the Chi-Ha's 16 mm of armour bouncing/blocking 37 mm/2-pounder/45 mm rounds according to reports from Malaysia and after-action reports of the Khalkhin Gol Battle), is echoed throughout discussions on it while at the same time it's denied by other people as myth. The claim that the Japanese armour is FHA, or was at least very hardened on the Brinell scale when compared to other nations, which allowed them to take more punishment than you would expect the armour to take (i.e. I decided to try looking a bit deeper and well, the most useful piece of information led be back to War Thunder to this even older post talking about the quality of Japanese armour most specifically the Chi-Ha's armour. What originally got me asking this question is that I was compiling a list of the issues with Japanese GF (bugs with vehicles, etc v1 version) and stumbled upon this old Steam discussion saying their armour should be FHA. I did find that saying pretty much all of the tanks, except for the Chi-To, used FHA though he doesn't give any information beyond that. Kind of like how russian 76mm would shatter if it shot at the vorpanzer of Pz III M and L, makes it invulnerable against early MD-5 fuze at +500m if you angle it a bit. I think i saw the post war documents about this a while backīut in theory its not much different than normal RHA and it shatters shell in contact with it that arent as hard as the armor. Against other shells the FHA probably would've been better, but without any to test the USN couldn't really know that. Thus, the RHA was more effective for a given thickness. This was due to the face hardened armor they were using being incapable of breaking the nearly indestructible AP shells the USN was using at the time. The USN actually used RHA for their battleship turret faces in the 1930s and 40s. It is also less effective at high angles due to a broken projectile being harder to deflect. But if the plate can't break the projectile, it is significantly weaker. If the plate can break the projectile, it has similar resistance to a significantly thicker plate of RHA. These two kinds of armor work very differently. The hard face is designed to break a projectile, allowing the softer backing layer to "catch" the pieces more easily. ![]() ![]() There is often a thin transition layer, and then the rest of the plate is fairly soft, much like RHA. The front face is incredibly hard (several times the Brinell hardness of most RHA), but that face usually only makes up ~30% of the plate's thickness. Unlike homogeneous armor, it has different hardness levels at different depths of the plate. It bends and stretches, helping it more easily deflect a projectile.įHA (face hardened armor) works by breaking projectiles. It is usually of relatively low Brinell hardness, which makes it somewhat flexible. RHA (rolled homogeneous armor) works by deflecting or stopping projectiles. I have no idea if Japanese tanks used FHA or not, but I know a good bit about how armor works.
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