Quote:
Originally Posted by elvo
Fabs is 100 million percent correct. Technically.
HOWEVER.
There is one little twist in this story. People tend to buy expensive little cars and plow them into solid objects at high speed, I think that is a fair thing to conclude from this thread. So manufacturers are forced to design chassis to cope with that. That is where material strength does influence stiffness, through dimensions.
Example: if the C4.1 chassis were made out of 6061-T6, it would need to be 4mm thick in order to be strong enough. If it had been 7075-T6 - which is very strong - 3mm would have sufficed.
Both materials behave exactly the same in the elastic part of the deformation curve, but the strongest one allows lighter construction, and thus, more flex. A thinner chassis flexes more.
Stronger alloy = more flex. Counterintuitive, eh?
Very similar story: http://www.willswing.com/Support/FAQItem.asp?reqFAQ=66 |
Fabs is right; But it is not just about the materials it is the shape of the part and how it loaded.
http://en.wikipedia.org/wiki/Buckling
http://en.wikipedia.org/wiki/Bending
http://en.wikipedia.org/wiki/Second_moment_of_area
http://www.mdme.info/MEMmods/MEM3000...ea_Moment.html
you need to understand simple elastic bending theory
http://www.roymech.co.uk/Useful_Tabl...am_theory.html
Only bad thing is when you plastically deform the part and bend it back. Is that the material will have lost its elastic properties and bending the part will reduce it fatigue life.
http://en.wikipedia.org/wiki/Deforma...ic_deformation