ملائی, احمد
تحقیقات و جهاد خودکفائی نزسا
[ 1 ] - پارامترهای تجزیه حرارتی ماده منفجره پلاستیکی PBXN-111
PBXN-111 is a cast cured underwater explosive containing RDX, ammonium perchlorate, aluminium powder and HTPB binder. In this research, the kinetics and thermodynamic properties of thermal decomposition of this PBX investigated by Kissinger and Flynn-Wall-Ozawa (FWO) methods based on differential scanning calorimetry under non-isothermal condition with heating rate of 5, 10, 15 and 20 °C/mi...
[ 2 ] - اثر نرم‌کننده‌های مختلف بر خواص ماده منفجره زیرآبی PBXN-111
PBXN-111 is a common plastic bonded explosive has been widely used in warhead section of several navy weapons. This charge is based on HTPB resin and prepared with cast-cure method. Isodecyl pelargonate (IDP) as plasticizer is used in PBXN-111 formulation. Considering limitations to prepare IDP, in this research the effect of replacement of dioctyl adipate (DOA) and dioctyl sebacate (DOS) inste...
[ 3 ] - مطالعه تجربی اثر پودر آلومینیوم نانو ساختار بر خواص یک PBX پایه HMX
Aluminum powder is a common ingredient in energetic materials. Reactivity of this metal can be improved by reducing the particle size, due to their larger surface/volume ratio. In this research, the effects of using nano-structured aluminum powder investigated on physical, thermal, mechanical and explosive characteristics of an HMX-based PBX. The results indicated that the experimental density ...
[ 4 ] - اثر پودر آلومینیوم بر قابلیت نفوذ یک نمونه خرج گود خاص
Shaped charges defeat armours by means of high velocity jets formed by the collapse of a metallic liner as a result of the detonation of an explosive. The explosive formulation is an important factor influencing the properties of a shaped charge. Explosive charges used in penetrating devices have usually high detonation velocity and high density. In this research, composition based on HTPB havi...
[ 5 ] - مقایسه عملکرد اکتول و PBXN-110 در یک سرجنگی خرج گود
The jet formation caused by the collapse of a liner is dependent mainly upon the explosive characteristics loaded in shaped charge warhead. In this study, the purpose was to compare the influence of Octol and PBXN-110 fillers on performance of a specific shaped charge warhead. This material loaded into the aluminum-cased shaped charge having a 35° copper liner and 510 cm3 in capacity. Results ...
[ 6 ] - بررسی خواص مکانیکی و عملکردی خرج ترموباریک PBXIH-135
Thermobaric charge PBXIH-135 is an explosive with desirable mechanical and safety characteristics. In present research, this PBX charge is provided on scale of 2 kg and its physical, mechanical, sensitivity and performance parameters were investigated. Prepared sample has density of 1.64 g/cm3, hardness of 53 Shore A, tensional strength of 1.68 MPa and strain of 44%. Impact and friction sensiti...
[ 7 ] - جایگزینی بایندر پرانرژی ماده منفجره زیرآبی PBXN-103 با پلی‌گلیسیدیل نیترات
Plastic bonded explosive PBXN-103 as an underwater charge based on energetic binder system uses in warhead section of several navy weapons. Metriol trinitrate (MTN), triethylene glycol dinitrate (TEGDN) and pelletized nitrocellulose are basic ingredients of binder system in PBXN-103 formulation. In this research the effects of applying accessible Poly glycidyl nitrate (PGN) as binder, were inv...
[ 8 ] - سنتز نانو ذرات میله‌ای α- اکسید آهن به روش هم‌رسوبی جدید: بکارگیری در آتشزای ترمیتی
Hematite iron oxide (α-Fe2O3) is used in military industries as a main component of thermite mixtures, burning rate catalyst of composite propellants and pyrotechnic igniter systems. Catalytic and oxidation activity of this mineral combination increases strongly with reduction of particle size. In this research, nanoparticles of hematite iron oxide was synthesized by a new co-precipitation meth...
[ 9 ] - اثر کاتالیزور پخت DBTDL بر خواص مکانیکی و بالستیکی یک آتشزنه کامپوزیتی
آتشزنه‌ها بخش مهمی از موتور هستند که سبب آغازش اشتعال گرین پیشرانه می‌شوند. در موتورهای بزرگ معمولاً از آتشزنه‌های کامپوزیتی تحت عنوان پایروژن استفاده می‌شود. آتشزنه‌های پایروژنی، فرمولاسیونی مشابه با پیشرانه‌های جامد مرکّب دارند و نرخ سوزش آنها نسبتاً بالا است. در این تحقیق یک نمونه آتشزنه‌ی کامپوزیتی بر پایه‌ی رزین پلی‌بوتادی‌اِن با انتهای هیدروکسی به‌روش ریخته‌گری- پخت تهیه شده و در آن، اثر افزا...
[ 10 ] - اثر مقدار دی‌مریل دی‌ایزوسیانات بر رفتاررئولوژیکی و خواص مکانیکی یک پیشرانه جامد مرکب بر پایه HTPB
Several parameters affecting the rheological and mechanical properties of solid composite propellants. Among them, the molar ratio of isocyanate (NCO) to hydroxyl (OH) groups (R value) is one of the important factors. In this research, the effects of changing in the weight ratio of dimeryl diisocyanate (DDI) curing agent related to hydroxyl terminated polybutadiene investigated on different pr...
[ 11 ] - بهینه‌سازی رئولوژیکی یک نمونه پیشرانه جامد مرکب با افزایش مالئیک انیدرید
Viscosity is one of the important parameters in design and production of composite solid propellants. Propellants with low end of mix (EoM) viscosity and longer pot-life have suitable condition for casting process. Several factors control the rheology behavior of propellants. In some cases, it may be necessary to apply some additives in order to optimize the rheology of the formulation. In this...
[ 12 ] - اثر نانو ذرات میله‌ای‌شکل اکسید آهن هماتیت بر خواص یک پیشرانه جامد مرکب
Iron oxide as a burning rate catalyst commonly used in many of solid composite propellants. As the particle size of this component decreased, the final properties of the propellant change. In this research, effects of using 1 percent by weight of nano hematite iron oxide (α-Fe2O3) investigated on properties of an HTPB/AP/Al formulation and compared with the same propellant containing micronized...
[ 13 ] - تأثیرات مقدار نانو اکسید تیتانیوم (IV) زیر میکرون بر خواص پیشرانه HTPB/AP/Al
Titanium (IV) oxide as a burning rate catalyst is commonly used in some of the solid composite propellants. As the particle size of this component decreases, the final properties of the propellant will be changed. In this research, effects of using submicron titanium oxide, up to 0.5 percent by weight, have been investigated on properties of an HTPB/AP/Al propellant. TiO2 powder has relatively ...
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