Optimal design of general stiffened composite circular cylinders for global buckling with strength constraints

Optimal design of general stiffened composite circular cylinders for global buckling with strength constraints

A design strategy for optimal design of composite grid-stiffened cylinders subjected to global and local buckling constraints and strength constraints was developed using a discrete optimizer based on a genetic algorithm. An improved smeared stiffener theory was used for the global analysis. Local b...

Full description

Saved in:
Bibliographic Details
Published in:Composite structures Vol. 41; no. 3; pp. 243 - 252
Main Authors: Jaunky, N., Knight, N.F., Ambur, D.R.
Format: Journal Article
Language:English
Published: Langley Research Center Elsevier Ltd 01-03-1998
Elsevier Science Ltd
Elsevier Science
Subjects:
Buckling
Composite Materials
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Physics
Solid mechanics
Static buckling and instability
Structural and continuum mechanics
Stratified material
Grid
Numerical method
Local effect
Composite material
Optimization
Weight
Reinforced structure
Rayleigh Ritz method
Genetic algorithm
Circular cylinder
Cylindrical shell
Buckling
Strength
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A design strategy for optimal design of composite grid-stiffened cylinders subjected to global and local buckling constraints and strength constraints was developed using a discrete optimizer based on a genetic algorithm. An improved smeared stiffener theory was used for the global analysis. Local buckling of skin segments were assessed using a Rayleigh-Ritz method that accounts for material anisotropy. The local buckling of stiffener segments were also assessed. Constraints on the axial membrane strain in the skin and stiffener segments were imposed to include strength criteria in the grid-stiffened cylinder design. Design variables used in this study were the axial and transverse stiffener spacings, stiffener height and thickness, skin laminate stacking sequence and stiffening configuration, where stiffening configuration is a design variable that indicates the combination of axial, transverse and diagonal stiffener in the grid-stiffened cylinder. The design optimization process was adapted to identify the best suited stiffening configurations and stiffener spacings for grid-stiffened composite cylinder with the length and radius of the cylinder, the design in-plane loads and material properties as inputs. The effect of having axial membrane strain constraints in the skin and stiffener segments in the optimization process is also studied for selected stiffening configurations.
Bibliography:Langley Research Center
LaRC
ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0263-8223
1879-1085
DOI:10.1016/S0263-8223(98)00020-8