Correlations between parameters, and event energy spectra in acoustic-emission

In order to characterize phenomena of acoustic-emission, parameters such as peak amplitude, waveform integral, and ring-down count (or threshold crossing) were considered. As a result correlations between the three parameters are determined. Spectra of the acoustic-emission were analyzed by two methods : peak amplitude distribution and event energy spectra, for the purpose of differenciating the micromechanisms involved with the work-hardening of NaCl single crystal. It is found that event energy spectra are highly sensitive to the stages of deformation, releasing high-amplitude acoustic-emission as the deformation proceeds, and the more complex micromechanisms are associated with the transient stage. The energy of acoustic-emission estimated in conjuction with the dislocation energy. The calculation showed that in an acoustic-emission dislocation of 160 cm in length which amounts to about $4\times10^5$ dislocation loops proves to be engaged. In addition, a correction factor for two-sensor acoustic-emission monitoring system has been proposed.
Advisors
Cho, Byung-Ha조병하
Publisher
한국과학기술원
Issue Date
1981
Identifier
62915/325007 / 000791047
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 물리학과, 1981.2, [ iii, 46 p. ]

URI
http://hdl.handle.net/10203/47969
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=62915&flag=t
Appears in Collection
PH-Theses_Master(석사논문)
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