|
|||||
 |
|
|
|
|
|
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 |
|
|
