Quote:
Originally Posted by SLO_Z28
The point he is making is that you have only about 1.25 sq inches (assuming its .125 x 6(4x2 patch) as opposed to the surface area of part where the main hoop connects which would be 8 sq inches. You load the main hoop and it would act like a lever arm on the frame and deform. To reduce that you could add another plate underneath where the bend comes down from the hoop and that would slow deformation of the mounting plate.
If you got me some measurements from that picture I could do a few statics calculations and give you a basic idea of how forces would act on it in a collision.
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Couldn't it also be that we added an extension to the frame rail or in this case the subframe connector that is welded into the floor from the subframe to the rear of the passenger main floor? And that Extension is then welded to the floor in a way that no flat plate ever could be? It must weld to the floor in like 10 different planes. Then on top of that on the back side of the base is the rocker and the inner rockers. Plus when we are done we can weld a small kicker from the bottom of the main hoop to the subframe connectors.
Had we have just welded flat plate to the floor I'm not sure where we would find a flat enough section to get anything more then a few square inches of surface area.
I'm not trying to be a much of a smart ass as this sounds, But can you explain how your going to compute how strong that base plate box is? Sure I can go with the fact of just the box welded to the cage. But the fact its welded in 3 planes to the to subframe connector mean your going to have to compute the strength of the subframe connecter that is welded in to the floor by lets say to 12" strips on each side so now you will need to compute the strength of everything bolted in the area of the floor, like the subframe it self and probably the trans crossmember which would be acting in tension with a side impact. Plus the base plate we have is then welded to the the inner quarter, the floor, the inner rocker and the outer rocker would be contributing to the the strength of this piece. I find it very difficult to understand how someone can just to do a quick accurate calculation about this base plate that is not even complete. Because once you find out the fact we plan to add short kickers it will change all calculations.
Thanks