On the problem of source identification from far-field observations in hysteretic materials
- Los Alamos National Laboratory, Los Alamos, New Mexico (United States) 87545
Propagation resulting from finite pulselength stresses applied at one end of a hysteretic material is analyzed using a propagation model containing a double modulus, or two-signal-speed, approximation of the stress-strain relation. The local signal speed is determined at any instant by both the value of stress and the sign of its time derivative (i.e., time-local history). It is shown that far-field waveforms do not determine unique source profiles. The propagation mechanism responsible for the ambiguity in source identification is common to broad classes of both local and global hysteretic stress-strain operators. Consequently, one may expect that it is typical of hysteretic materials that remote sources are not uniquely determined by observed waveforms. {copyright} {ital 1998 Acoustical Society of America.}
- OSTI ID:
- 610745
- Journal Information:
- Journal of the Acoustical Society of America, Journal Name: Journal of the Acoustical Society of America Journal Issue: 6 Vol. 103; ISSN 0001-4966; ISSN JASMAN
- Country of Publication:
- United States
- Language:
- English
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