Accession Number : AD0665868

Title :   EFFECT OF VACUUM ENVIRONMENT ON THE MECHANICAL BEHAVIOR OF MATERIALS.

Descriptive Note : Annual rept.,

Corporate Author : MARTIN CO DENVER COLO

Personal Author(s) : Shen,Harold

Report Date : DEC 1967

Pagination or Media Count : 36

Abstract : The fatigue and crack behavior of some commonly used metals has been examined at reduced atmospheric pressures. Work revealed that for Aluminum alloys 1100 and 7075, Armco iron, and the Ti-6Al-4V alloy, there are three stages of the relationship between fatigue life and pressure. The magnitude of the dependence on air pressure and the pressure ranges of these various stages were found to be very sensitive to the type of material and changes in cyclic frequency, temperature, and applied stress. The report discusses the experimental results and the theoretical analysis of this work and the potential impact of the results on the theory of fatigue mechanics. (Author)

Descriptors :   (*METALS, *VACUUM), FATIGUE(MECHANICS), ENVIRONMENTAL TESTS, PRESSURE, STRESSES, ALUMINUM ALLOYS, IRON, CRACK PROPAGATION, TENSILE PROPERTIES, NOTCH SENSITIVITY, MECHANICAL PROPERTIES

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE