Originally Posted by Tootsall

...............Edit: So the "limit of elasticity" or "moment of elasticity" refers more to the breaking of the grains of metal and resultant work hardening. Minor bending past the limit of elasticity can generally be restored provided thinning has not taken place. Severe bending past the limit of elasticity can result in stretching of the metal to the point where thinning of the original sheet occurs and it is difficult to eliminate or minimize the wrinkles to where they can't be seen.