Accession Number : AD0488159

Title :   SUPPRESSION OF CREEP INDUCED BY CYCLIC TORSION IN COPPER UNDER TENSION.

Descriptive Note : Technical rept.,

Corporate Author : COLUMBIA UNIV NEW YORK INST FOR THE STUDY OF FATIGUE AND RELIABILITY

Personal Author(s) : Wood, W. A.

Report Date : APR 1966

Pagination or Media Count : 29

Abstract : As part of a general study of the stability of metals under combined static and cyclic stress some prior treatments of annealed copper are experimented with aimed at suppressing the creep induced by cyclic torsion in specimens under tension. It is found that the creep at room temperature can be suppressed partially if the specimens are subjected to prior cycles of alternating torsion but not that at elevated temperatures. However, creep at both room and elevated temperatures can be greatly reduced by prior tensile strain followed by prior cycles of torsion in that order; the reverse order is ineffective. Reasons for this suppression are discussed in terms of hypotheses which attribute stability to a state where cycles which reverse the external or bulk strain of a metal also reverse the strain at each internal point. (Author)

Descriptors :   (*COPPER, CREEP), INHIBITION, REDUCTION, TORSION, TEMPERATURE, TENSILE PROPERTIES, HARDENING, THEORY, STRESSES.

Subject Categories : Inorganic Chemistry
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE