Bi-functional optimization of actively cooled, pressurized hollow sandwich cylinders with prismatic cores
Volume
55
Pagination
2565 - 2602
Publisher
DOI
10.1016/j.jmps.2007.04.007
Journal
Journal of the Mechanics and Physics of Solids
Issue
ISSN
0022-5096
Metadata
Show full item recordAbstract
All metallic, hollow sandwich cylinders having ultralight two-dimensional (2D) prismatic cores are optimally designed for maximum thermo-mechanical performance at minimum mass. The heated cylinder is subjected to uniform internal pressure and actively cooled by forced air convection. The use of two different core topologies is exploited: square- and triangular-celled cores. The minimum mass design model is so defined that three failure modes are prevented: facesheet yielding, core member yielding, and core member buckling. The intersection-of-asymptotes method, in conjunction with the fin analogy model, is employed to build the optimization model for maximum heat transfer rate. A non-dimensional parameter is introduced to couple the two objectives-structural and thermal-in a single cost function. It is found that the geometry corresponding to maximum heat transfer rate is not unique, and square-celled core sandwich cylinders outperform those having triangular cells. The eight-layered sandwich cylinders with square cells have the best overall performance in comparison with other core topologies. Whilst a sandwich cylinder with shorter length is preferred for enhanced thermo-mechanical performance, the influence of the outer radius of the cylinder is rather weak. © 2007 Elsevier Ltd. All rights reserved.