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Old April 15th, 2016, 01:39 PM   #1
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Default Tube Chassis Node Strength

Looking for some feedback on the strength of a lets call an "open" joint vs a more traditional "bent" joint. Thinking of using this in other areas of the chassis that have horizontal tubes.


For example, the node at the bottom of the windshield.





"Open" joint (tube would be capped off, not left open)







"Bent" joint
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Old April 15th, 2016, 01:47 PM   #2
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Also I could easily slug the open tube so that it cannot be crushed
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Old April 15th, 2016, 02:14 PM   #3
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I see no reason to think it would be weaker. Just seems like more work and it wouldn't look as clean when finished. If I were building a tube chassis like that I wouldn't do that style joint where I didn't need to. In the rear or in an area I couldnt get a tight enough bend to make everything line up and look right I would go with it. Just not for an A pillar
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Old October 27th, 2016, 03:21 PM   #4
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Short of modeling up both types and running some FEA's on them I would wager that the bent joint is the weaker of the two.

Although it does provide a continuous tube from the "roof" line to the floor. The construction is easier as well with fewer tubes that need to be lined up at that joint vs the open joint.

Some trophy trucks are built without the bend.


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Old October 27th, 2016, 03:30 PM   #5
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Chassis is still in process but so far pretty happy with my decision to go with less bent tubes. With limited access to a bender I feel it has saved me time and money. The jury is still out on the aesthetics, we'll see.
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Old October 27th, 2016, 03:35 PM   #6
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Form should always follow function, especially in safety features like a cage. A sweet smooth flowing cage won't pay your hospital bills when it crushes with you inside it. Just my 2 cents.
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Old October 27th, 2016, 06:09 PM   #7
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That's how my cage is setup and I have not had issues with that spot. I sleeved it with 1/4" wall for safety.
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Old October 27th, 2016, 09:48 PM   #8
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Quote:
Originally Posted by Mr. Beefy View Post
That's how my cage is setup and I have not had issues with that spot. I sleeved it with 1/4" wall for safety.
Yea, but you drive like a pussy and are never even at risk of rolling or rubbing tube on anything.
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Old November 21st, 2016, 12:04 PM   #9
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Yea, but you drive like a pussy and are never even at risk of rolling or rubbing tube on anything.
Haha true

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