Archive for May 2020

Development and Qualification Testing of Pyro-cartridge for Signal Cartridge Applications

Bhupesh A. Parate

Abstract: This research work describes the development and qualification aspects of a pyro-cartridge device for signalling cartridge applications in an emergency, as required by military aircraft. Rapid and effective burning of illuminating composition plays a crucial role in military applications. For initiation of illuminating cartridge, a pyro-cartridge is used. A pyro-cartridge consists of energetic materials (EM), such as lead styphnate, and releases the energy by rapid a chemical reaction process. It releases the energy instantaneously so that striker from pyro-cartridge can then initiate the signalling cartridge. This signalling cartridge provides pre-coded signals with four different colours (Red, Green, Yellow and White) fitted in the dispenser of an aircraft system. The most important part of this work is to develop a pyro-cartridge and qualify its testing to ignite the composition of signalling cartridges through various design qualification tests, such as drop test and sealing test. The functional tests of signal cartridges using pyro-cartridge at hot and cold temperature is observed successfully. The electrical parameters such as all fire current, no fire current, ignition delay, determination of energy and power of squib are also covered in this research article.

Keywords: All fire current; bridge wire; Bruceton staircase; cartridge; ignition delay; no fire current; pyro- qualification; signalling cartridge; squib; testing


Ref: JPyro 2020 (11-21)

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A Thermal Study of Mixtures of Micron-sized Copper (II) Oxide, Aluminum and Magnalium

Richard Harrison

Abstract: The reaction temperature in ignited samples of thermite compositions containing CuO and varying proportions of aluminum and magnalium was monitored at 1ms intervals by means of small embedded thermocouples. Analysis of the temperature profiles reveals that, in all cases, an exothermic minimum in the region of 950 K provides a significant contribution to the period from ignition to thermal runaway. The profiles were found to contain features that are attributable to both aluminum and magnesium (or magnalium) across the whole temperature range, indicating, in contrast to a commonly held belief about such mixtures, that the two metals were active participants at all stages of the reaction.


Ref: JPyro 2020 (1-10)

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ISEM 2021

The details of the upcoming international symposium on energetic materials, ISEM2021, in Tokyo, Japan, have just been published.