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