Bi-functional optimization of actively cooled, pressurized hollow sandwich cylinders with prismatic cores

T. Liu, Z. C. Deng, T. J. Lu

Research output: Contribution to journalArticlepeer-review

56 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)2565-2602
Number of pages38
JournalJournal of the Mechanics and Physics of Solids
Volume55
Issue number12
DOIs
StatePublished - Dec 2007

Keywords

  • Active cooling
  • Cellular materials
  • Multifunction
  • Optimal design
  • Pressurized hollow cylinder

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