نتایج جستجو برای: htpb
تعداد نتایج: 268 فیلتر نتایج به سال:
The success of the composite solid propellant motor depends on the proper stress-strain behavior of the propellant grain against tensile, compression and shear stresses and intensive changes in gravity during launch. In this paper, the effect of formulation components and other parameters affecting mechanical properties (tensile strength, elongation and elastic modulus), and their effects AP/Al...
Red phosphorus (RP) is one of the most important allotropes of phosphorus with extensive military and civil applications in pyrotechnics. During its maintenance, decomposition of RP generates phosphorus acid family and poisonous phosphine gas. One of the conventional method for evaluation of chemical stability of red phosphorus munitions is evolved phosphine measurement. In the present study, f...
BACKGROUND Q fever is a widespread zoonotic disease caused by Coxiella burnetii. Ticks may act as vectors, and many epidemiological studies aim to assess C. burnetii prevalence in ticks. Because ticks may also be infected with Coxiella-like bacteria, screening tools that differentiate between C. burnetii and Coxiella-like bacteria are essential. METHODS In this study, we screened tick specime...
Rheological Properties Such as Viscosity (η), Shear Stress (τ), and Torque (M) of the mixtures of (HTPB) with Octagon (HMX), Hexogen (RDX), and 2, 6 Diamino-4-Phenyl-1, 3, 5 Triazine (DAPTA) mixtures were measured. The experimental design was arranged for three factors at two levels (High and low levels). Temperature of the mixture (°C), Speed of the stirrer (rpm), Mixing Time (minutes) have be...
افزودن ترکیبات نیترامینی از جمله RDX و HMX به پیشرانه‌های جامد مرکب، علی‌رغم مزایای بسیار، به سرعت سوختن پایین و مقدار بالای نمای فشار (n) می‌انجامد. از این رو، تعیین کاتالیست مناسب برای بهبود سرعت سوختن پیشرانه‌های جامد مرکب حاوی نیترامین ضروری است. در این مقاله، تأثیر ریز و نانو کاتالیست‌ها بر پیشرانه جامد مرکب مبتنی بر پایه HTPB/AP/Al/RDX بررسی شده و کاتالیست‌های مناسب سرعت سوختن برای این نو...
In order to preserve structure and also achieve the desired thrust rocket motor, engine Case temperature should be prevented increase excess.This operation the can be done by Insulation. EPDM rubber because of advantages such as low specific weight, improve aging properties, as long as thermal insulation for solid propellant motors case bond Introduced and its properties are investigated in thi...
In most gas generator systems, production of gases at low temperature (less than 1000 °C) over a relatively long operation time (between 10 to 300 seconds) is needed. According to studies, composite propellant based on ammonium nitrate as oxidizer, especially AN/HTPB propellant is most commonly propellant used in gas generators. Because of low burning rate (about 2 mm/s at a pressure of 70 ...
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