ENGINEERING PROGRESS REPORT ON INVESTIGATION OF THE BASIC MECHANISM OF METAL FATIGUE
Quarterly rept. no. 1, 1 June-30 Sep 1963,
REPUBLIC AVIATION CORP FARMINGDALE NY
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The mechanism of metal fatigue is being investigated by studying dislocation dynamics in single crystals during stress cycling by means of ultrasonic attenuation measurements in the megacycle frequency range. A basic and applied approach are being explored. The basic investigation will be limited to the first cycle of stress--essentially a study of the Bauschinger effect. The applied portion will deal with an evaluation of similar measurements made continuously, cycling to fracture. All studies will be performed on pure, annealed single crystals of definite orientation in order that the attenuation measurements will be susceptible to interpretation in terms of dislocation damping theories.
- Inorganic Chemistry