battle- knife vs. knife

B

bdmicarta

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Feb 16, 2012
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6,149
I watch this youtube channel sometimes- their tests can be fun and sometimes informative. They basically smash stuff with their press.

In this video they test knife edges against each other- which knife will cut into which one with the least amount of damage. I've seen people cut through nails and while real nails used in construction aren't as soft as they used to be, they are still a lot softer (lower yield strength) than the blade of a good knife. I've wondered if you can really cut through a nail without affecting the edge of your knife. Well apparently you can't cut through another knife blade without affecting the edge.

 
Sounds like 'The HydroloicPress Channel'. 😁
Shame the video has been pulled. Might have been worth a chuckle.
 
Of course that the edge of the knives will break each other. Knife cut by slicing and not just pressing.
1 - The micro, even nano level, serration is generally what allow the blade to cut, it is the real thing about sharpness. Pressing hard on usually asks for more force, mass and durable geometry.
2 - Despite the difference between what we consider as soft and hard for knife blades, it is still merely a small spectrum of hardness used by the industry. There are other steels and hardness for different jobs and trades, the bigger differences in the hardness spectrum play more to the "what crush what".
 
Swords often met edge-to-edge in sword fighting times. Blades would notch. A good one wouldn't break.
 
Without seeing the video, I don't know the parameters of the test.

Edge geometry would be just as important as HRC. An obtuse grind would win against a very acute total edge angle, assuming same hardness. Thickness behind the edge would determine how much damage is dished out, or received.

An obtuse edge would have better shearing capability if we are talking perpendicular force directly down on the opposing knife's edge. A very obtuse edge would shear the thinner acute edge and most likely have less damage.
 
It's not about the knife: it's the heart of the Man that matters.
 
celticrogues said:
You... needed a Youtube video to tell you that??
Click to expand...
I could have guessed but it helps to see it. We know that a good knife can cut through a nail without significant damage to the edge, so how close can the 2 steels be in hardness before the harder one takes damage?
 
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