Accession Number : AD0253012

Title :   THE DEVELOPMENT OF ANISOTROPY IN THE YIELD CRITERION FOR 3S-3 ALUMINUM ALLOY

Corporate Author : YALE UNIV NEW HAVEN CT

Personal Author(s) : WELLS, CLIFFORD H.

Report Date : JAN 1961

Pagination or Media Count : 1

Abstract : The variation of the yield stress in tension during torsional prestraining was investigated for thin-walled, tubular specimens of 3S-O aluminum alloy. The yield stress was defined to be the stress resulting in a permanent elongation of ten microinches per inch. Owing to mechanical hysteresis the yield stress in torsion increased only slightly, while an immediate, rapid hardening with respect to tension was observed. The tensile yield stress was also determined for cyclic prestraining in torsion: the hardening wasAPPROXIMATELY THE SAME FUNCTION OF INTEGRATED PLASTIC STRAIN. Three tests for pointed vertices in the yield locus gave entirely different results and showed that the existence of such a vertex depends entirely upon the strain history of this alloy. (Author)

Descriptors :   *ALUMINUM ALLOYS, HARDENING, PLASTIC PROPERTIES, TENSILE PROPERTIES, TORQUE.

Distribution Statement : APPROVED FOR PUBLIC RELEASE