An elastic-plastic finite element analysis of notched aluminum panels.

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Author
Kaiser, Michael John
Date
1981-03Advisor
Lindsey, G.H.
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Show full item recordAbstract
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
monotonically convergent results were extrapolated using
Richardson's method. Stresses were locally smoothed from
the Gauss integration points to the nodal points. Eight
noded, isoparametric 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 geometries investigated
differ from finite element results by less than one percent
in all cases. The photoelastic works of Frocht were also
compared where applicable. Stresses in the plastic range
obtained from slip-line theory for a rigid-perfectly-plastic
material show excellent correlation to a finite element
analysis of such a material. Comparisons to elastic and
plastic experimental data were made for the panels
analyzed and show good correlation to finite element results.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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