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

Experimental investigation of failure in thin rings subjected to uniform external pressure

Thumbnail
Download
Iconexperimentalinve00demy.pdf (9.222Mb)
Download Record
Download to EndNote/RefMan (RIS)
Download to BibTex
Author
Demyttenaere, Jules Henry
Norris, William J.
Date
1954-05
Advisor
Evans, J.H.
Wenk, E.
Murray, W.W.
Metadata
Show full item record
Abstract
The object of this thesis was to investigate experimentally the strain distributions and ultimate failures in thin circular and non-circular aluminum rings subjected to uniform external pressure. A test apparatus was designed to permit the application of hydraulic pressure to the outer circumference of a ring, placed between two sheets of Plexiglas. The small clearance between the edges of the ring and the Plexiglas was sealed by a continuous rubber gasket of slightly greater width fitted around the outer circumference of the ring. Except for friction at the gasket -Plexiglas interface, the ring was free of restraint. Nine rings of aluminum alloy, 61S-T6, were tested to collapse; the variable in this series was out -of -roundness. Correlation between measured and predicted strains was obtained in five of the six rings in which the assumptions of the prediction were valid. A somewhat arbitrary strain distribution was observed in the two most circular rings. The four rings of moderate out -of -roundness collapsed very near predictions based upon a criteria related to the maximum stress level in the outer fibers while the three rings of relatively large out -of -roundness failed at pressures somewhat higher than predicted. The two most circular rings collapsed near a computed pressure when the minimum rather than average section thickness was used in the calculation. Collapse pressures were predicted most accurately when the stress used in conjunction with the failure criteria was defined by the point on the stress strain curve at which marked non-linearity occurred. An analysis of the results indicates that strain distributions in an out -of -round ring loaded by uniform external pressure can be predicted with satisfactory accuracy provided the assumptions made in the prediction are satisfied; namely, that the thickness to diameter ratio be the order of 0,0285 and that the initial configuration assumed is actually predominate. A failure criteria based upon the stress level in the outer fibers vd.ll, when the assumptions above are fulfilled, predict collapse quite accurately in rings of out -of -roundness to thickness ratio between 0.10 and 6,30. At larger values of out -of -roundness the criteria is conservative but not over cautious. It is recommended that the experimentation be extended to include a quantitative investigation of the effects of deviations from a basic two lobe out -of-roundness such as might be obtained in a practical situation. Such an investigation should be conducted using rings of constant thickness in order to avoid many of the unnecessary complications encountered in the analysis of data obtained in this thesis.
URI
http://hdl.handle.net/10945/14183
Collections
  • 1. Thesis and Dissertation Collection, all items

Related items

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

  • Thumbnail

    Photoelastic study of interrupted pressure vessel frames 

    Ballantine, James Clement, Jr. (Massachusetts Institute of Technology, 1967-06);
    The objective of this thesis is to obtain an understanding of the variation in stress on the cardinal axes of a circular penetration with elliptical reinforcements in a simulated stiffened cylindrical pressure vessel. The ...
  • Thumbnail

    A study of failure in carbon/foam sandwich composites with stress concentration 

    Sistare, Peter J. (Monterey, California. Naval Postgraduate School, 1995-09);
    Both experimental and numerical studies were performed to understand the failure mechanism of carbon/foam sandwich composite plates with stress concentration. The plates had circular holes and were subjected to bending and ...
  • Thumbnail

    Sea Ice Thickness Distribution in the Arctic Ocean 

    Bourke, Robert H.; Garrett, Robert P. (Elsevier, 1987);
    Structural characteristics of transitionally rough and fully rough turbulent boundary layers are presented. These were measured in flows at different roughness Reynolds numbers developing over uniform spheres roughness. ...
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.