<DOC>
<DOCNO>
497
</DOCNO>
<TITLE>
theoretical and experimental investigation of thermal
stresses in hypersonic aircraft wing structures .
</TITLE>
<AUTHOR>
tramposch,h.
</AUTHOR>
<BIBLIO>
j. ae. scs. 29, 1962.
</BIBLIO>
<TEXT>
  a simple and relatively accurate analytic approximation is
developed to determine the temperature and thermal-stress distribution
in aircraft wing structures .  theoretical investigations
show that the results of the existing thermal-stress theories
which neglect the temperature gradient through the skin thickness
may exceed, in the range of higher biot numbers, the true
values by more than 30 percent .
  refined photothermoelastic experiments verify these results
and add another significant conclusion .  they indicate that
thermal stresses in wing structures generated by a variable heattransfer
coefficient coincide with the theoretical predictions
which are based on a constant heat-transfer coefficient, as long
as the latter represents the arithmetic average over the heating
cycle and the variation is in the order of 10 percent .  however,
even much greater variations in the order of 100 percent
produce only relatively small differences .
</TEXT>
</DOC>
