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This paper presents a brief history and development of resin-base brittle coatings for experimental stress analysis. These coatings have been in use for a number of years but are limited in operation to temperatures up to approximately 100 F.
A new series of ceramic-based materials has been developed which will operate from approximately —50 to 600 F in a sensitivity range of 200 to 1800 microinches, depending on the coefficient of expansion of the steel on which the coating is applied. These ceramic brittle coatings permit experimental stress analysis on steel parts up to 600 F.
Neither the presence of oil and high humidity, nor slow application of loads affect the test results. Dynamic tests may be conducted with the ceramic coatings in areas where abrasion by air or dust would prevent use of the resin-base materials. Tests may be conducted out of doors for indefinite time intervals. Thermal strains can now be measured by these brittle coatings.
Some illustrations are given of the use of the ceramic coatings to measure stresses on a gas turbine rotor.
Stern, F. B.
Field Engineer, Magnaflux Corp., New York, N. Y.