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Extended High Order Theory for Curved Sandwich Panels and Comparison with Elasticity

[+] Author and Article Information
Nunthadech Rodcheuy

School of Aerospace Engineering, Georgia Institute of Technology Atlanta, Georgia 30332-0150, USA
nrodcheuy@gatech.edu

Yeoshua Frostig

School of Aerospace Engineering, Georgia Institute of Technology Atlanta, Georgia 30332-0150, USA
cvrfros@technion.ac.il

George A. Kardomateas

School of Aerospace Engineering, Georgia Institute of Technology Atlanta, Georgia 30332-0150, USA
george.kardomateas@aerospace.gatech.edu

1Corresponding author.

ASME doi:10.1115/1.4036612 History: Received March 27, 2017; Revised April 21, 2017

Abstract

A new one-dimensional high order sandwich panel theory for curved panels is presented and compared with the theory of elasticity. The theory accounts for the sandwich core compressibility in the radial direction as well as the core circumferential rigidity. Two distinct core displacement fields are proposed and investigated. One is a logarithmic (it includes terms that are linear, inverse, and logarithmic functions of the radial coordinate). The other is a polynomial (it consists of second and third order polynomials of the radial coordinate) and it is an extension of the corresponding field for the flat panel. In both formulations the two thin curved face sheets are assumed to be perfectly bonded to the core and follow the classical Euler-Bernoulli beam assumptions. The relative merits of these two approaches are assessed by comparing the results to an elasticity solution. The case examined is a simply supported curved sandwich panel subjected to a distributed transverse load, for which a closed form elasticity solution can be formulated. It is shown that the logarithmic formulation is more accurate than the polynomial especially for the stiffer cores and for curved panels of smaller radius.

Copyright (c) 2017 by ASME
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