotic velocities of imploding cylinders. Two different approaches by Chou, Carleone, and Flis on 1981 and by Chanteret on 1983 have led to improvements which were shown to predict correctly two‐dimensional code simulations for unconfined charges. Both works did not lead however to simple formulas which retain the conveniency of the original Gurney formulas. In the work presented, closed form analytical solutions for both the cylindrical as well as the spherical geometries are derived. The solution for each geometry is presented in a way in which the symmetry between the inner liner and the confinement is easily recognized. The relation of each solution to the Gurney formula for asymmetrical sandwich is also obvious. The presented solutions reduce to all the known Gurney formulas for the more simple geometries at the appropriate limits. The accuracy of the predictions by the obtained formulas is limited however when the assumptions of the Gurney model do not describe the real physical situation closely. This happens in general in extreme cases, e.g. when the liners are very light comparing to the explosive mass or when the ratio between the confinement radius and the inner liner radius is very large comparing to un

ISSN:0721-3115    

DOI:10.1002/prep.19860110103

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

摘要:

AbstractThe thermal analysis technique was used to rapidly evaluate the compatibility of explosives with contacted materials. The three kinetic parameters viz. activation energy E, reaction order n and pre‐exponential factor A were calculated from three characteristic temperatures of a single DTA curve. The compatibility was evaluated from the four parameters E, n and the characteristic temperatures Tm(peak maximum) and To(decomposition starting point on the DTA curve). The results are compared to those obtained from the gasometric metho

ISSN:0721-3115    

DOI:10.1002/prep.19860110104

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

摘要:

AbstractEquation of motion of an incompressible metal plate, accelerated by a plane detonation wave, has been solved for a general value of adiabatic exponent ß of detonation products to investigate its effect on terminal velocity of the plate. It has been found that the plate velocity increases with decreasing value of ß. The magnitude of this effect has been found sufficient to determine adiabatic exponent of detonation products from the measurement of flyer plate velocities at different C/M ratios.Velocities of metal plates, hurled by contact explosion of high density explosives, have also been measured with oscillographic technique by using an experimental setup which is insensitive to air shocks. The plate velocities measured by such an experimental setup have been found in good agreement with theoretical one

ISSN:0721-3115    

DOI:10.1002/prep.19860110105

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

摘要:

AbstractIn cylinder tests, the time progression of the radial deflection of metal tubes as a result of fume (detonation products) expansion are measured. The parameters of the relevant, analytical curves obtained can be determined via a fitting process, from which the expansion velocities of the cylinder wall are obtained through differentiation. In conjunction with conservation propositions for the gas flow in cylinders of varying cross‐sections, the course of an expansion process can be calculated iteratively. By taking the JWL curve representation as a basis, the parameters in this context may also be determined by fitting. In this way, the basis for calculation of all types of terminal ballistic data or a splinter picture of the cylinder wall can be given.In the tests, a total of 17 explosives were included with their initial data known from literature, in order to obtain in this way a comparison with those evaluation procedures for cylinder tests which have been in use up to presen

ISSN:0721-3115    

DOI:10.1002/prep.19860110106

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19860110107

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19860110108

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19860110101

出版商:WILEY‐VCH Verlag GmbH    

年代:1986

数据来源: WILEY