Unfortunately I left the job where I've got access to FEA yesterday. For the static model you can probably do it fairly accurately using singularity functions - I might have a go later.
I wouldn't see 2% as being a particularly big change - I bet we change the stiffness a hell of a lot more by moving the hub 5 mm on the axle. But when I say they are grouped from 200 to 210, changing hardness doesn't change the modulus or density that much. 200 to 210 is pretty well the entire range of steels available anywhere.
Where do you work? If you've people working on stress analysis there I'd be really interested in their views on what makes a hard axle behave differently from a soft one. I still don't buy the dynamic argument, but am willing to be convinced.
|
|