摘要:

AbstractSince force is a parameter which is shape independent it is possible, and moreover advantageous, to use ground propellants for its experimental determination. These, due to their smaller grain size, give much shorter burning times than the unground propellants, which in turn reduces the pressure losses due to heat transfer to the containment vessel, and hence to a better agreement with theoretical values.By using different grain sizes one can extrapolate to the force values at zero grain size and hence for zero burning time. These values are only on average about 2% less than the thermodynamically calculated values. Without extrapolation, as the present results show, one can expect a difference between the theoretical and experimental values of about 5%.The conventional methods of determining force using closed vessels with volumes between 200 ml and 700 ml require a relatively large amount of sample material. The use of a ground powder allows the volume of the vessel to be reduced to 25 ml. This can be important when unknown foreign propellants have to be tested since these are usually only available in small quantities.

ISSN:0721-3115    

DOI:10.1002/prep.19760010302

出版商:WILEY‐VCH Verlag GmbH    

年代:1976

数据来源: WILEY

摘要:

AbstractIn order to characterize the small fall‐hammer of BAM (Bundesanstalt fur Materialprüfung) its mechanical properties were determined. Using the theory of the forces between two colliding bodies expressions were derived to describe the tester which were validated by the experimental measurements. I t was found that forces of up to 21 kN were transmitted to the anvil (for 1 kg weight dropping through 0,s m) and that the impact times ranged from about 150 f i s for the small weights to about 500 f i s for the large weights. It was also found that in addition to the expected kinetic energy dependence of the forces on the anvil there was also a dependence on the actual weight us

ISSN:0721-3115    

DOI:10.1002/prep.19760010303

出版商:WILEY‐VCH Verlag GmbH    

年代:1976

数据来源: WILEY

摘要:

AbstractIn order to find materials with increased specific electrical energy, especially for impact fuzes, the irreversible conversion of mechanical to electrical energy in ferroelectric ceramics of the Pb(Zr1‐xTix) O3type with a considerable proportion of zirconium is studied. The depolarization of the ceramics is measured for shock compressions between 0 and 30 kbar. The maximum electrical energy, obtained at about 18 kbar, is of the order of 1.8 J/cm3with Pb(Zr0.965Ti0.035)03+ 1% Nb2O5and of the order of 0.8 J/cm3with a Pb(Zr0.54Ti0.46)03+ 1% Nb205. As an example for application, the initiation of a 3.5 ω bridge wire PETN detonator is describ

ISSN:0721-3115    

DOI:10.1002/prep.19760010304

出版商:WILEY‐VCH Verlag GmbH    

年代:1976

数据来源: WILEY

摘要:

AbstractWhile stored at various temperatures between 65°C and 90°C, several double base propellants with the Same composition differing only in the stabilizer, were aged artificially to the onset of autocatalytic decomposition. A correlation between the temperature and the storage period has been established for the results obtained at the respective temperatures.Moreover, studies were carried out on the chromatographic analysis of stabilizer reaction products of the type occurring in particular in propellants with diphenylamine, 2‐nitrodiphenylamine, acardite I, acardite 11, and ethylcentralite as a result of storage at elevated temperatures due to reactions with the decomposition products of nitric acid esters.It has been shown that continuing aging of the propellant gives rise to stabilizer reaction products which are quite characteristic of the respective aging condition. These reaction products may be used as a criterion for different stages of aging within the shelflife of solid propella

ISSN:0721-3115    

DOI:10.1002/prep.19760010305

出版商:WILEY‐VCH Verlag GmbH    

年代:1976

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19760010306

出版商:WILEY‐VCH Verlag GmbH    

年代:1976

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19760010307

出版商:WILEY‐VCH Verlag GmbH    

年代:1976

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19760010308

出版商:WILEY‐VCH Verlag GmbH    

年代:1976

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19760010301

出版商:WILEY‐VCH Verlag GmbH    

年代:1976

数据来源: WILEY