期刊
EXPERIMENTAL MECHANICS
卷 40, 期 2, 页码 113-123出版社
SPRINGER
DOI: 10.1007/BF02325036
关键词
plastic work; heat; infrared detectors; dynamic; stored energy; cold work; high strain rates; Kolsky bar/SHPB
This study investigates heat generation in metals during plastic deformation. Experiments were designed to measure the partition of plastic work into heat and stored energy during dynamic deformations under adiabatic conditions. A servohydraulic load frame was used to measure mechanical properties at lower strain rates, 10(-3) s(-1) to 1 s(-1). A Kolsky pressure bar was used to determine mechanical properties at strain rates between 10(3) s(-1) and 10(4) s(-1). For dynamic loading, in situ temperature changes were measured using a high-speed HgCdTe photoconductive detector. An aluminum 2024-T3 alloy and alpha-titanium were used to determine the dependence of the fraction of plastic work converted to heat on strain and strain rate. The flow stress and beta for 2024-T3 aluminum alloy were found to be a function of strain but not strain rate, whereas they were found to be strongly dependent on strain rate for alpha-titanium.
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