File:Acoustic emission from spectrum fatigue cracks in 7075 aluminum (IA acousticemission1094527673).pdf
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[edit]Acoustic emission from spectrum fatigue cracks in 7075 aluminum
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| Author |
Smith, Wallace Dean, Jr. |
| Title |
Acoustic emission from spectrum fatigue cracks in 7075 aluminum |
| Description |
The E-2C Hawkeye, a U.S. Navy aircraft, has experienced problems with fatigue cracks in its wings. This problem was studied in the laboratory using a representative specimen under simulated flight loading. Acoustic emission monitoring was used to detect the stress pulses emitted during cracking. A new wave analysis technique was applied in order to distinguish extraneous noise from crack growth. This technique distinguishes between the extensional and flexural waves in thin aluminum plates. Extensional waves were found to correlate experimentally with waves from crack growth, while noise sources show different waveforms with lower frequencies. It was shown that acoustic emission provided early (crack length less than 0.01 inch) detection of fatigue cracking. This show promise for use in monitoring aircraft fatigue life. Subjects: Engineering; Science; Aluminum; Fatigue.; aircraft fatigue; aging aircraft; crack growth; 7075 alumiunum; spectrum loading; acoustic emission; plate waves |
| Language | English |
| Publication date | December 1990 |
| Current location |
IA Collections: navalpostgraduateschoollibrary; fedlink |
| Accession number |
acousticemission1094527673 |
| Source | |
| Permission (Reusing this file) |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. As such, it is in the public domain, and under the provisions of Title 17, United States Code, Section 105, may not be copyrighted. |
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This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 06:52, 8 July 2020 |  | 1,275 × 1,650, 78 pages (2.57 MB) | Fæ (talk | contribs) | FEDLINK - United States Federal Collection acousticemission1094527673 (User talk:Fæ/IA books#Fork8) (batch 1990-1992 #2820) |
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