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A Stress-Wave Generator for Snow and Ice Studies

  • D. Bowles (a1) and R. L. Brown (a2)

Abstract

An electromagnetic stress-wave generator which was developed to study shock waves in snow and ice is described. This system works on the principle of generating large electrical currents to produce highly transient loads on the test specimen. In its present configuration, the generator can produce pressures ranging from a few kilopascals to as large as 104 kPa and load frequencies as, high as 150 kHz. The system has been found to have high repeatability and has good turn-round time.

Résumé

On décrit un générateur électrique d’ondes de contraintes mis au point pour étudier les ondes de choc dans la neige et la glace. Le systéme repose sur le principe de la création de forts courants électriques pour produire de fortes poussées passagéres sur l’échantillon de contrôle. Dans sa configuration présente, le générateur peut produire des pressions allant de quelques kPa jusqu’à 104 kPa à des fréquences atteignant 150 kHz. On a reconnu au systéme une forte répétitivité et une bonne durée de service.

Zusammenfassung

Es wird ein elektromagnetischer Druckwellen-Generator beschrieben, der zum Studium von Schockwellen in Schnee und Eis entwickelt wurde. Das System arbeitet nach dem Prinzip der Erzeugung grosser elektrischer Ströme zur Aufbringung hochtransienter Belastungen auf die Testprobe. In seiner gegenwärtigen Ausführung kann der Generator Drucke im Bereich von wenigen kPa bis zu 104 kPa und Luftfrequenzen bis zu 150 kHz erzeugen. Das System erwies seine hohe Reproduktionsfähigkeit und seine Eignung für Daucrbetrieb.

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Copyright

References

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Brown, R. L. 1980[a]. An analysis of non-steady plastic shock waves in snow. Journal of Glaciology, Vol. 25, No. 92, p. 27987.
Brown, R. L. 1980[b]. Pressure waves in snow. Journal of Glaciology, Vol. 25, No. 91, p. 99107.
Brown, R. L. 1980[c]. Propagation of stress waves in alpine snow. Journal of Glaciology, Vol. 26, No. 94, p. 23543.
Napadensky, H. 1964. Dynamic response of snow to high rates of loading. U.S. Cold Regions Research and Engineering Laboratory. Research Report 119.
Snell, R. F., and others. 1973. An electromagnetic, plane stress-wave generator, by Snell, R. F., Mackallor, D. C., and Guernsly, R.. Experimental Mechanics, Vol. 13, No. 11, p. 47279.
Wakahama, G., and Satō, A. 1977. Propagation of a plastic wave in snow. Journal of Glaciology, Vol. 19, No. 81, P. 17583.

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