Tuesday 26 May 2020

76 mm vs T-34

Even though the T-34 was not designed to withstand 76 mm AP shells, trials with various kinds of 76 mm ammunition were still included in the tests of defective hulls and turrets.

"d) Firing 76 mm type 2-03545 armour piercing shells

Trials of the 2-03545 shell, accepted into service, are shown in table 11 and on figure 50. The table shows data for two different hulls: shots 21-24 and 155-168 were fired at the first hull, shots 48-58, 113-125, 140-146, and 149 were fired at the second hull.

Component
Thickness, mm
Bearing
Plate angle
Impact angle
Limit of partial penetration
Limit of complete penetration
m/s
equiv. distance at V0=655 m/s
m/s
equiv. distance at V0=655 m/s
Front hull
45
0-90
60
60+
Cannot penetrate at any angle
Vertical side
45
40
0
50
650
Point blank
-
-
45
45
0
45
-
-
650
Point blank
45
50
0
40
545
800


45
70
0
20
-
-
545
800
Sloped side
40
40
40
60.5
650
Point blank
-
-
40
55
40
51
545
800
-
-
40
70
40
44
545*
800
-
-
40
75
40
42.5
-
-
545
800
Rear sloped hull
40
180
45-47
45-47
550
800
-
-
Cast turret
52
-
30
30
520-540
800-1000
650
Point blank
Welded turret
45
-
30
30
550
800
-
-
* At 75 degrees there is no penetration, but the back of the plate shows the impact.

The table and the diagram show that the armour of the T-34 tank, not designed to withstand hits from 76 mm shells, has several components that offer satisfactory resistance. 

First of all, note that the new front hull resists 76 mm shells even at point blank range with the stock muzzle velocity. The hull cannot be penetrated at a bearing of 0-70 degrees by the 76 mm gun with a muzzle velocity of 655 m/s from a distance of 800 meters, and from a distance of 50-100 meters from a bearing of 0-40 degrees. The rear armour cannot be penetrated from a distance of 800 m and higher at a bearing of 180 degrees.

Other angles offer a safe zone that allows for maneuvering in battle conditions (see diagram 50).

The turret of the tank offers less resistance and can hold hits from the 76 mm anti-tank gun only at ranges of 800 m or more. The difference in protection when firing at the front between the hull and the turret is large. 

The T-34 has some features that allow it to effectively combat anti-tank guns up to and including 76 mm in caliber, as only penetration of the turret is possible at a range of 800 meters or less.

e) Firing 76 mm type 3-06969 (sharp tip) proof shells

The 76 mm type 3-06969 sharp tipped proof shell was only used to fire at the front plate to establish its qualities when hit with high penetration rounds (see shots 147-148 of the second hull). 

The results show that the sharp tipped type 3-06969 shell does not penetrate the front armour at muzzle velocity (V0=655 m/s). These trials once again confirm the results of trials with type  2-03545 shells.

f) Firing 76 mm HE fused shells

Due to HE ammunition arriving late, shots at hull #314-45 were fired only after all other calibers were tested. 3 shots were made (see shots 228-230 on the second hull). The results were as follows:
  1. When hitting the bottom part of the turret the shockwave broke the 20 mm thick roof and knocked out the floor of the turret.
  2. When hitting between the bottom of the pannier and the track, the shockwave broke the pannier floor.
  3. When hitting the running gear or nearby (100-150 mm above the track) the damage to the running gear is severe enough to stop the tank.
  4. The main 40-45 mm armour cannot be penetrated by the HE shell shell when firing at point blank range."

3 comments:

  1. I'm always impressed by how well simple HE does against tanks in tests. Even if the main armor is not pierced, the tank seems to get badly mauled if not knocked out.

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    Replies
    1. The shockwave from the contact detonation of a decent-sized shell is no joke, and various "external" components outside the actual armour shell (like the perennial favourite target for as-such outmatched guns, the running gear) naturally take far less to disable.

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  2. The 655 m/s 76mm would indicate the AP not sharp tipped shell here is a BR-350B. The sharp tipped shell is more of a mystery.

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