摘要:

AbstractThe remarkable safety characteristics of the high explosive 1,3,5‐triamino‐2,4,6‐trinitrobenzene (TATB) are revolutionizing the design and deployment of nuclear weapons. Kel‐F 800 is used as the binder to obtain high‐density, mechanically stable billets of TATB that can be machined into desired shapes. However, repeated thermal cycling between − 54 °C and 74 °C of high density, pure, and plastic‐bonded TATB billets causes a permanent volume expansion (growth) of about 1.5 vol% to 2.0 vol%. Debonding of the Kel‐F 800 binder occurs during growth, causing a reduction in the mechanical properties of the plastic‐bonded explosive. The coefficient of thermal expansion (CTE) of these TATB billets between ambient temperature and 74 °C is 67.0 × 10−6/°C. TATB undergoes a secondary mechanical relaxation just above room temperature, coinciding with the onset of a high CTE, above the glass transition temperature (Tg) of Kel‐F 800. Thus, by judicious selection of a high‐Tgbinder, we have essentially eliminated growth, stopped the degradation of mechanical properties after thermal cycling, suppressed the secondary mechanical relaxation, and lowered the CTE to 50.0 × 10−6/°C betwe

ISSN:0721-3115    

DOI:10.1002/prep.19810060202

出版商:WILEY‐VCH Verlag GmbH    

年代:1981

数据来源: WILEY

摘要:

AbstractOne of the principal parameters associated with a solid propellant is its linear burning rate. Many attempts have been made in the past to determine theoretically the burning rates of solid propellants by the use of appropriate combustion models. The object of the present paper is to propose a simplified theory of burning rate suitable for composite solid propellants. While the paper follows basically the scheme suggested for this purpose by Beckstead, Derr and Price using multiple flamelets, certain simplifying assumptions have been introduced with a view to make the model easier to operate. An attempt is also made in the paper to extend it to the case of aluminized solid propellants as well on the basis of a specific hypothesis regarding the role of aluminium. The relevant transcendental equations of combustion were solved on a digital computer. The burning rates and related characteristics were evaluated by this technique for two specific ammonium perchlorate‐based solid propellants, one aluminized and the other non‐aluminized, and the results obtained agree reasonably with the reported experimental tre

ISSN:0721-3115    

DOI:10.1002/prep.19810060203

出版商:WILEY‐VCH Verlag GmbH    

年代:1981

数据来源: WILEY

摘要:

AbstractThere are many difficulties and dangers when carrying out underwater blasting in a rapid stream. The electromagnetic firing method is a special type of the remote control firing method and has a distinct advantage to the underwater blasting. The principle of this method is based on electromagnetic phenomena, the induced electromotive force by the coil which is set into the electromagnetic field is applied to fire the detonation cap.In this paper, the authors discuss the fundamental theory of the electromagnetic field caused by the exciting loop, and the effect of the conductive medium. As an example, they present the procedure and results of an actual underwater blasting work which is the first application of this technique.

ISSN:0721-3115    

DOI:10.1002/prep.19810060204

出版商:WILEY‐VCH Verlag GmbH    

年代:1981

数据来源: WILEY

摘要:

AbstractA portion of the binary phase diagram for the system ammonium nitrate‐potassium nitrate has been determined from − 55 °C to 185 °C. Results are presented for the ammonium‐nitrate‐rich end of the system up to 30 wt% potassiu

ISSN:0721-3115    

DOI:10.1002/prep.19810060205

出版商:WILEY‐VCH Verlag GmbH    

年代:1981

数据来源: WILEY

ISSN:0721-3115    

DOI:10.1002/prep.19810060201

出版商:WILEY‐VCH Verlag GmbH    

年代:1981

数据来源: WILEY