An Analysis of the Initiation Process of Electro-explosive Devices

Faria, Paulo Cesar de Carvalho; Iha, Koshun; Rocco, José Atílio Fritz Fidel

doi:10.5028/jatm.2012.04015211

Abstract:

Electro-explosive devices (an electric resistance encapsulated by a primary explosive) fundamentally convert electrical energy into thermal energy, to start off an explosive chemical reaction. Obviously, the activation of those devices shall not happen by accident or, even worse, by intentional exogenous influence. From an ordinary differential equation, which describes the electro-explosive thermal behavior, a remarkable, but certainly not intuitive, dependence of the temperature response on the time constant of the heat transfer process is verified: the temperature profile dramatically changes as the time constant spans a wide range of values, from much lesser than the pulse width to much greater than the pulse period. Based on this dependence, important recommendations, concerning the efficient and safety operation of electro-explosive devices, are proposed.

Keywords:
Electro-Explosive Devices; Squib; Thermal Model; Pulsed Initiation; Temperature Stacking

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REFERENCES

Cochin, I., 1980, "Analysis and Design of Dynamic Systems" New York, Harper & Row, Publishers, pp. 211.
Haberman, C. M., 1965, "Engineering Systems Analysis", Ohio, C.E. Merrill Books, pp. 20-49.
Moran, M.J., Shapiro, H.N., 2008, "Fundamentals of. Engineering Thermodynamics", New York, John Wiley & Sons, pp. 131-132.
Potter, M. C., Scott, E. P., 2004, "Thermal Sciences: An Introduction to Thermodynamics, Fluid Mechanics, and Heat Transfer", Kentucky, Brooks & Cole, pp. 71-135.
Prince, W. C., Leeuw, M. W., 1988, "Analysis of the Functioning of the Bridge-wire Igniters Based on the Fitted Wire Model", Propellants, Explosives, Pyrotechnics, Vol. 13, No. 4, pp. 120-125.
Rosenthal, L. A., 1961, "Thermal Response of Bridge-wires Used in Electro-explosive Devices", Rev Sci Instrum, Vol. 32, No. 9, pp. 1033-1036.
Thompson, R. H., 1973, "Evaluation and Determination of Sensitivity and Electromagnetic Interactions of Commercial Blasting CAPS", USBM, Washington, D. C., Rep. no. F-C3102.
Wylie, C. R., 1975, "Advanced Engineering Mathematics", Tokyo, McGraw-Hill Kogakusha, 4th ed., pp. 295-302.

Publication Dates

Publication in this collection
Jan-Mar 2012

History

Received
04 Nov 2011
Accepted
23 Jan 2012

This is an Open Access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

[1] Cochin, I., 1980, "Analysis and Design of Dynamic Systems" New York, Harper & Row, Publishers, pp. 211.

[2] Haberman, C. M., 1965, "Engineering Systems Analysis", Ohio, C.E. Merrill Books, pp. 20-49.

[3] Moran, M.J., Shapiro, H.N., 2008, "Fundamentals of. Engineering Thermodynamics", New York, John Wiley & Sons, pp. 131-132.

[4] Potter, M. C., Scott, E. P., 2004, "Thermal Sciences: An Introduction to Thermodynamics, Fluid Mechanics, and Heat Transfer", Kentucky, Brooks & Cole, pp. 71-135.

[5] Prince, W. C., Leeuw, M. W., 1988, "Analysis of the Functioning of the Bridge-wire Igniters Based on the Fitted Wire Model", Propellants, Explosives, Pyrotechnics, Vol. 13, No. 4, pp. 120-125.

[6] Rosenthal, L. A., 1961, "Thermal Response of Bridge-wires Used in Electro-explosive Devices", Rev Sci Instrum, Vol. 32, No. 9, pp. 1033-1036.

[7] Thompson, R. H., 1973, "Evaluation and Determination of Sensitivity and Electromagnetic Interactions of Commercial Blasting CAPS", USBM, Washington, D. C., Rep. no. F-C3102.

[8] Wylie, C. R., 1975, "Advanced Engineering Mathematics", Tokyo, McGraw-Hill Kogakusha, 4th ed., pp. 295-302.

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