A FATIGUE APPARATUS FOR USE IN STUDIES OF CRACK PROPAGATION AND DISLOCATION MORPHOLOGY IN FATIGUE.
NORTHWESTERN UNIV EVANSTON ILL DEPT OF MATERIALS SCIENCE
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A direct stress hydraulic fatigue apparatus has been constructed for use in a study of fatigue behavior and crack propagation in metals. The loading apparatus provides a static load, either tensile or compressive, of up to 290 pounds with a superimposed cyclic load tensile andor compressive of up to 3350 pounds. The frequency of loading may be varied continuously from 560 cpm to 1250 cpm. Both the magnitude of load and the frequency of loading may be altered at any time during a test. Tests may be conducted in various gaseous and vapor environments as well as in vacuum of up to 0.000001. Temperature control is not included in the initial design, but may be added easily. Auxilliary equipment has also been constructed for sample preparation and observation of crack propagation.