From The Chemistry of Explosives, Second Edition


When an explosive is initiated either to burning or detonation, its energy is released in the form of heat. The liberation of heat under adiabatic conditions is called the heat of explosion, denoted by the letter Q. The heat of explosion provides information about the work capacity of the explosive, where the effective propellants and secondary explosives generally have high values of Q. For propellants burning in the chamber of a gun, and secondary explosives in detonating devices, the heat of explosion is conventionally expressed in terms of constant volume conditions Q v. For rocket propellants burning in the combustion chamber of a rocket motor under conditions of free expansion to the atmosphere, it is conventional to employ constant pressure conditions. In this case, the heat of explosion is expressed as Q p.

Consider an explosive which is initiated by a stimulus of negligible thermal proportions. The explosion can be represented by the irreversible process as shown in Figure 5.2, where Q is the value of the heat ultimately lost to the surroundings.

Figure 5.2: Schematic diagram of the irreversible explosion process

Under constant volume conditions Q v can be calculated from the standard internal energies of formation for the products ? U ? f (products) and the standard internal energies of formation for the explosive components ? U ? f (explosive components) as shown in Equation 5.4.

A similar expression is given for the heat of explosion under...

Copyright The Royal Society of Chemistry 2004 under license agreement with Books24x7

Products & Services
Forging Services
In the forging process, metal is shaped by pressing, pounding, or squeezing under very high pressure, to form parts called forgings.  Forging processes include cold forging or heading, impression or closed die, open die, and seamless rolled ring.
Forging Machines (hot forming)
Forging machines (hot forming) use compressive force and a high workpiece temperature to shape metal by plastic deformation.  A type of hot forming, hot forging involves the plastic deformation of a metal at a temperature and strain rate where recrystallization and deformation occur simultaneously. This prevents strain hardening, which can reduce ductility and contribute to brittle failure and structural fatigue.
Specialty Metal Shapes and Stock
Specialty metal shapes and stock consists of metals and alloys with an unlisted, specialized or proprietary shape or stock form.
Micro Machining Services
Micro machining services perform precision machining on small parts to integrate detail.

Topics of Interest

VOLUME OF GASEOUS PRODUCTS OF EXPLOSION The volume of gas produced during an explosion will provide information on the amount of work done by the explosive. In order to measure the volume of gas...

What is forging? Why use forgings and where are they used? Who buys forgings How big is the forging industry? How many people are employed by the forging industry? What metals are forged? What...

There are basically three methods (or processes) to make a forged part. Impression Die Forging Cold Forging Open Die Forging Seamless Rolled Ring Forging...

Overview Within the name of forging, a lot of different processes are referred to, so that a classification must be endeavored. As for other metal-forming processes, the deformation temperature can...

All Metals & Forge (AM&F) is a supplier of titanium alloys to industries around the globe. Through its open die forging facilities, AM&F supplies titanium flat bars and blocks with maximum widths of...