Broken full flat ground during batoning

EngrSorenson said:
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Luckily, it wasn’t worse, because it could have been!
 
The axe vs large knife is an eternal debate lol I have both but rarely use an axe. If I need better chopping than my 1311 I'm grabbing the chain saw. Maybe I'm just lazy 😅
 
SharpBits said:
Got a scar on my wrist from an unlucky hatchet bounce. Stuff happens! Thankfully, I was in my own yard and not way out in the bush.
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Well, you must be that incompetent, inept, no hand eye coordination having axe user that arathol was talking about.
 
shinyedges said:
When we cut 12560 armor into parts that go on strykers and tanks, there's radiused features. A proper transition when changing angles is the difference between a part that fails when you need it most and one that lasts a lifetime. Spreading the stress vs concentrating it. Works for vehicles that run over ieds and take rpg hits
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… listen, I don’t know what parts you’re talking about, or their application, but let’s not over complicate anything. You put a round semicircle of any radius into the edge of a piece of bar stock and you didn’t make it stronger, I promise you that. There’s no cut you can make into a bar of steel that doesn’t reduce the strength in bending, period.
 
TC said:
Give it time enough....



ANYWAY, as I said, blades fail due to - or their failure is greatly enhanced by - specific structural defects, most prevalent of which are surface defects - such as badly executed jimping.
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This reminds me of the old stamped beckers, there was failures running through the stamping enough to warrant the switch to laser, I think. I have an almost 13 yo bk2 that's stamped.
 
EngrSorenson said:
… listen, I don’t know what parts you’re talking about, or their application, but let’s not over complicate anything. You put a round semicircle of any radius into the edge of a piece of bar stock and you didn’t make it stronger, I promise you that. There’s no cut you can make into a bar of steel that doesn’t reduce the strength in bending, period.
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You're missing the point, a poorly cut feature that isn't radiused properly can and does cause catastrophic failure. A proper radius all but makes that failure a statistically insignificant decimal place. It's why machinists use radiuses lol
 
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EngrSorenson said:
… listen, I don’t know what parts you’re talking about, or their application, but let’s not over complicate anything. You put a round semicircle of any radius into the edge of a piece of bar stock and you didn’t make it stronger, I promise you that. There’s no cut you can make into a bar of steel that doesn’t reduce the strength in bending, period.
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I don’t believe that’s the argument he was making.
 
shinyedges said:
You're missing the point, a poorly cut feature that isn't radiused properly can and does cause catastrophic failure. A proper radius all but makes that failure a statistically insignificant decimal place. It's why machinists use radiuses lol
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At my old place of employment, we heat treated armor plates that bolted to the bottom of the MRAP. It was critical that we radiused the holes properly, but more importantly, heat treated it properly. Too hard and the that plate becomes shrapnel. Proper heat treat, the metal plate bends and absorbs most of the energy of the blast. Soldiers’ lives were at the forefront of our work.
 
shinyedges said:
How jimping is cut matters. Rounded valleys vs V valleys, the V will cause a crack and it will have a catastrophic failure when it goes. It's ok to have jimping, just properly machined or cut jimping
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In ESEE's case, dumbing down the heat treat so bad that it's stupid soft and overly thick helps mitigate any stress risers that might pop up. ;)😁
 
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91bravo said:
At my old place of employment, we heat treated armor plates that bolted to the bottom of the MRAP. It was critical that we radiused the holes properly, but more importantly, heat treated it properly. Too hard and the that plate becomes shrapnel. Proper heat treat, the metal plate bends and absorbs most of the energy of the blast. Soldiers’ lives were at the forefront of our work.
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What hardness range? Most armor on the exterior is 12560. Non armor is usually a514. 6in+thick v shape hulls of 12560 is blast resistant. .25 thou thick will stop most rifle rounds!
 
shinyedges said:
What hardness range? Most armor on the exterior is 12560. Non armor is usually a514. 6in+thick v shape hulls of 12560 is blast resistant. .25 thou thick will stop most rifle rounds!
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I don’t remember to be honest, but it’s a small window of tolerance. I know they did both Rockwell and Brinell testing to verify.
 
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