on breaking bones

[Rivarstar007]

for a feat this common, a 300-9000 J range is extremely unhelpful, also, why exactly are we using as reference the bones of a 52 yo? I mean, I'm no orthopedic but that's like using the slowest gun to determine bullet-dodging. I've seen people using breaking, dislocating, breaking by the joint and twisting interchangeably, when the study rlly what it did was apply force with 3 prongs, 2 to hold cutted bone pieces in place and one doing the fracturing thingy, so none of the others should really count as breaking. I understand that angle matters because bones are anisotropic, but really? 300 joules for 5 degrees and 9000 joules for 50 degrees? that's all? for what a could find, fracture energy of bone ranges from 5 to 30 J/m2, 100 to 300 for bulk cortical bone link here, no idea if that's useful.

 

[Homie890]

because bones are anisotropicful.

They are what?
What even is this word?

 

[Homunculus_Jr!]

They are what?
What even is this word?

Anisotropic is when a physical property varies depending on direction.

 

[Homie890]

Anisotropic is when a physical property varies depending on direction.

Thanks!

 

[H3110l12345I20]

for a feat this common, a 300-9000 J range is extremely unhelpful, also, why exactly are we using as reference the bones of a 52 yo? I mean, I'm no orthopedic but that's like using the slowest gun to determine bullet-dodging. I've seen people using breaking, dislocating, breaking by the joint and twisting interchangeably, when the study rlly what it did was apply force with 3 prongs, 2 to hold cutted bone pieces in place and one doing the fracturing thingy, so none of the others should really count as breaking. I understand that angle matters because bones are anisotropic, but really? 300 joules for 5 degrees and 9000 joules for 50 degrees? that's all? for what a could find, fracture energy of bone ranges from 5 to 30 J/m2, 100 to 300 for bulk cortical bone link here, no idea if that's useful.

Well, awhile ago, I last saw it come from a calc group member (but it could obviously originate futher back). But I'm planning to revise the specifics of the feat.

Breaking a bone depends on the context of the verse+character in-question, the angle of attack and what bone you're breaking.

• If you've just fractured the chest or face of a reg. person, it would be around 10-B to 10-A since people's punches don't reach 9-C levels of energy. We're forced to work around the oversimplification of our tiers at 10-C to 9-C.
• But if you say... regularly preform peak human feats and fracture a leg of a reg. person (one of the strongest bones are there). It would count, but I don't think it would make sense to say breaking a femur is 10-B+ if it's the strongest bones of the body. Not to mention bone is made up of 3 types of bone tissue and the 100-300 J part is only factors a part of a bone rather than the whole.

A 52 yr old isn't too far from a regular person's durability since everyone practically walks (which bones regularly withstand).

 

[Flashlight237]

Real life always makes things out to be weaker than how wiki calculations make things out to be. Like, for example, according to this, it would take 6000 lbs of force, or 26689.30792 newtons: https://phys.libretexts.org/Bookshe.../Body_Physics_-_Motion_to_Metabolism_(Davis)/

Then again, bones are just as weird with force as trees are. If I were to apply 6000 lbs of force perpendicularly onto a femur over its diameter (2.86 cm according to this: https://pmc.ncbi.nlm.nih.gov/articles/PMC8683396/ ), I'd get this:

26689.30792*0.0286=763.3142065 joules

Whereas if I do the same but parallel to the bone's length (0.4012 meters according to the same source), I'd instead get this:

26689.30792*0.4012=10707.75034 joules

This is all based on calculating the work exerted on the bone and is just an estimate. Bear in mind, this is a femur I used; other bones would be weaker (for example, a rib could break under 3300 newtons of force)

Frank Bruno could break a rib since his punch is rated at 4096 newtons: https://pubmed.ncbi.nlm.nih.gov/3936571/

But there's no way in hell he'd be breaking a femur any time soon.