I wasn't sure. I'm not a Reg fan and have only had a cursory look at pics of the Blade Regs.

Out of curiosity, how does a 90 degree edge induce additional stress? When calculating moment and shear in beams with 90 degree sectional properties no additional stress is measurable due to the perpendicular nature. The stresses are found were we'd expect to see them (parabolic increases at midspan, etc).

Just wondering why bar stock behaves differently.

I know 90d filet welds have more concentrated stress but was curious about bar stock. I don't calculate loads on solids often.

ETA: I assume this is due to compounding Kt?

I'm on my phone and am tired (managing an architectural practice and a farm is a lot to do during summer) so I didn't ask my question correctly: how does a 90 degree corner induce enough additional stress to produce a failure and does it matter if the loads are uniform vs concentrated and applied in which axis (X or Y)?

I know the loads are statically determinate, but am curious about the failure component.

http://www.avweb.com/news/maint/184271-1.html?redirected=1

Scroll down to figure 6 and read the description…… should explain is simply IMO.

Thanks - the stress risers mentioned are on moving parts subject to repetitive fatigue (called creep in static metal design due to uniform loads).

Not sure how this applies to a product that is only subjected to periodic concentrated loads.

Interestingly the cited article also mentions the same type of failure as a result of pits. I guess that's not a concern for Busse (ever see a stripped INFI blade?).

"In time, corrosion pits may mar this smooth surface enough to permit fatigue cracking to begin"

Regardless I guess we'll never know since apparently Busse adds a radii to everything in spite of leaving fatigue crack inducing pits.

I'm headed to bed. Have to start farming in less than six hours.

''night yard

I saw the new guy on Dual Survival (Matt) using his modified Condor knife to drill a hole in some bamboo. The blade shape reminded me of an ASH, but with a less specialized handle shape. He was able to roll the handle between his hands making quick work of the drilling. I thought that was interesting. I could see the old hollow handled Chris Reeve fixed blades really excelling at that.

If one is carrying a blade for self defence the first time your attacker should become aware if it is when he suddenly looses use of a limb or limb functions. His next clue should be the bleeding.

I have some CCTV of a close friend of mine who thought a guy was throwing punches at him. He was fending off each one and in the end used a garbage bin on his attacker as the guy kept pressing the attack. After it was all over I had to point out to him that the other guy was actually trying to stab him and he had not seen the blade at all.... !!!!!

Another specification....

Architect, due to knives being metal I do believe they are subject to repetitive fatigue. I believe you are correct about the pitting on competition finish being a stress riser, as well. Technically even the smallest of scratches could be, too.

This is my current choice or close to it for a perfect survival knife.




I reserve the right to change my mind in an instant with not prior warning. LOL