I did some google searches on torsion, torque, moments, stresses, elasticity, etc.... But I was unable to find out how to go about figuring this problem out. The only thing I found was an equation for torsional resilience, which is denoted as 'U'. The equation is U = Ø^2GIp/2L, where G is the shear modulus, Ip is the polar moment of inertia, Ø is the angle of twist, and L is the length of the tube. I have all the information I need to solve this equation, and I figured that at a given angle Ø, if U is greater then the applied torsion, then the tubing will 'spring' back to its original shape. However, when I tried to solve it, the numbers were not making sense. I have a feeling that this is not the right way to solve this problem. So if anyone can help me or point me in the right direction as to how to go about solving this problem, I would greatly appreciate it. Thanks in advance.