Vol. 6, No. 9-10, 2011

Download this article
Download this article. For screen
For printing
Recent Issues

Volume 12
Issue 3, 249–351
Issue 2, 147–247
Issue 1, 1–146

Volume 11, 5 issues

Volume 10, 5 issues

Volume 9, 5 issues

Volume 8, 8 issues

Volume 7, 10 issues

Volume 6, 9 issues

Volume 5, 6 issues

Volume 4, 10 issues

Volume 3, 10 issues

Volume 2, 10 issues

Volume 1, 8 issues

The Journal
Subscriptions
Editorial Board
Research Statement
Scientific Advantage
Submission Guidelines
Submission Form
Author Index
To Appear
 
ISSN: 1559-3959
Implications of shakedown for design of actively cooled thermostructural panels

Natasha Vermaak, Lorenzo Valdevit, Anthony G. Evans, Frank W. Zok and Robert M. McMeeking

Vol. 6 (2011), No. 9-10, 1313–1327
Abstract
[an error occurred while processing this directive]

Propulsion systems in future hypersonic vehicles will require use of actively cooled structures that can withstand extreme thermomechanical loads. Candidate designs and materials for such structures have previously been identified through conventional yield-based design principles. The present article outlines an approach that utilizes concepts of localized plasticity and shakedown under cyclic loading in the design process. For this purpose, an established computational technique is used to determine shakedown limits for prototypical cooled structures. The results are employed in a design sensitivity study. The study demonstrates that, by allowing for shakedown, structures with areal densities significantly lower than those obtained from yield-limited design can be obtained. The magnitude of the benefits depends on the specific geometry of interest, the thermomechanical boundary conditions and the constraints placed on the design.

Keywords
shakedown, lightweight structures, elastoplastic design, thermostructural panels
Milestones
Received: 24 May 2011
Revised: 28 July 2011
Accepted: 8 August 2011
Published: 15 January 2012
Authors
Natasha Vermaak
Materials Department
University of California
Santa Barbara, CA 93106-5050
United States
Lorenzo Valdevit
Department of Mechanical and Aerospace Engineering and Department of Chemical Engineering and Materials Science
University of California
Irvine, CA 92697-3975
United States
Anthony G. Evans
Materials Department
University of California
Santa Barbara, CA 93106-5050
United States
http://www.me.ucsb.edu/dept_site/people/evans_page.html
Frank W. Zok
Materials Department
University of California
Santa Barbara, CA 93106-5050
United States
http://engineering.ucsb.edu/~zok/zok.html
Robert M. McMeeking
Materials and Mechanical Engineering Departments
University of California
Santa Barbara, CA 93106-5050
United States