<DOC>
<DOCNO>
1039
</DOCNO>
<TITLE>
on transverse vibrations of thin, shallow elastic shells .
</TITLE>
<AUTHOR>
</AUTHOR>
<BIBLIO>
</BIBLIO>
<TEXT>
  an experimental investigation was
made (1) to evaluate previously
published theoretical procedures for
the prediction of stress distribution
for cases of radially symmetric
abrupt change in wall thickness of
thin-walled cylinders subject to
internal pressure and (2) to investigate
the significance of stresses
attributable to the presence of thickness
changes typical of design practice .
one theory was adequate in itself
for solution of the case of continuous
middle surface,. use of the
second theoretical procedure was required
to determine the additional
stresses arising from discontinuous middle
surfaces at the change in
thickness .
  comparisons were made between
theoretical and experimental stress
distributions for cases with continuous
middle and continuous inner surfaces
for radially symmetric changes in
wall thickness of a cylinder
subject to internal pressure for diameter
to larger wall thickness ratios
of 117 and 28 and for the case of a
continuous outer surface for a ratio
of 28 .  in all tests the ratio of wall
thicknesses at the change in wall
thickness was 0.4 .
  there was reasonably good correlation
between theoretical and experimental
curves of stress distribution .
on the basis of this correlation,
it was concluded that the applicable
theories were valid .  it
was shown that inclusion of the stresses
arising from the condition of
discontinuous middle surfaces at a change
in thickness has an important
effect on stress distribution .
  in the case of a cylinder with a
continuous outer surface, the maximum
mean effective stress was of sufficient
magnitude to indicate that
this geometry should be avoided in design
if possible .  the maximum
mean effective stress was not increased to
a significant degree by the
presence of a change in wall thickness in
the other cases .
</TEXT>
</DOC>
