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Cybertruck Stainless Panels are falling off ...Is this a new phenomena?

Mini2nut

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Tesla uses adhesive on a lot of the Cybertruck SS panels. Front valance, cantrail and quarter panels for sure.
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shopaholic

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Is this still a problem with VINs in the 60k + range?
 

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Tesla uses adhesive on a lot of the Cybertruck SS panels. Front valance, cantrail and quarter panels for sure.
The issue is not the use of modern structural adhesives. When used properly these adhesives are as strong or stronger than welds or mechanical fasteners. The issue could be one of the following: which structural adhesive they use, the preparation of the surfaces or the design of the surfaces that did not facilitate the proper bonding between parts.

In other words, half ass engineering by Tesla.
 

koolio

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The issue is not the use of modern structural adhesives. When used properly these adhesives are as strong or stronger than welds or mechanical fasteners. The issue could be one of the following: which structural adhesive they use, the preparation of the surfaces or the design of the surfaces that did not facilitate the proper bonding between parts.

In other words, half ass engineering by Tesla.
Think you meant manufacturing, not engineering ?
 


mongo

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No, I meant engineering. No amount of manufacturing expertise can overcome bad design and engineering.
Adhesive selection is fine with correct preparation when used with steel/ stainless steel. So main possibility is improper prep at manufacturing. Especially given the images of failures showing adhesive failure not cohesive.
 

Deleted member 22486

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Adhesive selection is fine with correct preparation when used with steel/ stainless steel. So main possibility is improper prep at manufacturing. Especially given the images of failures showing adhesive failure not cohesive.
The absolute most wonderful thing about a forum like this is you get people arguing about the most esoteric things. They’ll argue with you, even though they not doing the research or they’re blissfully unaware of your background when you make statements. This is a great example of that.
 

mongo

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The absolute most wonderful thing about a forum like this is you get people arguing about the most esoteric things. They’ll argue with you, even though they not doing the research or they’re blissfully unaware of your background when you make statements. This is a great example of that.
Hmmmm, apparently ?

Technical datasheet
Peel strength is 30 pounds per inch of width with the failure within the adhesive (not delaminating). So if one side of the assembly lacks glue after separation it was probably a prep issue.

https://multimedia.3m.com/mws/media/1399517O/3m-panel-bonding-adhesive-08115-tds.pdf
The adhesive used in this application is reportedly 3M™ 08115, it has a peel strength of 30 pounds per inch of width and fractures in the glue (when tested with steel). If it delaminated from the stainless, that could indicate a lack of surface prep.
It is also listed as handling welding operations within 5cm, so it's fairly heat resistant. It can be cured at temps of 200F, wheras PPF has a recommended limit around 176F (80C).
Yeah, technicial data sheet test setup is
Solvent wipe (MEK/Toluene)
Abraded with P80
Solvent wipe (MEK/Toluene)
The adhesive contains 10 mil glass beads to set a minimum thickness. The shear strength is over 2000psi.
I don't think we've established that the carrier has a highly different coefficient of expansion. Steel vs stainless maxes out at around 6 ppm per degree C. If the piece is 2 m long and was assembled at 25C, then assuming uniform shrink at -40C we get 65*6*1*10e-6=390x10e-6m = 0.39 mm differential or 1.5x the minimum bond thickness. Note the shear strength increases at colder temps.

Differential could be worse if they heat cure at 200F (93C).
Restrained 2m steel object with delta coefficient of expansion of 6ppm, temperature swing of 65K, Young's modulus of 200, and crossection of 100mm² (1.2mm*80mm) (.0001m²) is 7800N or 1754 pounds. So a square inch of adhesive at either end would restrain it in shear. If it bulges, all bets are off (especially since I'm not a mechanical engineer).
https://www.engineeringtoolbox.com/stress-restricting-thermal-expansion-d_1756.html
 

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Hmmmm, apparently ?
Dude- oh my gosh. Let it go. Go do some housework or clean the film off on the inside of our massive windshields. Find something else to do here (other than googling the properties of structural adhesive or mechanical fasteners… Stay away from that. ?)
 

BannedByTMC

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Dude- oh my gosh. Let it go. Go do some housework or clean the film off on the inside of our massive windshields. Find something else to do here (other than googling the properties of structural adhesive or mechanical fasteners… Stay away from that. ?)
Why don't you provide a technical explanation as to why he is wrong?
You even state that surface prep could be the issue:
the preparation of the surfaces
 


Deleted member 22486

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Why don't you provide a technical explanation as to why he is wrong?
You even state that surface prep could be the issue:
Holy shit! This is so interesting to me. OK here’s my explanation… Gremlins.

BTW, I didn’t say he was wrong, I said he corrected me when I said it was faulty engineering, not faulty manufacturing and I really did mean “engineering“.

And yes, I did say it could be surface prep, but that could be on the “engineering” side as well. Meaning the procedure was not spec’s out correctly when the vehicle was “engineered” (instead of blaming it on the poor schmuck on the assembly line.)

Then again, it really could be gremlins.

Seriously though, you people need to get a life and just let this go.
 

BannedByTMC

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Seriously though, you people need to get a life and just let this go.
Well some of us have inquiring minds and like to know technical answers to problems. You basically said "It could be anything but I'll call it engineering" which is less than informative. I'd suggest that if you have nothing helpful to offer you might want to take your own advice and "get a life and just let this go".
 

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Well some of us have inquiring minds and like to know technical answers to problems. You basically said "It could be anything but I'll call it engineering" which is less than informative. I'd suggest that if you have nothing helpful to offer you might want to take your own advice and "get a life and just let this go".
Done and ignored going forward
 

Sandman1962

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A friend of mine was installing a PPF wrap of his CT. When tucking the rolled edges using a little squeegee tool, you do use a bit of force kind of wedging it in. I heard a few “cracking” sounds which very well could be from separating the steel from the adhesive. Just something I thought about sharing.
 

Deleted member 22486

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A friend of mine was installing a PPF wrap of his CT. When tucking the rolled edges using a little squeegee tool, you do use a bit of force kind of wedging it in. I heard a few “cracking” sounds which very well could be from separating the steel from the adhesive. Just something I thought about sharing.
You’re probably right.
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