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Ultrasonic Device Would Open Pipe BombsPiezoelectric ultrasonic transducer, energized by frequency generator and power supply, vibrates shell of pipe bomb while hardly disturbing explosive inner material. Frequency-control circuitry senses resonance in shell and holds generator at that frequency to induce fatigue cracking in threads of end cap. In addition to disarming bombs, ultrasonically induced fatigue may have other applications. In manufacturing, replaces some machining and cutting operations. In repair of equipment, cleanly and quickly disassembles corroded parts. In demolition of buildings used to dismember steel framework safely and controllably.
Document ID
19910000480
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Tech Brief
Authors
El-Raheb, Michael S.
(Caltech)
Adams, Marc A.
(Caltech)
Zwissler, James G.
(Caltech)
Date Acquired
August 14, 2013
Publication Date
September 1, 1991
Publication Information
Publication: NASA Tech Briefs
Volume: 15
Issue: 9
ISSN: 0145-319X
Subject Category
Fabrication Technology
Report/Patent Number
NPO-17951
Accession Number
91B10480
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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