THE EFFECT OF INITIAL IMPERFECTIONS ON THE COLLAPSE STRENGTH OF DEEP SPHERICAL SHELLS

Abstract

An analysis is developed to account for the effects of imperfections on the collapse strength of spherical shells. The analysis is empirical but is based on an engineering evaluation of recent tests of near-perfect deep spherical shells and spherical caps. Sixty-two models were machined with local thin spots and flat spots and subjected to external hydrostatic pressure. The analysis is in good agreement with experimental results despite the severity of imperfections selected to test the analysis. The limitations of the analysis are discussed and curves showing the relationship between out of roundness and local radius are presented to aid the design engineer in establishing acceptable tolerance limits for fabrication of spherical shells.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1965
Accession Number
AD0612100

Entities

People

  • Martin A. Krenzke
  • Thomas J. Kiernan

Tags

Communities of Interest

  • Ground and Sea Platforms
  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Agreements
  • Curvature
  • Design Criteria
  • Engineering
  • Equations
  • Fabrication
  • Geometry
  • Hemispherical Shells
  • Hydrostatic Pressure
  • Materials
  • Measurement
  • Mechanical Working
  • Mechanics
  • Model Basins
  • Residual Stress
  • Ship Model Basins

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Tribology (the study of the boundary interaction between sliding surfaces, lubrication, wear and friction).