02-20-2019, 06:07 PM
(02-20-2019, 05:45 PM)EOU Wrote: Very interesting Jan and Sam. Would you be willing to share a little more, Sam, with the Exchange about how your modeling program works? To put it more succinctly, we're asking for a little "schooling" here so that we can better understand what you're teaching here.
Hi All,
I am a Mechanical Engineer by day. I stumbled upon knives, because I am also a home chef, and wanted to "understand" sharp more.....2 yrs later...
a tormek,
a PT50B
a 2 stage paperwheel honing station
a 60x lighted loop
you guys have cost me all my vacation money.....and maybe next years as well.....
But Honestly, I thank all of you on here, as well as a trove of other guys who have posted super interesting tech stuff, or answered my stupid questions...
FEA ( Finite Element Analysis) is something that I do.....but it is always on a macroscopic scale.....I have never played with it at microscopic scale......so I decided this would further my understanding.
Low forces on very small areas lead to high force per unit area numbers.....this in turn can create both tensive and compressive stresses in the material under load.....I was simply curious as to what those values might be when chopping a carrot or potato.....
Most steel ( in my experience in industry) has a yeild of 50-100 ksi ( 1000psi) in tension....and all steel has a youngs modulus about the same regardless of the steel....so......I applied it to a blade made from something I had numbers on.
This was a static/elastic simulation.....in reality this is well beyond looking at plastic deformation of burrs and the likes....but at a base level it tells me things.....that stresses might actually be beyond yield at the nodal level.
For 5 lbs of force, I find that kinda cool!
I will do the DE Blade, once I have the constraints......lets see!
Sam