This, seemingly, settles many disagreements, as frequently no one disagrees. This is a relatively complex process that in and of itself only provides a quantitative measurement. Yes, that is true. Everyone sees in the TTCh of a tank the thickness of its armor, but few go to the effort of understanding its quality. This can best be expressed by people with the technical knowledge, by using a mathematical expression of armor hardness, using the Brinnel Scale.
Steel can be very hard, but at the same time brittle.
In fact, this occurred with German armor in 1944-45. All these factors remain relatively hidden, when in fact the resistance of armor to penetration depends upon its quality. For example, the forged armor of the Ferdinand was significantly more resistant to armor-piercing rounds than, say, the rolled armor of the Panther. Similar comments can be made in relation to tank gun ammunition, which is often overlooked. It is usually considered sufficient to provide the caliber, weight, and muzzle velocity of a particular round.