In an experimental study of the behavior of an iron rod fixed at one end and subjected to torsion at the other it was found that there is a marked tendency of the rod to remain in the state of strain which it has acquired. When the torque was raised to a relatively high value and then reduced to zero the strain tended to remain. It was found to disappear in about twenty-four hours however. The residual strain in the rod is evidently the result of the reluctance of the metal to change its molecular arrangement.
Proceedings of the Iowa Academy of Science
©1927 Iowa Academy of Science, Inc.
Singer, George and Steele, Edwin
"Departure from Hooke's Law in the Torsion of Rods,"
Proceedings of the Iowa Academy of Science, 34(1), 275-276.
Available at: https://scholarworks.uni.edu/pias/vol34/iss1/73