Yes, Mr. Grepper, you understand my position to a toothy edge well. I hope that my statement is not internally inconsistent.
My reservations concerning a toothy edge are really based on metallurgical consequences of its generation. As I have already posted, a scratch near the edge which has a width of some 5 micron should reduce the strength of the cutting edge because it locally disrupts the regular steel lattice to a depth which is equal to the edge apex width.
It is a riddle for me how it is possible that the individual teeth of the toothy edge do not serve as a stress raisers where the steel fails. It is known, that a steel object is stronger when force is evenly distributed over its area. When the area is reduced, e.g. by a cracks or teeth, than spots with a localized increase in stress are generated. The steel should fail when this concentrated stress exceeds the material's cohesive strength.
Because the failure does not occur, we are probably still below the fracture strength of the steel.
Jan
My reservations concerning a toothy edge are really based on metallurgical consequences of its generation. As I have already posted, a scratch near the edge which has a width of some 5 micron should reduce the strength of the cutting edge because it locally disrupts the regular steel lattice to a depth which is equal to the edge apex width.
It is a riddle for me how it is possible that the individual teeth of the toothy edge do not serve as a stress raisers where the steel fails. It is known, that a steel object is stronger when force is evenly distributed over its area. When the area is reduced, e.g. by a cracks or teeth, than spots with a localized increase in stress are generated. The steel should fail when this concentrated stress exceeds the material's cohesive strength.
Because the failure does not occur, we are probably still below the fracture strength of the steel.
Jan