Dakar.I like those big gussets up top!
what sort of racing is that chassis for?
I am currently working on a machine to make those gussets.
Dakar.I like those big gussets up top!
what sort of racing is that chassis for?
But what would have happened hat those gussets not been there? Unsupported tube is unsupported tube. A gusset just makes the effective span shorter.
Probably, the cage would still have collapsed without the gussets due to lack of triangulation. The tube would not have ripped in half but it would still have bent.I don't think changes in gusset design would have substantially changed the outcome in this case.
With the direction that the tube was forced in the rollover, Im not sure this gusset would have done any better. The force applied found the weak point and snapped it. Am I wrong in thinking that? Would love to add some more strength to my chassis with this type of gusset, I just don't see how you can plan for every scenario. Can anyone explain?
This is pure bullshit for the kind of use any vehicle with a roll cage sees, especially as speeds get higher and the potential range of impact speeds gets higher.The idea with a roll cage is not to make it completely stiff but to have it absorb energy and not collapse on the driver. Energy absorbed in the cage is not trasferred to the driver which can lead to less driver injuries.
This is pure bullshit for the kind of use any vehicle with a roll cage sees, especially as speeds get higher and the potential range of impact speeds gets higher.
A cage that deforms enough to keep your dumb ass from breaking ribs when you lawn dart off a sand dune at 50mph will crumple like it's not there if you lawn dart at 65mph or barrel roll off some rock ledges in a way that is less favorable to the cage.
You're basically advocating for using the cage as a single-use spring to absorb impact. And we all know how good springs are at absorbing impacts except in the most narrow of ranges.
I can understand that people who get their engineering knowledge exclusively from the soyboys on Reddit or some other cesspit of degeneracy may feel temptation to mimic automotive crumple zones but you have to understand that those primary exist to buy time for airbags to deploy and don't really do fuck all for the occupants except in a very narrow window of speeds and impact types.
If you're worried your cage is too strong buy a better seat and harness.
This is pure bullshit for the kind of use any vehicle with a roll cage sees, especially as speeds get higher and the potential range of impact speeds gets higher.
A cage that deforms enough to keep your dumb ass from breaking ribs when you lawn dart off a sand dune at 50mph will crumple like it's not there if you lawn dart at 65mph or barrel roll off some rock ledges in a way that is less favorable to the cage.
You're basically advocating for using the cage as a single-use spring to absorb impact. And we all know how good springs are at absorbing impacts except in the most narrow of ranges.
I can understand that people who get their engineering knowledge exclusively from the soyboys on Reddit or some other cesspit of degeneracy may feel temptation to mimic automotive crumple zones but you have to understand that those primary exist to buy time for airbags to deploy and don't really do fuck all for the occupants except in a very narrow window of speeds and impact types.
If you're worried your cage is too strong buy a better seat and harness.
You are 100% correct.I have 0 expertise in this matter except what has come from magazines and Irate. I thought the bigger problem was the lack of gussets and elsewhere and where I circled in red. Doesn't this spot focus all the force that cage recieves into a point causing it to pinch thus removing all its resistance to bending. I think we are focusing on the break but to me it looks like it only broke where it did because it was the stiff spot. I think it shows more that you can't just put triangles in one spot and expect it to be enough for the whole cage.
You are 100% correct.
The area you circled caused a plastic hinge that caused the tube wall to buckle. The whole cage folded back and the top of the tube tore at the stiffness transition. If curved gussets were added in front of and behind the area you circled as well as behind the A pillar the cage probably would not have failed as spectacularly.
One thing missed is the gusset is perpendicular to the tube when it should be tangential if it’s a plate gusset. You can see where it folded strait in on the end of the gusset. Better cage design would obviously have helped more but plate gussets can do more harm than good if not put in the proper location. That why I am a huge fan of taco gussets.I have 0 expertise in this matter except what has come from magazines and Irate. I thought the bigger problem was the lack of gussets and elsewhere and where I circled in red. Doesn't this spot focus all the force that cage recieves into a point causing it to pinch thus removing all its resistance to bending. I think we are focusing on the break but to me it looks like it only broke where it did because it was the stiff spot. I think it shows more that you can't just put triangles in one spot and expect it to be enough for the whole cage.
Either way you're splitting hairs. Better gussets may have let it collapse 1" less, it's still a failure imo. Actual diagonal braces like what 84 bronco posted are the only thing that would have been a major difference.One thing missed is the gusset is perpendicular to the tube when it should be tangential if it’s a plate gusset. You can see where it folded strait in on the end of the gusset. Better cage design would obviously have helped more but plate gussets can do more harm than good if not put in the proper location. That why I am a huge fan of taco gussets.
Correct, like I said better design would be best, but the point was plate gussets should never be perpendicular to the centerline of the tube. All that causes them to do is crease and fold.Either way you're splitting hairs. Better gussets may have let it collapse 1" less, it's still a failure imo. Actual diagonal braces like what 84 bronco posted are the only thing that would have been a major difference.
Definitely.Correct, like I said better design would be best, but the point was plate gussets should never be perpendicular to the centerline of the tube. All that causes them to do is crease and fold.
She was pretty hot.... Also I was in my mid 20's so, pussy was motivation for a lot of bad decisions!She must have been to wreck your shit on purpose?
The roof x only ties the a and b pillars together. It helps, but doesn't do a whole ton of support for the type of incident pictured. What you want is a b pillar x, especially with exos. They inherently weak by being larger and typically mounted to a less sturdy structure like the sliders. I like to do an x down to the frame. It also helps my piece of mind that in a really hard endo that the cage won't just push the rocksliders off the frame and crush you.
I've had 3 exos I built on heavy 1 ton Toyotas take hard endos off man made large culvert pipe obstacles and hold up really well.
Found some good pics of 1
So really, there are better and worse materials obviously, but design trumps all imo.
Dakar.
I am currently working on a machine to make those gussets.
I'd not be so quick to post this. I rolled a well built jeep cage one time. It "looked" as straight as an arrow also. ...I rolled my SxS 1.5 times last weekend and was hit by another car in mid air and my chassis/cage is still as straight as an arrow....
The aluminum bumpers act as my "crumple zones" to absorb impact but not transfer it to the chassis.
2
I have most of the parts, just need to put it together. I also need the room to do it, the shop is kinda project clogged at the moment.How did this go?