An Elastic-Plastic Finite Element Analysis of Notched Aluminum Panels.
NAVAL POSTGRADUATE SCHOOL MONTEREY CA
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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 Richardsons 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 Howlands 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.
- Metallurgy and Metallography
- Numerical Mathematics