Torture tested my knife

[nussbaum]

I accidentally broke 1 of my blades yesterday so I figured I would go ahead and torture test the broken piece. I took about a 3 inch long section by one and a half inch wide by .065 inch thick piece of the blade and put it in a vice and bend it over with a pair of vice grips and it bent 90 degrees before it snapped. The first time I bent it to 90, I let go and it sprung back to about 5 degrees. I was able to drive it into the corner of my vice with my hammer with a little damage to the edge, but it drove in about 1/8 inch and stuck there.
Question: what did I do wrong to make it not spring back perfectly?

 

[vwb563]

I dont think any blade can go a 90 degree bend and return to 0. Ive never seen one myself that can.

 

[Sonnydaze]

No, it won't return to zero. Each time you bend it, there will be more metal "fatigue" and pretty soon the blade will snap. You have a LOT of variables going here...

 

[nussbaum]

Thanks guys. I just found the American blade smith society journeyman test they perform on knives, and lookin at some videos theirs don't bend back either.