Abstract
The specific heats of Armco iron which was cold compressed with a high-speed working velocity (about 4.3m/s) and a low-speed one, were measured by Sykes' method, and stored energies were calculated and compared with each other. The results were as follows:
(1) The stored energy was released in two steps.
(2) The ratio of stored energy to the working energy were 4.9% in the case of the high-speed working velocity and 9.4% in the case of the low-speed working velocity.
(3) The stored energies increased proportionaly to log (ho/h). Here ho is the height of uncompressed samples, h is the height of samples after compression.
(4) The authors can not clear the difference of the stored energies between the case of high-speed compression and low-speed one within the accuracy of this experiment. Lastly, they discussed the results using Mott and Stroh's theory.
