Navy fired 76mm APCBC against homogeneous armor hardnesses from 250 to 490 Brinell, shatter gap penetration occurred at from 5% to 15% over 50% penetration limit, which is consistent with some of above results. If one uses 75L40 APCBC FH penetration as norm and estimates other rounds from it (using Krupp equation for FH penetration with 75L40 performance as standard):ģ7 APCBC about 3% low vs. And face-hardened penetration may fall off slower than homogeneous with velocity changes, according to Krupp equation and TM-9-1907. Sherman 75 penetrates 91mm homogeneous (same all the way thru and 240 Brinell hardness) at 0m, but 104mm face-hardened. This is a critical issue for wargaming and research because some APCBC rounds can penetrate much more face-hardened armor than homogeneous. German manufacturing used face-hardening on all front and side hull plates of 30mm to 50mm thickness till mid-1944, which might apply to 30+50 on StuG III, and a large number of panzers with 30mm-50mm on sides. Hard layer is supposed to break projectile nose, even when rounds have armor piercing caps that help to defeat face-hardening. penetration data in TM-9-1907 for face-hardened (FH) armor shows some unusual characteristics.įace-hardened armor has very thin layer of brittle, hard steel backed by ductile, non-brittle armor than absorbs impact and supports hard layer.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |