Date of Award

Fall 1987

Document Type

Thesis

Department

Mechanical & Aerospace Engineering

Program/Concentration

Engineering Mechanics

Committee Director

Jean W. Hou

Committee Member

Stephen G. Cupschalk

Committee Member

Tom Houlihan

Call Number for Print

Special Collections; LD4331.E57W57

Abstract

The Pyramidal Truss Core Panel has been developed to save weight in applications normally devoted to solid plates. Present design formulas use classical beam theory with engineering assumptions made for moment of inertia and shear modulus determinations. Analysis with the SUPERSAP finite element code indicates that the present theory provides good prediction for the plate stresses but may be inadequate for the core stress and deflection determination. Two optimization routines are presented. The first procedure uses a batch file to execute separate programs with SUPERSAP used as the analysis code. The second combines a FORTRAN program used for analysis with the optimization code into a single program. Both procedures are shown to work but with difficulties arising due to non-linearities in the constraint equations and unusually high stress calculations in the core by the analysis codes. Optimization using the batch file may be impractical due to large computer costs associated with the finite element analysis needed for gradient evaluations.

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DOI

10.25777/skhh-8b82

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