what psi do human bones break

[Dwalke]

At what pounds per square inch to human bones break?

[incuriam]

There's no single answer. It depends on which bone, the circumstances of the bone (for example, is it protected by living tissue?), the method used to apply the force, and where exactly on the bone the force is applied.

 

At 700 psi something like a bullet could break a man's skull, but something like a boxer's punch could not. 

[Philtaz]

It also depends on bone density, age etc.  There are several factors so there is no definitive answer.

[booksworth]

30+ years ago I knew a man who did compression tests on lenghts (or possibly lengths) of shin bone - beef, I think. I seem to recall they were very strong, at least up to what the same weight-per-length of steel would produce.

[New Forester]

It's not a pressure question really.  It depends how big the bone is, what the leverage is, and what speed it's being done at.

 

If it's any help, when I'm preparing (fully grown, mature) chickens for roasting I snap their "shin" bones in my hands.  The bone is perhaps six inches long, half an inch thick, and unlike a mammal bone it's hollow.  It takes all my strength -- and I'm quite a strong chap (a blow will do it much more easily though).  Not as strong as similarly-sized steel, but much stronger than, say, hardwood.  Perhaps similar to steel by weight.

[Led_zepplin]

I know that a human femur can withstand upto 325psi