Just a short thought. Not only is it important to not exceed the elastic limit of the material, but it is also V important not to stress the material to its proof stressor beyond. In other words, the material has been bent, but by such a small degree that it may go un-noticed. 1-2% proof stress can cause critical crystal/grain distlocations in some materials which could decrease the ultimate strength of the material by 25-40%. This eats into the Factor of Saftey and even into the normal operating load range, with associated brown pants!
I am sorry if this was boring or incorrect.