Two, simple, strain plasticity experiments that yield Joule's constant (J = 778 (ft lbf)/Btu) are described in this paper. One experiment uses lead-smashing and the other copper cold-working. In both experiments the lead or copper specimens have an attached thermocouple and perform as calorimeters. The equipment is easily constructed at minimal expense and may be used as laboratory experiments. The experimental results gave an average, absolute deviation from Joule's constant of 4.2% for the lead-smashing experiment and 11.8% for the copper cold-working experiment.
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