Buckling analysis and optimization of blade stiffened variable stiffness panels

Broderick H. Coburn, Zhangming Wu, Paul M. Weaver

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

9 Citations (Scopus)

Abstract

A rapid and robust semi-analytical model is developed based on the Rayleigh-Ritz energy method for the buckling analysis of blade stiffened variable stiffness panels. The method includes the often neglected, yet important, stiffener ange in the analysis by not only accounting for the local increase in stiffness but, for the first time in a Rayleigh-Ritz method, allowing the structure to respond in a discontinuous manner at the location of the stiffness discontinuity. This is achieved by discretizing the panel at locations of discontinuities such as ange edges and assigning each region individual shape functions thus preventing a global C1-continuous response in the buckled mode shape. The model is shown to be in excellent agreement with, and computationally efficient when compared to, a commercial FEA package. The model is then used in a genetic algorithm optimization study to design blade stiffened variables stiffness panels by applying practical design and failure constraints. Results are compared with optimized conventional stiffened panels and for the case considered, mass savings over 6% are shown to be achievable when utilising variable stiffness laminates as the skin on stiffened panels.


Original languageEnglish
Title of host publication56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
Place of PublicationReston, VA, USA
Number of pages15
DOIs
Publication statusPublished - 5 Jan 2015
Event56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 2015 - Kissimmee, United States
Duration: 5 Jan 20159 Jan 2015

Conference

Conference56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference 2015
CountryUnited States
CityKissimmee
Period5/01/159/01/15

Keywords

  • genetic algorithms
  • stiffness
  • structural dynamics
  • buckling analysis
  • computationally efficient
  • genetic algorithm optimization
  • Rayleigh-Ritz methods
  • semi-analysis model
  • shape functions
  • stiffened panels
  • variable stiffness
  • structural design

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  • Cite this

    Coburn, B. H., Wu, Z., & Weaver, P. M. (2015). Buckling analysis and optimization of blade stiffened variable stiffness panels. In 56th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference [2015-1438]. https://doi.org/10.2514/6.2015-1438