Sonic Fatigue Test Methods at Elevated Temperatures
Final rept. Mar 1971-Dec 1972
MCDONNELL AIRCRAFT CO ST LOUIS MO
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Sonic fatigue testing at elevated temperatures has become increasingly important as aerospace vehicle structures are designed for the combined environments. Work is described in four areas related to thermal acoustic testing acoustic simulation, thermal simulation, specimen mounting effects, and instrumentation and measurements. Acoustic field studies considered the directional properties of various fields, as well as coupling of the acoustic fields with structural specimens. Thermal environment studies dealt with predicting temperatures in a heated structural specimen. The design of heating systems was also discussed. In specimen mounting effects, equations were presented to show how thermal loads enter into the general dynamic equations. Panels with free edges and panels with fixed edges were treated in detail. Measurement methods related to sonic fatigue testing at elevated temperatures were surveyed for availability of devices which operate in the combined environment.