Naval Postgraduate School
Dudley Knox Library
NPS Dudley Knox Library
View Item 
  •   Calhoun Home
  • Theses and Dissertations
  • 1. Thesis and Dissertation Collection, all items
  • View Item
  •   Calhoun Home
  • Theses and Dissertations
  • 1. Thesis and Dissertation Collection, all items
  • View Item
  • How to search in Calhoun
  • My Accounts
  • Ask a Librarian
JavaScript is disabled for your browser. Some features of this site may not work without it.

Browse

All of CalhounCollectionsThis Collection

My Account

LoginRegister

Statistics

Most Popular ItemsStatistics by CountryMost Popular Authors

Real - time detection of fatigue cracks at multiple holes in 7075 aluminum using acoustic emission.

Thumbnail
Download
Iconrealtimedetectio00flat.pdf (4.437Mb)
Download Record
Download to EndNote/RefMan (RIS)
Download to BibTex
Author
Flatley, Thomas.
Date
1992-09
Advisor
Gorman, Michael R.
Second Reader
Lindsey, Gerald H.
Metadata
Show full item record
Abstract
In the E-2C Hawkeye's wing center section, stress fractures have been identified in the main beam web section. The cracks occurred in several web section attachment holes. Previous work, concerned with fatigue data, used a finite element code to design a specimen which modeled the actual section of the beam at one particular fastener hole near wing station 49. Acoustic emission testing was used to determine if crack initiation could be identified. In this work, acoustic emission techniques were applied to the monitoring of multiple cracks. The E-2C fatigue spectrum was used to load the specimens but fatigue testing was not an objective. Specimens were modified by drilling holes and attaching angles that represented the structural shapes used to attach the section to the wing skin. The original one-hole configuration and the new multiple hole specimen configuration were tested. The cap angles were found to create a great deal of noise containing frequency components below 400kHz. Special high pass filters were fabricated which eliminated most of this noise. It was shown that linear location could be used to discriminate between crack growth signals and the filtered noise signals.
URI
http://hdl.handle.net/10945/23759
Collections
  • 1. Thesis and Dissertation Collection, all items

Related items

Showing items related by title, author, creator and subject.

  • Thumbnail

    Acoustic emission from spectrum fatigue cracks in 7075 aluminum 

    Smith, Wallace Dean, Jr. (1990-12);
    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 ...
  • Thumbnail

    Investigation of strain distribution around fatigue cracks in aluminum sheets 

    Tucker, Edwin B. (Monterey, California: U.S. Naval Postgraduate School, 1965);
    A survey of developments in the field of crack propagation and an experimental investigation of the strain distribution around fatigue cracks in flat aluminum sheets was conducted by Lt. E. B. Tucker, USN, at the ...
  • Thumbnail

    Quasi-static tearing tests of metal plating 

    Woertz, Jeffrey C. (Jeffrey Collin), 1969- (2002-09);
    Great effort is being focused on making the next generation of naval combatant ships more resistant to the effects of close-aboard explosions. The examination of the deformation modes in blast-loaded metal plating suggests ...
NPS Dudley Knox LibraryDUDLEY KNOX LIBRARY
Feedback

411 Dyer Rd. Bldg. 339
Monterey, CA 93943
circdesk@nps.edu
(831) 656-2947
DSN 756-2947

    Federal Depository Library      


Start Your Research

Research Guides
Academic Writing
Ask a Librarian
Copyright at NPS
Graduate Writing Center
How to Cite
Library Liaisons
Research Tools
Thesis Processing Office

Find & Download

Databases List
Articles, Books & More
NPS Theses
NPS Faculty Publications: Calhoun
Journal Titles
Course Reserves

Use the Library

My Accounts
Request Article or Book
Borrow, Renew, Return
Tech Help
Remote Access
Workshops & Tours

For Faculty & Researchers
For International Students
For Alumni

Print, Copy, Scan, Fax
Rooms & Study Spaces
Floor Map
Computers & Software
Adapters, Lockers & More

Collections

NPS Archive: Calhoun
Restricted Resources
Special Collections & Archives
Federal Depository
Homeland Security Digital Library

About

Hours
Library Staff
About Us
Special Exhibits
Policies
Our Affiliates
Visit Us

NPS-Licensed Resources—Terms & Conditions
Copyright Notice

Naval Postgraduate School

Naval Postgraduate School
1 University Circle, Monterey, CA 93943
Driving Directions | Campus Map

This is an official U.S. Navy Website |  Please read our Privacy Policy Notice  |  FOIA |  Section 508 |  No FEAR Act |  Whistleblower Protection |  Copyright and Accessibility |  Contact Webmaster

Export search results

The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

A logged-in user can export up to 15000 items. If you're not logged in, you can export no more than 500 items.

To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.