So I am designing the suspension for a small formula car. It's a pushrod suspension much like what is shown below:
I am trying to find the required tubing diameter for the loads the car will experience.
The Attempt at a Solution
The free body diagram
The car is assumed to weigh 700lbs, have 60-40 front to rear weight distribution and be in a 2G turn, so the maximum force of the tire is 525lb. θ is assued to be 45°
By the method of joints:
At pinned joint A
At pinned joint B
And the maximum force in the pushrod is around 743lb. One of the tubing thicknesses under consideration is 5/8 .035 4130 chromoly which has a yield strength of 70PSI.
Cross sectional area is
Calculating the stress at maximum load is calculated at around 27000 PSI
I know my statics is rusty but this is wayyyyy off. This tubing thickness is within the range of what other people are using, maybe a bit on the small side. Can anyone point out where I may have gone wrong?
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