NDLI: Acoustic emission characteristics of copper alloys under low-cycle fatigue conditions

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Acoustic emission characteristics of copper alloys under low-cycle fatigue conditions

Content Provider	NASA Technical Reports Server (NTRS)
Author	Kawamoto, A. Ono, K. Green, A. Krampfner, Y.
Copyright Year	1975
Description	The acoustic emission (AE) characteristics of pure copper, zirconium-copper, and several copper alloys were determined to develop nondestructive evaluation schemes of thrust chambers through AE techniques. The AE counts rms voltages, frequency spectrum, and amplitude distribution analysis evaluated AE behavior under fatigue loading conditions. The results were interpreted with the evaluation of wave forms, crack propagation characteristics, as well as scanning electron fractographs of fatigue-tested samples. AE signals at the beginning of a fatigue test were produced by a sample of annealed alloys. A sample of zirconium-containing alloys annealed repeatedly after each fatigue loading cycle showed numerous surface cracks during the subsequent fatigue cycle, emitting strong-burst AE signals. Amplitude distribution analysis exhibits responses that are characteristic of certain types of AE signals.
File Size	15992636
Page Count	132
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19750019065
Archival Resource Key	ark:/13960/t3kx05t4z
Language	English
Publisher Date	1975-04-01
Access Restriction	Open
Subject Keyword	Metallic Materials Fatigue Tests Nondestructive Tests Acoustic Measurement Copper Alloys Thrust Chambers Amplitude Distribution Analysis Frequency Ranges Load Tests Crack Propagation Zirconium Alloys Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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