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Old December 7th, 2007, 05:13 PM   #1
Dana60CJ
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Default Roll Cage Design Website

I recently built a sweet cage for my Jeep and lost it off a trailer in an accident three days later. The cage took a lot of force to one side but was gusseted with three lateral support bars and 8 angle gussets but still scissored on me. I was wondering if anybody had come across some real world, comprehensive sites on designing roll cages.

Thanks
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Old December 7th, 2007, 09:25 PM   #2
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Old December 8th, 2007, 07:58 AM   #3
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Neat software for a computer, and I'm sure you could probably put the cage through some computer tests to determine strength after you designed it.

Kind of in the right direction but I just haven't had any luck finding a site that is in depth about design, strength, shapes that are stronger than others etc.

Thanks though.
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Old December 8th, 2007, 07:59 AM   #4
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what bent, got any pics what and material was used. also what was the speed of the crash and did the trailer land on it also.
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Old December 9th, 2007, 09:16 AM   #5
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We were going about 50 MPH. The trailer pounded it a least one good time. It was a stock roll bar, with a 1.75 .120 wall HREW front kit from M.O.R.E. See the bent HREW in the pic. Everything else done by me is .120 DOM which didn't bend it just contorted at the welds. The whole top of the cage shifted over about 8 inches, the bottom just bent with all six frame mounts attached solid and in good shape.

Heres a shot of the cage, any input about how it could be built stronger would be great. It also has 4 horizontal bars, one windshield, one for the five points behind the seats and two spanning the floor. I guess it was just fast and I'm lucky it held up that good at all.

Pictures in this thread.

http://www.greatlakes4x4.com/showthread.php?t=69654
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Old December 9th, 2007, 10:04 AM   #6
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Actually it looks like it held up fairly well for a 50mph side hit. It shifted because it could have used an angled piece from the top corned near the drivers head down to the lower corner bellow the passengers butt. If rolled off road I think it would have certainly saved your life and probably not shifted as much unless it was a very hard roll on rock. Also, cages are meant to be replaced after a hard roll anyway so it would have served its purpose. Not to sound like im on pirate but all it needed was more trianglulation.
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Old December 9th, 2007, 12:12 PM   #7
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if you were in that jeep the cage wouldve saved ur life, id say it worked..
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Old December 9th, 2007, 01:37 PM   #8
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Actually it looks like it held up fairly well for a 50mph side hit. It shifted because it could have used an angled piece from the top corned near the drivers head down to the lower corner bellow the passengers butt. If rolled off road I think it would have certainly saved your life and probably not shifted as much unless it was a very hard roll on rock. Also, cages are meant to be replaced after a hard roll anyway so it would have served its purpose. Not to sound like im on pirate but all it needed was more trianglulation.
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A little more gusseting and triangulation here and there adn you were in pretty good shape. Would have protected you nad the occupents, which is most important.
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Old December 9th, 2007, 01:49 PM   #9
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Thanks for the input you guys got me thinking now. After seeing what happened I was thinking of putting an X behind the seats and above the occupants heads instead of straight bars. With those thoughts re-enforced by all of you I'm looking forward to building a bigger badder cage.

Thanks for the ideas.

Last edited by Dana60CJ; December 9th, 2007 at 01:52 PM.
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Old December 9th, 2007, 02:08 PM   #10
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triangles are your friend
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Old December 12th, 2007, 11:35 PM   #11
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A simple, functional cage platform.
http://www.greatlakes4x4.com/showpos...2&postcount=93

You can lose the rear triangle if you put an X in the b-hoop as well. If you want to have a backseat, it's going to take a little more design.

It looks like your cage help up well enough to protect you in that situtaion. But even an overkill cage will deform after a few hard rolls.
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Old December 13th, 2007, 07:16 AM   #12
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Originally Posted by UP_ROKTOY View Post
x2

A little more gusseting and triangulation here and there adn you were in pretty good shape. Would have protected you nad the occupents, which is most important.
X3

good work !!!

you dont wheel at 50MPH and it held up well

sucks about how it got tested
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Old December 13th, 2007, 08:53 AM   #13
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x4 on what was said.

If you look at that cage, there are no members which prevented it from folding side to side, which is what it did.

Triangles require a member to bend for a triangle to fold. So the strength is created by the structural member. Looking at that cage from the back, its like a big rectangle. All of your strength now is only in the joints.

An X-brace behind the rear seats would help and side-to-side integrity.

Its bent, yeah, but you would still have been fairly well protected by that.


Also, If you are looking for a strong cage, then ditch the stock parts, and have it all bent up from the same material.
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