NDLI: Crack tip behavior under pulsed electromagnetic loading

Content Provider	IEEE Xplore Digital Library
Author	Satapathy, S. Stefani, F. Saenz, A.
Copyright Year	2004
Description	Author affiliation: Inst. for Adv. Technol., Univ. of Texas, Austin, TX, USA (Satapathy, S.; Stefani, F.; Saenz, A.)
Abstract	This paper describes a series of experiments and their numerical simulations in which cracks were created in conductors by using high-transient magnetic fields. The tests were conducted on small samples of 7075 aluminum alloy in a test fixture that placed the samples in series with a high-voltage capacitor bank and constrained the samples from moving. Notches were machined in the samples at various depths for the purpose of creating an initiation site for the cracks. After each pulse, the samples were unmounted and examined under an optical microscope. The peak current was varied to examine its effect on crack tip behavior. It was found that the crack tip extended linearly, was blunted by cavitation (blowholes formed due to high heating), or bifurcated-depending on the level of the peak current. Multiple pulses were also applied to one sample to study the effects of repeated pulsing on crack extension. Finite element computations were performed using the 3D Finite element analysis program EMAP3D in conjunction with the stress code DYNA3D. The computational results confirm most of the features observed in the experiments.
Starting Page	106
Ending Page	110
File Size	1254300
Page Count	5
File Format	PDF
ISBN	0780382900
DOI	10.1109/ELT.2004.1398056
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-05-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical microscopy Fixtures Numerical simulation Conductors Aluminum alloys EMP radiation effects Finite element methods Magnetic fields Testing Optical pulses
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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