An Elastic-Plastic Finite Element Analysis of Notched Aluminum Panels.

Abstract

Finite element, elastic and plastic analyses of various aluminum panels, containing holes and notches, were conducted for comparison with photoelastic experimental results. A FORTRAN IV program, ADINA (Automatic Dynamic Incremental Nonlinear Analysis), was used for both linear and nonlinear analyses. Mesh refinements were used for each panel and the montonically convergent results were extrapolated using Richardson's method. Stresses were locally smoothed from the Gauss integration points to the nodal points. Eight noded, isoparameteric elements were used throughout. Modification to an ADINA preprocessor program, also coded in FORTRAN IV, was made for use with a VERSATEC plotter. Comparisons were made to the elastic, analytic series solution by Howland for a circular hole in a finite strip. The finite element results varied by less than one percent from Howland's solution. Handbook values for the elastic stress concentration factors of the geometeries investigated differ from finite element results by less than one percent in all cases. The photoelastic works of Frocht were also compared where applicable.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1981
Accession Number
ADA102665

Entities

People

  • Michael John Kaiser

Organizations

  • Naval Postgraduate School

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Boundaries
  • Computational Fluid Dynamics
  • Computational Science
  • Elastic Properties
  • Elements
  • Equations
  • Experimental Data
  • Finite Element Analysis
  • Geometry
  • Materials
  • Mechanics
  • Modulus Of Elasticity
  • Nonlinear Analysis
  • Plastic Explosives
  • Strain Hardening
  • Stress Concentration
  • Stresses

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Mechanical Engineering/Mechanics of Materials.
  • Structural Dynamics.