What caused this failure?

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Darrin Sanders

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I know there is no way of knowing for sure by looking at a pic but I'd like your guys to give me me your best guess as to why this blade broke. I have a pretty good hunch but don't want to taint anyones thoughts. These are completely different knives. I just posted the pic of the unbroken blade as a reference.
 

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I also think stress riser from the deep grinding marks on the blade up through the stamped logo.

Stan
 
There is no polite way to explain how misguided, unreasoned and ridiculous it is to ask someone to determine anything from a single, very poor photograph.

All that can be gleaned from the photograph is that the design envelope of the tool was exceeded. All things can be broken with enough force.
 
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Nice Picture , Darrin

No doubt be Stress related to the Logo/Stamping.
I'll be a Monkey's Uncle if it Ain't :D
 
Bush Monkey said:
There is no polite way to explain how misguided, unreasoned and ridiculous it is to ask someone to determine anything from a single, very poor photograph.

All that can be gleaned from the photograph is that the design envelope of the tool was exceeded. All things can be broken with enough force.
Click to expand...

You are right that the design envelope for the blade was exceeded, but my take on this thread from Darrin, is where it broke when it did fail, and that it might have done better without the deep, straight logo line.
 
Since this blade in the picture snapped along that long line on the right side of the stamped logo, I think a stress riser from said stamped logo surely played a part in the blade's breakage.
 
It looks to me like it was used as a pry bar. Any knife that is correctly heat treated will break if used to pry.
 
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