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Uploaded At Mar 10, 2025 ^^
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RYD date created : 2025-03-24T09:12:07.476775Z
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Top Comments of this video!! :3
Mechanical engineer here. You got the fatigue limit backwards. Steel has a fatigue limit, i.e. if you keep the stress below the fatigue limit the material strength will stay the same no matter how many times you apply and remove the load. Aluminum does not have a fatigue limit, i.e. the material will get weaker every time stress is applied and removed, regardless of how small the stress is.
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As former test engineer who used to test trailer hitches and design tests for a big 3 automaker. Even though I greatly dislike Elon Musk. This result is quite good. You basically put almost pure tongue load on the hitch. The spec says 10% max tongue load of tow capacity. This held up to over 90% load. There is a SAE proof test that requires the hitch and frame to withstand a 1 time pull test several directions with no more then I think 5 degrees change after the tests, but it is a much smaller load then what you just did. I would be most concerned fatigue strength especially after some galvantic corrosion. Putting a steel hitch with an aluminium frame could cause this problem. The fatigue test uses much smaller loads but requires a large number of cycles. If someone were to misloaded their trailer, this bad they should be charge with manslaughter.
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1:18 When he said Dodge 2500, I thought he was talking about the truck that was backing up next to the Tesla, and I was like, thats some supped up 2500 lol.
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The purple is panel bond.. most likely 3M... back when I went to school during my education in bodywork, we tested welding and panel bond.. the panel bond actually took more pulling then the welds!! The welding ripped before the panel bond gave up!! Don't mistake that purple glue for nothing!
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Seeing a wheel cover pop off when the Cybertruck when being put back on the trailer (14:45) was kind of funny, almost like it spitting out a broken tooth.
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The important takeaway here is that damage in aluminum is cumulative and the constant small strains caused by a swaying trailer, road irregularities, loading and unloading of the tongue weight have a deleterious effect.
I recommend reading the following paper which is available from NIST. You can search for it by its title:
Effects of Prior Static and Dynamic Stresses on the Fatigue Strength of Aluminum Alloys
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You need to look up “fatigue limit”. The actual meaning is counterintuitive. Aluminum has no fatigue limit. Steel does. But that means that steel has a limit where if you keep stresses below that, you can do it over and over again without concern for stress failures. Aluminum weakens even in the elastic zone of deformation and as you said gets weaker every time. This it has no “fatigue limit “ aka safe zone.
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@JerryRigEverything
1 week ago
Welcome to the Cybertruck vs Dodge RAM tongue weight durability test. To see the steel frame 2004 Dodge Ram get tested jump to 11:12 (spoiler: it survives)
We've seen at least 3 other Cybertrucks loose their back end. Its not the hitch that breaks. It's the aluminum truck itself that snaps. Don't let it happen to you!
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