AlbertDefender90 · Nov 28, 2013

Hi all,

I'm currently doing an assignment at uni and I have based it on a 10 spline halfshaft from a defender. Does anyone know what the material properties of the halfshafts are?

Thanks
Albert

dogsbody · Nov 28, 2013

It bloody hurts if you hit somebody over the head with one?

Try James Martin, this sounds like his territory.

blue beasty · Nov 28, 2013

dogsbody said:
It bloody hurts if you hit somebody over the head with one?

Try James Martin, this sounds like his territory.

I think encouraging violence towards JM is a bit out of order :mil90:

discomania · Nov 28, 2013

You want to know the metallurgy of a half shaft?

It's a high carbon content (which is why if you look at a broken half shaft you can see the metal has a crystalline structure) it's then super super heated and quenched to harden it, it will then be tempered to remove some of the hardness, different heats will reduce the hardness of the metal, a half shaft is pretty damn hard as they don't want them to twist (nightmare to remove) but rather break and obviously they want them hard as hell so the forces can be transferred through them.

They will then use milling and grinding machines to put in the splines etc. they will then be ground at the bearing surfaces where it sits through the inner ring of the bearing which is then polished using abrasive stones and oil lubricant.

AlbertDefender90 · Nov 28, 2013

discomania said:
You want to know the metallurgy of a half shaft?

Yeah, just the tensile strength really, i'm doing some stress analysis and I thought a half shaft might be a good idea seeing as they do seem to break fairly regularly.

danp3 · Nov 28, 2013

Now this is my kind of fred! I cant help but I'd like to know. studying for a BENG

AlbertDefender90 · Nov 28, 2013

danp3 said:
Now this is my kind of fred! I cant help but I'd like to know. studying for a BENG

yeah i'm the same, in my final year now

AlbertDefender90 · Nov 28, 2013

yield strength would be nice aswell

D90mitch · Nov 28, 2013

i've being doing tensile strength at uni recently too but im only 1st year so a bit of a noob at the moment. I dont see how you would get the tensile for it as they wouldnt be tested for that, surely just torsion? or did you just mean the material type?

blue beasty · Nov 28, 2013

AlbertDefender90 said:
yield strength would be nice aswell

Generally considered to be not quite enough

Dr_evil · Nov 28, 2013

Half shaft is EN19 steel 850/1000 N/mm² yield

AlbertDefender90 · Nov 28, 2013

D90mitch said:
i've being doing tensile strength at uni recently too but im only 1st year so a bit of a noob at the moment. I dont see how you would get the tensile for it as they wouldnt be tested for that, surely just torsion? or did you just mean the material type?

Numbers of any description regarding the half shafts would be nice

D90mitch · Nov 28, 2013

Lol don't ask me i'm just intrigued as have been doing this stuff recently!

Turboman · Nov 28, 2013

blue beasty said:
Generally considered to be not quite enough

Could be they are designed to fail to protect other drive train components. Don't know this for fact, but it is common in auto design.

blue beasty · Nov 28, 2013

Turboman said:
Could be they are designed to fail to protect other drive train components. Don't know this for fact, but it is common in auto design.

Propshaft shear pin would be a lot easier to sort out

AlbertDefender90 · Nov 28, 2013

Dr_evil said:
Half shaft is EN19 steel 850/1000 N/mm² yield

I don't suppose you have an official source for that at all?

AlbertDefender90 · Nov 28, 2013

Turboman said:
Could be they are designed to fail to protect other drive train components. Don't know this for fact, but it is common in auto design.

From what ive been reading I think that may be the case, ive seen lots of comments of the KAM halfshafts creating issues as the diff blows up instead of the halfshaft

Turboman · Nov 28, 2013

blue beasty said:
Propshaft shear pin would be a lot easier to sort out

True, and they are commonly used on agric. machines. Land Rover didn't always take the easy way tho

Dr_evil · Nov 28, 2013

AlbertDefender90 said:
I don't suppose you have an official source for that at all?

General knowledge

although if you want to have a source HD shafts from ashcroft are 4340

discomania · Nov 28, 2013

AlbertDefender90 said:
yield strength would be nice aswell

How long is a piece of string, if I was making a half shaft I may use better stronger steel than the manufacturers would use as they need to be sensible and save money!

Assuming it's a chomium molybdenum steel, then it could have a tensile strength of somewhere between about 50000 and 200000psi, it will have a hardness probably in the C Rockwell hardness scale or high B. It depends on the quality though.

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