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"The Stone and the Pitcher - Projectile Perforation of Hardened Armour" by Hal E. Hock


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An interesting article I found that corrects some of the misconceptions that are prevalent in regards to connection between the armour physical properties and its ballistic resistance.

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The equation above gives the following results:

Spoiler

BHN-level-for-securing-maximum-resistanc

 

For example: an 82mm plate would reach the maximum resistance against high velocity/small caliber shells, like the 57mm AP, at BHN of 305, but this would be suboptimal against 75mm shells.

Edit: It's interesting to compare these values to specs for 1942-45 for british tank armour:

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iORZCVB.jpg

 

Edited by Peasant_wb

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Comparing the formula's output with testing results shows a good match between the two, for T/D values above 0,6. The BL for M79 AP are a bit lower, on average, probably because the shell is slightly pointier (1,667 CHR vs 1,4 CHR for 2 pdr shot).

 

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NPL-formula-vs-M79-AP-testing.png

 

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