Which was the point of the sonic cannon. To counter vibranium
The High 8-C rating comes from violent fragmentation of the tank. Which again, neither Claw or the spears have evidence of.
Pretty sure the High 8-C value of the tank wasn't calculated properly.
That one was calculated using Tensile strength, which we don't use for v. frag (We use high-end shear strength or low-end compressive strength for v. frag), whereas normal frag uses shear strength, which is 0.75 * tensile strength for steels and 0.6 for other stuff since only steel, iron and aluminium have shear strength multipliers.
Since it's depleted uranium, 0.6, and depleted uranium is
1565-1881 MPa tensile strength, so that's 1727 MPa average UTS, 0.6 times that is 1036 MPa for shear strength or frag.
The mass is also wrong, The M1 Abrams is anywhere from 54-66.8 metric tons, averaging out at 60.8 tons, and while not all of it is armor, majority of it is according to
this article, so prolly 75%.
54 metric tons times 0.75= 40.5 tons of armor (Google searches gave tank armor weight at around 32-45 tons so it prolly matches), density of depleted uranium is
18.5-18.6 g/cm^3 (18.55 g/cm^3 average), so that's a volume of 2183288.4097035 cm^3, 2183288.4097035 * 1036= 2,261,886,792.452826 J or 0.540604 tons of TNT, Building level. This is the low-end but the high-end is prolly not gonna go beyond 8-C methinks.