Relation of normal detonation parameters to the calorimetric heat of explosion of condensed explosives

1990 ◽  
Vol 26 (4) ◽  
pp. 483-485
Author(s):  
B. A. Sokolov ◽  
V. S. Trofimov
Keyword(s):  
Heat Of Explosion ◽  
Detonation Parameters ◽  
Condensed Explosives

Determination of the detonation parameters of condensed explosives

1965 ◽  
Vol 1 (3) ◽  
pp. 1-5 ◽  
Author(s):  
V. A. Veretennikov ◽  
A. N. Dremin ◽  
K. K. Shvedov
Keyword(s):  
Detonation Parameters ◽  
Condensed Explosives

scholarly journals EXPRESS METHOD FOR CALCULATING THE SPECIFIC HEAT OF EXPLOSIVE TRANSFORMATION OF CHNO CONDENSED EXPLOSIVES

2021 ◽  
pp. 259-268
Author(s):  
А.А. Трубников ◽  
В.В. Гордеев ◽  
А.Г. Вакутин
Keyword(s):  
High Energy ◽  
Oxygen Balance ◽  
Express Method ◽  
Detonation Products ◽  
Minimal Set ◽  
Maximum Heat ◽  
Heat Of Explosion ◽  
Decomposition Reactions ◽  
Comparison Results ◽  
Condensed Explosives

Разработан экспресс-метод расчета теплоты взрыва СаHbNcOdконденсированных взрывчатых веществ с различным кислородным балансом от резко отрицательного до положительного. Предложенный метод использует минимальный набор входных данных, состоящих из элементного состава, плотности энтальпий образований исходного взрывчатого вещества и его продуктов детонации. Расчет теплоты взрыва основывается на корреляционной связи между минимальной и максимальной теплотами взрыва с плотностью высокоэнергетического соединения. В статье подробно приведены реакции разложения взрывчатых веществ для случаев с минимальной и максимальными теплотами взрыва. Проведены расчеты теплоты взрыва по новому способу и методу Пепекина по представленной в статье базы взрывчатых веществ, а также приведены результаты сравнения, которые показали большую точность (в 2,3 раза) предложенного метода. An express method has been developed for calculating the explosion heat of cahbncod condensed explosives with different oxygen balance from sharply negative to positive. The proposed method uses a minimal set of input data consisting of the elemental composition, enthalpy density of the formations of the initial explosive and its detonation products. The calculation of the heat of explosion is based on the correlation between the minimum and maximum heat of explosion with the density of a high-energy compound. The article describes in detail the decomposition reactions of explosives for cases with minimum and maximum explosion heats. Calculations of the heat of explosion according to the new method and the pepekin method are carried out according to the explosives database presented in the article, and comparison results are also presented, which showed a better accuracy (2.3 times) of the proposed method.

Shock discontinuity zone effect: the main factor in the explosive decomposition detonation process

1992 ◽  
Vol 339 (1654) ◽  
pp. 355-364 ◽  
Keyword(s):  
Degrees Of Freedom ◽  
Thermal Ionization ◽  
Relaxation Processes ◽  
Explosive Decomposition ◽  
Time Duration ◽  
Active Particles ◽  
Condensed Explosives ◽  
Discontinuity Zone ◽  
Electronically Excited ◽  
Non Equilibrium

A new qualitative conception of the detonation mechanism in condensed explosives has been developed on the basis of experimental and numerical modelling data. According to the conception the mechanism consists of two stages: non-equilibrium and equilibrium. The mechanism regularities are explosive characteristics and they do not depend on explosive charge structure (particle size, nature of filler in the pores, explosive state, liquid or solid, and so on). The tremendous rate of loading inside the detonation wave shock discontinuity zone ( ca. 10 -13 s) is responsible for the origin of the non-equilibrium stage. For this reason, the kinetic part of the shock compression energy is initially absorbed only by the translational degrees of freedom of the explosive molecules. It involves the appearance of extremely high translational temperatures for the polyatomic molecules. In the course of the translational-vibrational relaxation processes (that is, during the first non-equilibrium stage of ca. 10 -10 s time duration) the most rapidly excited vibrational degrees of freedom can accumulate surplus energy, and the corresponding bonds decompose faster than behind the front at the equilibrium stage. In addition to this process, the explosive molecules become electronically excited and thermal ionization becomes possible inside the translational temperature overheat zone. The molecules thermal decomposition as well as their electronic excitation and thermal ionization result in some active particles (radicals, ions) being created. The active particles and excited molecules govern the explosive detonation decomposition process behind the shock front during the second equilibrium stage. The activation energy is usually low, so that during this stage the decomposition proceeds extremely rapidly. Therefore the experimentally observed dependence of the detonation decomposition time for condensed explosives is rather weak.

Titania Nanocrystalline Prepared by Detonation Method and Calculation of Detonation Parameters

2010 ◽  
Vol 36 (1) ◽  
pp. 75-79 ◽  
Author(s):  
Yandong Qu ◽  
Xiaojie Li ◽  
Zheng Zhao ◽  
Guilei Sun
Keyword(s):  
Detonation Parameters ◽  
Detonation Method

scholarly journals Predicting Heats of Explosion of Nitroaromatic Compounds through NBO Charges and 15N NMR Chemical Shifts of Nitro Groups

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Ricardo Infante-Castillo ◽  
Samuel P. Hernández-Rivera
Keyword(s):  
Cross Validation ◽  
Chemical Shifts ◽  
Quantitative Model ◽  
Nitroaromatic Compounds ◽  
Basis Set ◽  
15N Nmr ◽  
Prediction Ability ◽  
Heat Of Explosion ◽  
Nmr Chemical Shifts ◽  
Nbo Charges

This work presents a new quantitative model to predict the heat of explosion of nitroaromatic compounds using the natural bond orbital (NBO) charge and 15N NMR chemical shifts of the nitro groups (15NNitro) as structural parameters. The values of the heat of explosion predicted for 21 nitroaromatic compounds using the model described here were compared with experimental data. The prediction ability of the model was assessed by the leave-one-out cross-validation method. The cross-validation results show that the model is significant and stable and that the predicted accuracy is within 0.146 MJ kg−1, with an overall root mean squared error of prediction (RMSEP) below 0.183 MJ kg−1. Strong correlations were observed between the heat of explosion and the charges (R2 = 0.9533) and 15N NMR chemical shifts (R2 = 0.9531) of the studied compounds. In addition, the dependence of the heat of explosion on the presence of activating or deactivating groups of nitroaromatic explosives was analyzed. All calculations, including optimizations, NBO charges, and 15NNitro NMR chemical shifts analyses, were performed using density functional theory (DFT) and a 6-311+G(2d,p) basis set. Based on these results, this practical quantitative model can be used as a tool in the design and development of highly energetic materials (HEM) based on nitroaromatic compounds.

scholarly journals Experience in Detonation Nano-Structures Coating Application Technologies using Condensed Explosives and Gas Mixtures

2016 ◽  
Vol 9 (36) ◽  
Author(s):  
Sergei Yurievich Ganigin ◽  
Albert Rafisovich Gallyamov ◽  
Maxim Vladimirovich Nenashev ◽  
Andrey Yurievich Murzin ◽  
Uljanitsky Vladimir Jurevich
Keyword(s):  
Gas Mixtures ◽  
Coating Application ◽  
Nano Structures ◽  
Condensed Explosives
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