Fo0ker t1_j9at67e wrote

Yes, that's literaly the cause of metal fatigue, if you bent a spoon back and forth enough times, it'll look ok but the slighest heating of shift and it breaks because you're breaking what's left of the oringinal form. This is the trick behind Yuri Geller rubbing spoons til they fall apart.

It's also why the british plane Comet crashed, the big windows let the metal flex enough just past the elastic limit to "fatigue" the metal and make little cracks in the structure. Over time they built up and you get planes falling from the sky.