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Author Topic: Weapon impact calculations  (Read 553 times)

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Aragorn splits orc helmet
« Reply #15 on: March 17, 2021, 11:49:15 am »
Andúril came down upon his helm. There was a flash like flame and the helm burst asunder. The orc fell with cloven head.

The shear strength of iron is 20 J/cc.
Medieval helmets were about 0.2 cm thick. 0.0143 cm in RW figures, I think.
The cut is therefore probably 0.0143 x 0.02143 x 4 = ~0.001226 cc

0.001226 x 20 = 0.02452
Mouse level

Plus the orc's skull, which we'll just assume is double the volume of the helmet.

0.001226 x 51.6 x 2 = ~ 0.1265
Supermouse level

0.02452 + 0.1265 = 0.15102
Supermouse level

This is possibly a slight underestimation, but would the blow shatter the sword?

Fragmentation figure for Damascus steel is 814.5 J/cc.
Volume of the sword is 0.0545 cc from the previous calc.
814.5 x 0.0545 = 44.39025 Human level
No, it wouldn't.
« Last Edit: March 18, 2021, 02:05:23 pm by Dutch »
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Quintuple decapitation by Thranduil
« Reply #16 on: March 17, 2021, 08:50:07 pm »
'

In the calc-before-the-last one, I got 0.2552 J for a decapitation. Thranduil takes off five:
0.2552 x 5 = 1.276
Supermouse level

Could he do it?
Sword demensions: 0.04 x 0.3 x 1.85 = 0.0222 cc
Density of steel: 7.75 g/cc
Mass of the sword: 0.0222 x 7.75 = 0.17205
Speed of swing: 40 m/s ÷ 14 = ~2.857

0.17205 x 0.5 = 0.086025
2.857 x 2.857 = ~8.1624
0.086025 x 8.1624 = 0.70217046 joules (Supermouse level)

No, he probably couldn't.
« Last Edit: March 18, 2021, 01:59:32 pm by Dutch »
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Thorin impaling and decapitating goblins
« Reply #17 on: March 18, 2021, 01:55:03 pm »


The decapitation is basically the same as this one, so it's probably Supermouse level.

The impaling is more interesting. I think we can use shear strength for it as well, but I'll try compressive just in case.
Volume of the cut: 0.051 cc (3 x 0.34 x 0.05)

Compressive: 12.9 j/cc x 0.051 cc = 0.6579 j
Supermouse level

Shear (probably more accurate): 4.4 j/cc x 0.051 cc = 0.2244 j
Supermouse level

Since compressive is based on squishing or pulverization, shear is the way to go.
« Last Edit: May 06, 2021, 03:39:35 pm by Dutch »
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Qui-Gon Jinn shatters a sword
« Reply #18 on: March 28, 2021, 04:51:20 pm »
https://comicvine1.cbsistatic.com/uploads/original/12/124590/5467633-rco017_1464079090.jpg

To violently fragment 0.0545 cc of steel requires:
0.0545 cc x 568.5 J/cc = 30.98325 J

Human level (low-end)
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ICEwave's weapon
« Reply #19 on: June 07, 2021, 06:28:44 pm »
https://battlebots.fandom.com/wiki/Icewave

Battlebots wiki states that ICEwave's spinning bar weighs 47 lbs and spins at 300 mph. Plugging that into a KE calculator gives us...
191720.64488277 J
Wall level

Oh my. Wow.

Stupid me. I used linear KE, not rotational. The real answer is 44 kJ (Wall level).
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« Last Edit: September 09, 2021, 04:49:29 pm by Dutch »
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Tombstone weapon
« Reply #20 on: June 07, 2021, 06:33:10 pm »
https://battlebots.fandom.com/wiki/Tombstone#Design_and_Versions_of_Tombstone

Tombstone's spinning bar weighs 65-75 lbs. I'll average with 70.
The speed of the bar is 400 mph.

507629.13065888 J
Wall level

Sorry, I used linear KE, the real answer with the new tip speed limit is 79 kJ (Wall level).
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« Last Edit: July 27, 2021, 10:57:18 pm by Dutch »
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