06-04-2017, 04:51 PM
"Mechanical properties of metals depends on dimensions when the piece is smaller than some 1 mm. It is called size effect. The grains located at metal surface behave differently than the internal grains."
That sure makes sense considering what I see happening. What was really puzzling me was that the burrs could be bent back and forth 30 times and still not fracture, which seems amazing for such a thin little sliver of steel. I'm just about 100% sure that if I did that with the blade itself it would simply snap in half after only a few bends.
I really don't understand burr formation. It almost appears that metal has been "smeared" off the edge of the blade forming a thin foil. That foil is, many times, very resistant to stress fracturing. It sure seems that the role of the surface grains is what I'm seeing.
Thanks Mr. Jan. That explanation makes sense, and helps to explain why such a thin sliver of steel can be so tough to remove.
That sure makes sense considering what I see happening. What was really puzzling me was that the burrs could be bent back and forth 30 times and still not fracture, which seems amazing for such a thin little sliver of steel. I'm just about 100% sure that if I did that with the blade itself it would simply snap in half after only a few bends.
I really don't understand burr formation. It almost appears that metal has been "smeared" off the edge of the blade forming a thin foil. That foil is, many times, very resistant to stress fracturing. It sure seems that the role of the surface grains is what I'm seeing.
Thanks Mr. Jan. That explanation makes sense, and helps to explain why such a thin sliver of steel can be so tough to remove.