Accession Number : AD0766756

Title :   Plastic Waves in a Rate Sensitive Material. Part II. Waves of Combined Stress.

Descriptive Note : Technical rept.,

Corporate Author : BROWN UNIV PROVIDENCE R I DEPT OF ENGINEERING

Personal Author(s) : Hsu,J. C. C. ; Clifton,R. J.

Report Date : JUL 1973

Pagination or Media Count : 26

Abstract : Experiments are reported in which combined longitudinal and torsional plastic waves are generated in thin-walled tubes of alpha-titanium by subjecting pre-torqued tubes to longitudinal impact. Longitudinal and torsional strain-time profiles are recorded at several stations along the specimen. The experiments show no evidence of an intermediate constant state region; furthermore, a final constant state region is not observed even though the latest times of observation are greater than the time at which, according to a strain rate independent theory, a constant strain-rate region is expected. Straightforward generalization of the rate dependent theory of Part I (AD-766 755) to allow for combined stress states leads to a theory which predicts the observed strain-time profiles with good accuracy. (Author)

Descriptors :   (*TITANIUM, STRESSES), CREEP, STRAIN(MECHANICS), PLASTIC PROPERTIES

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE