Abstract
This paper presents the techniques employed by the author in full-scale structural-test applications utilizing large continuous photoelastic coatings. Emphasis is placed on the procedures employed in making a contoured sheet up to 24×36 in. in size and subsequent machining, bonding and testing techniques. The general preparation and testing techniques employed for a typical missile-structural assembly are presented. Calibration and measurement techniques are presented to illustrate efficient procedures for obtaining birefringence readings on a point-by-point basis with reflection polariscopes or whole-field measurements of shear-stress distribution using remote-controlled cameras when safety considerations dictate their use. Techniques are presented for simplified preparation of isoclinic maps and stress trajectories. The procedures employed for coating removal upon completion of testing are presented, and the photoelastic-coating technique is compared, for a particular structural-test application, with a straingage analysis.
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