Partition of plastic work into heat and stored energy in metals

This study investigates heat generation in metals during plastic deformatio n. Experiments were designed to measure the partition of plastic work into heat and stored energy during dynamic deformations under adiabatic conditio ns. A servohydraulic load frame was used to measure mechanical properties a t lower strain rates, 10(-3) s(-1) to 1 s(-1). A Kolsky pressure bar was us ed to determine mechanical properties at strain rates between 10(3) s(-1) a nd 10(4) s(-1). For dynamic loading, in situ temperature changes were measu red using a high-speed HgCdTe photoconductive detector. An aluminum 2024-T3 alloy and alpha-titanium were used to determine the dependence of the frac tion 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 s train but not strain rate, whereas they were found to be strongly dependent on strain rate for alpha-titanium.