Title page for ETD etd-12232009-020522
|Type of Document
||Structural analysis of geodesically stiffened composite panels with variable stiffener distribution
||Master of Science
|Griffin, Odis Hayden Jr.
|Johnson, Eric R.
|Date of Defense
A computationally efficient analysis approach is developed to predict buckling load of geodesically
stiffened composite panels under in-plane loads. The analysis procedure accounts for the contribution
of the in-plane extensional and out-of-plane bending stiffnesses of the stiffeners through the
use of Lagrange multipliers in an energy method solution. The analysis is used to isolate the effect
of various stiffener deformation modes on the buckling load and skin deformation patterns of
geodesically stiffened panels under various load combinations.
The analysis routines are then coupled with the numerical optimizer ADS to create a package for
the design of minimum-mass stiffened panels, subject to constraints on buckling of the panel assembly
and material strength failure. Material failure in the skin and stiffeners are estimated using
a maximum strain criterion. The design variables that can be used for optimization include thickness
of the skin laminate, stiffener thickness and height, and positions of straight stiffeners. Applied
loads are uniaxial compression, pure shear, and combined compression-shear.
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