Hi guys, Just a quick question. I have been attempting some problems to do with torsion. Most are pretty standard, you know, find the torque, angular rotation etc. However Im stuck on this one. I have calculated the torque and rotation for a shaft thats at its proportional limit. But the next part asks me to find the same things, but this time the beam is fully plastic. How can I do this?? I have no idea. Thanks guys.