Vibration Stress Measurements in Strong Centrifugal Fields

Following a brief review of existing methods of measuring vibrational stresses in strong centrifugal fields, the authors discuss the characteristics of carbon-resistance strain gages and indicate their method of use. These gages may be calibrated statically and used for dynamic measurements with an accuracy of plus or minus ten per cent; and with present cementing technique they can be applied in fields up to 12000 × gravity. The necessary instruments for use with these pickups are described and several records of aircraft-propeller tip stresses are shown.