Plastic Waves in a Rate Sensitive Material. Part I. Waves of Uniaxial Stress.
BROWN UNIV PROVIDENCE R I DEPT OF ENGINEERING
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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
- Metallurgy and Metallography