Imperfection Sensitivity of Optimized Structures.

Abstract

There is a tendency of the critical load to become unstable if the lowest buckling modes are simultaneous or nearly so. This tends to be the case if structural panels are optimized with bifurcation buckling constraints. A complete software package, POIS (Panel Optimization with Integrated Software), was developed to solve this problem. POIS is described in a separate report with a summary presented here. The pre-buckling nonlinear behavior due to geometric imperfections is taken into account. The procedure allows optimization with the collapse load as constraint for panels that buckle locally well below the ultimate load. The computer programs are verified by application in some practical cases involving metal and composite material panels. It is concluded that the most weight - efficient design is one in which local buckling is permitted. A supplementary experimental program should be executed before POIS can be qualified as a reliable instrument for panel design. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1981
Accession Number
ADA111681

Entities

People

  • B. O. Almroth
  • D. Bushnell
  • P. Stern

Organizations

  • Lockheed Martin Missiles and Space

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Axial Loads
  • Composite Materials
  • Computer Programs
  • Computers
  • Contracts
  • Eigenvalues
  • Engineering
  • Equations
  • Finite Element Analysis
  • Geometry
  • Materials
  • Plastic Explosives
  • Statistical Analysis
  • United States
  • Waveforms

Fields of Study

  • Engineering

Readers

  • Structural Dynamics.
  • Systems Analysis and Design