Tonight I did some further testing on the blades, on tonight's agenda:
Tin can test:
This was suggested elsewhere, that I try the blades for opening tin cans.
I did use #1, #2, #5 to open a few cans as they were the only ones with tips remaining. The test did not prove to be informative though... The edge damage across the 3 blades was largely uniform. In each case the edge was rolled and probably not good for a whole lot afterwards.
Blade breakage test (ultimate toughness):
This is one I've been looking forward to. I use the word 'ultimate' here in the same sense as 'ultimate tensile strength', it's a measure of the last little bit of toughness or flexibility that the blade has to give. Not sure that it's the most accurate use of the term, but it gets the idea across.
I find this informative simply because it shows how much abuse the blade can take. I tell my customers not to use their knives as pry bars, but if push comes to shove then in an emergency they're going to do it... I want to make sure that the knife isn't going to fail on them without warning. Failure is fine, and to be expected when enough force is applied (anything will fail given enough force!), but the blade should tell them they're doing something bad well before it breaks!
Each blade was restrained in the rubber-padded jaws of a vise, 7" away from the butt of the test blade. A cheater bar was then attached and the blade was slowly and evenly bent until it broke. Here are the results:
Code:
[FONT=Courier New]
Blade breakage test:
Best
#5 - 60º - lots of warning, even resistance throughout the pull, very energetic when it finally went, shrapnel all over!
#2 - 55º - lots of warning, even resistance throughout
#4 - 30º - resistance increased suddenly before breakage
#3 - 85º - plastic deformation from about 15º onwards, resistance went way down after about 15º, lots of bend remained in the blade, really not ideal
#6 - 25º - resistance increased suddenly before breakage
#1 - 15º - basically no warning, no resistance changes, just sudden brittle failure
Worst
[/FONT]
Each one was recorded at 60 frames per second as it was tested, below are the images from the frame just before the blade failed:
Blade #5 - 60º
Blade #2 - 55º
Blade #4 - 30º
Blade #3 - 85º - Note the deformation near the ricasso
Blade #6 - 25º
Blade #1 - 15º
Finally, the blades as they are after the test, note that #3 is very bent: