If I am drilling through bars of different material(ex: iron, steel etc.) of the same thickness and under the same conditions of drill operations(feed rate and rpm), how will the torque and thrust force measurement change for different materials? For example, let us assume that the materials in question are iron, steel and aluminium.
For different materials their are different wear properties depend on structure ( composition and microstructure). The torque and thrust force measurement will be changed for different materials.
The torque is proportional to the shear modulus G, and the shear modulus is proportional to Young's modulus E and inversely proportional to Poison's ratio.
I think it will be safe to say that for different material the torque required will be higher, the higher the E of the material, not proportionally because there is also the effect of Poison's ratio. This is my opinion.
Drilling through iron, still and aluminum , say in the order I enumerated them , you should see torque relatively higher in iron, follow by steel and then aluminum. Iorn is the hardest and so the higher the torque require to brake the cohesive force within its molecules of ferrite.
Steel on the other hand is ferrite +Crome , in this case, I assumed the material added to iron to become steel makes it to be more ductile, so the molecules have been adulterated and thus the require force to brake the molecule is lesser compare to that of iron.
If the material added to iron makes it more brittle depending on if it is quenched during alloying process or allowed to Cool down in natural air. It might make it harder than iron. The force in this case might be harder than than of of iron.
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