The phrase "bent metal" refers to something made of metal that has been twisted or deformed into a non-straight shape, usually as a result of a collision or accident. Full definition
After hearing stories about people that could bend metal bars, lift horses over their heads and pull cars with their necks I became fascinated with their methods. (ashotofadrenaline.net)
I asked and heard that members do not fight and there is seldom bent metal. (evo.co.uk)
We recommend bending the metal out of the way. (fourwheeler.com)