Accession Number : AD0650697

Title :   A FATIGUE APPARATUS FOR USE IN STUDIES OF CRACK PROPAGATION AND DISLOCATION MORPHOLOGY IN FATIGUE.

Descriptive Note : Technical rept.,

Corporate Author : NORTHWESTERN UNIV EVANSTON ILL DEPT OF MATERIALS SCIENCE

Personal Author(s) : Wade,Thomas B.

Report Date : 31 JAN 1967

Pagination or Media Count : 95

Abstract : 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 and/or 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.

Descriptors :   (*FATIGUE(MECHANICS), *CRYSTAL DEFECTS), (*CRACK PROPAGATION, METALS), FAILURE(MECHANICS), STRESSES, LOADS(FORCES), HEAT TREATMENT, VACUUM APPARATUS, TEMPERATURE CONTROL, CRACKS

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE