Hello (long time lurker), I was wondering how one would calculate the protection provided against long rods by a highly sloped piece of RHA like that found on most modern MBT hull and turret roofs. To this end I have two basic questions.
Is it simply the LOS thickness with no shell normalization?
This paper makes the following claim about HHS steel angled at 73-77 degrees:
"The Mass efficiency (Ef) of the target plates was calculated from the DOP results related to the baseline performance of the rod at the relevant impact velocity. The reference penetration is 95 mm in an RHA block at normal incidence. Based on that, the DOP data indicate Ef in the range of 1.07 to 1.09. That efficiency is mainly related to the obliquity advantage, described above."
Would it be reasonable to estimate that non-HH RHA with a greater angle (80-83 degrees) could replicate this mass efficiency?
What angle does RHA need to be to deflect/ricochet/shatter/etc. long rods?
I've seen papers that seem to have different definitions of "ricochet" and different testing setups (which makes interpretation difficult). I was wondering if this forum has reached any conclusion in this area.