Elasto Plastic Yielding Torque, in this case, a portion of the shaft from the outer surface would
have yielded plastically and rest of the cross section will still be in elastic state. And is denoted by Tep. Elasto Plastic Yielding Torque is usually measured using the Newton Millimeter for Torque. Note that the value of Elasto Plastic Yielding Torque is always positive.