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How thin is "very thin", steelnut? IIRC, the original Wardens were 3/16" thick.
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SR101 or SR-77 flexibility
- Thread starter Coupchoux
- Start date
Amy-0
Moderator
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I just wanted to let everyone know that Eric had a death in the family. He and his family have been traveling this week and I know it has been tough for him
(My heart goes out to Eric and his family)
Steelnut as far as the Swamp Warden goes send it back it will covered by the Swamp Rat Warranty..(Check your PM's)
Amy-0
(My heart goes out to Eric and his family) Steelnut as far as the Swamp Warden goes send it back it will covered by the Swamp Rat Warranty..(Check your PM's)
Amy-0
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I gave this one to a friend yesterday.
His friends at work are watching the WAKI video and flex tests,
So they put this one in a vice to see it flex.
He broke it with one hand and no cheater bar:grumpy:
He guessed the flex at around 10 degrees.
These are very thin and light as a feather.
A totally different knife than the first release.
Actually light enough to be a necker:thumbup:
I did expect it to flex like a noodle though...
I am thinking about giving another to test
Are ya saying that these Wardens are different to the first Swampwarden releases ?
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- Jan 9, 2007
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- 7,198
Are ya saying that these Wardens are different to the first Swampwarden releases ?
They are the same just made of thinner stock.
I am pretty sure there was an issue with the broken one, it's going back to be analyzed.
It should have flexed, and taken a set if pushed too far...
Thanks Amy and Eric, never a doubt what the outcome would be:thumbup:
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I have to agree that the SR 101 edge-holding is really incredible.
- Joined
- Jan 20, 2007
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- 101
In answer to the original question, I think that the most accurate answer is that the through hardened SR-77 would best fit the bill of being flexible.
Within pretty close margins all steels have the same Young's modulus or return-to-true force for a given deflection with the same geometry ( specifically - thickness, profile and length ). Softer steels, with a lower Rc, have a lower yield stress ( there is a little bit of wriggle room here, but in general hardness testing parallels yield because of how the tests work ) where they stop behaving like stiff rubber and start behaving like stiff putty. So when you start bending a blade, if the geometry is the same then the force v bend will be the same until you reach this yield point on the outside and inside of the bend at which point the necessary pull on the soft steel will level out and the blade will now be taking a permanent set. The harder/higher yield blade will keep requiring a higher and higher force and continue to bend without taking a set.
As cotdt pointed out, at a given length a thinner blade will bend further before it reaches yield ( or takes a set ) or fails completely since you can see that the outside of the bend is being stretched less and the inside squeezed less than on a thicker blade
So, the through hardened SR-77 at 58 Rc will still be elastic and will return to true at a point at which the 45 Rc SR-101 will have already taken a permanent set. Mind you through hardened SR-101 at 60 or 61 Rc would probably go higher still. However, if like me you hammer on the spine of your knife with the back of a hatchet for cutting through bamboo rhizomes in ground, then SR-77 or diff tempered SR-101 are both less likely to suffer a catastrophic failure through cracking . For the record I have been using a Yard Hook and the only visible damage is to the coating.
The other trade off is that once you have passed yield, the softer material will usually deform further before cracking through completely. This is where INFI really excels at combining hardness ( high yield point ) with a relatively large amount of deformation before final rupture and good wear resistance together with good corrosion resistance. Swamp Rat have been using differential tempering on SR-101 to parallel the first three properties of INFI as much as possible, while being quite a bit cheaper, but it still dips out on the last one. SR-77 is really good at the first two, and it seems cheaper again, and not so much on the last two.
I hope that helps with your question, Coupchoux.
Within pretty close margins all steels have the same Young's modulus or return-to-true force for a given deflection with the same geometry ( specifically - thickness, profile and length ). Softer steels, with a lower Rc, have a lower yield stress ( there is a little bit of wriggle room here, but in general hardness testing parallels yield because of how the tests work ) where they stop behaving like stiff rubber and start behaving like stiff putty. So when you start bending a blade, if the geometry is the same then the force v bend will be the same until you reach this yield point on the outside and inside of the bend at which point the necessary pull on the soft steel will level out and the blade will now be taking a permanent set. The harder/higher yield blade will keep requiring a higher and higher force and continue to bend without taking a set.
As cotdt pointed out, at a given length a thinner blade will bend further before it reaches yield ( or takes a set ) or fails completely since you can see that the outside of the bend is being stretched less and the inside squeezed less than on a thicker blade
So, the through hardened SR-77 at 58 Rc will still be elastic and will return to true at a point at which the 45 Rc SR-101 will have already taken a permanent set. Mind you through hardened SR-101 at 60 or 61 Rc would probably go higher still. However, if like me you hammer on the spine of your knife with the back of a hatchet for cutting through bamboo rhizomes in ground, then SR-77 or diff tempered SR-101 are both less likely to suffer a catastrophic failure through cracking . For the record I have been using a Yard Hook and the only visible damage is to the coating.
The other trade off is that once you have passed yield, the softer material will usually deform further before cracking through completely. This is where INFI really excels at combining hardness ( high yield point ) with a relatively large amount of deformation before final rupture and good wear resistance together with good corrosion resistance. Swamp Rat have been using differential tempering on SR-101 to parallel the first three properties of INFI as much as possible, while being quite a bit cheaper, but it still dips out on the last one. SR-77 is really good at the first two, and it seems cheaper again, and not so much on the last two.
I hope that helps with your question, Coupchoux.
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Wow. Thanks for all of that, Grouper. Lots of info there.