Accession Number : AD0766755

Title :   Plastic Waves in a Rate Sensitive Material. Part I. Waves of Uniaxial 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 : 41

Abstract : Experiments have been carried out in which longitudinal plastic waves have been propagated in thin-walled tubes of alpha-titanium. Strain-time profiles recorded in these experiments show evidence of (1) stress levels considerably above quasi-static values at the same strain (2) decay of the amplitude of the elastic precursor, and (3) variation with distance of propagation of the speed at which a given level of strain propagates. These features of the strain-time profiles are interpreted as indicating that a strain rate dependent theory is necessary to describe the observed wave phenomena. Numerical solutions based on such a theory agree reasonably well with experimental results. For these solutions a plastic strain-rate function is used which agrees with data from quasi-static and split Hopkinson bar tests on the same tubes. (Author)

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

Subject Categories : Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE