<DOC>
<DOCNO>
462
</DOCNO>
<TITLE>
photo-thermoelasticity .
</TITLE>
<AUTHOR>
gerard,g and gilbert,a.c.
</AUTHOR>
<BIBLIO>
j.app.mech. 24, 1957.
</BIBLIO>
<TEXT>
  this paper summarizes the optical and physical properties
of the photoelastic model material paraplex p-43 over
the temperature range from room temperature to -40 f .
descriptions are presented of techniques and equipment
developed to obtain the modulus of elasticity, the material
fringe value, and the thermal-expansion coefficient as a
function of temperature .  experimental investigations
were conducted into the plane-stress problems of a disk
contracting upon an elastic inclusion and the transient
thermal-stress field produced by a temperature differential
suddenly applied to the upper edge of a long beam .  the
data are correlated with theory using the material properties
obtained in the calibration phase .  also included are
photographic results of an exploratory investigation of the
thermal-shock phenomenon produced by the sudden application
of a temperature differential upon plastic beams
of various length-depth ratios .
</TEXT>
</DOC>
