So far on my roll bar design I have been using all the CAD and FEA(Fancy stress solving program for us lazy engineers) tools I have learned. I started with a plain-jane front tie in kit from smittybuilt, but with 4 spreaders. I ran it through the FEA, and it could withstand 15,000 pounds with little to no effect.
I though that this might be a good number for a slow speed rollover, but then I HEARD hat the "sport bar" tie-ins from smittybuilt are marginal for anything but a side flop-over at low speed. So I now realize I need to set my strength goals higher.
Tomorrow, time permitting at work, I plan to draw up what I want to be my next design iteration and hit it with 150,000 pounds virtually. This will tell me what is fracturing under the high load. This will help in deciding what needs to be reinforced or gusseted.
It will take a few days, but I will post what I have when it gets done. I will throw all the pretty pictures I can up too. Unfortunately I only have linear FEA, which means I cannot predict what the steel ina roll cage will do once it passes it's yield stress, and starts to permanently deform. Those packages are near $100,000. Don't think the boss will sign the PO for that one, especially seeing how we do mainly automotive interior in my division.
I will keep ya'll posted. I look at everyone on here as a friend, and I would hate to lose a friend to a roll over accident trying to push the envelope.
My younger sister is a real Internet whiz-bang too, and we are currently setting up my own jeep page. This could be a nice item on there. Maybe even make it’s way into the fabled Jeep CD-ROM.
Lots of people have asked what software I am using. I am using Pro-E and Pro-Mechanica. The company that makes this (I used to work for them too, so I think I owe hem a plug) software is Parametric Technology Corp. http://www.ptc.com/
<font color=blue> Jesse </font color=blue>
<font color=red> I'm not here for a long time.... I 'm here for a good time. </font color=red>
<font color=green> AOL Instant Messager:</font color=green><font color=blue> jessemyers </font color=blue>