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A comment on Tesla Cybertruck reservations hit 146,000. Parent comment

Re:Tesla Cybertruck reservations hit 146,000 by taejavu on Sunday November 24, 2019 @12:30AM (#21618580)
In the presentation they hit the door panel with a sledgehammer. No dint. I don’t think I need to explain what would have happened if it were aluminium.
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Re:Tesla Cybertruck reservations hit 146,000 by inferiorhuman on Sunday November 24, 2019 @12:37AM (#21618613)
Pray tell, what would happen? Saturn famously made their door skins out of plastic. Chevrolet uses fiberglass on the Corvette. Plenty of higher end vehicles use aluminum for the frame, and of course Ford uses aluminum for its light duty truck beds.
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Re:Tesla Cybertruck reservations hit 146,000 by taejavu on Sunday November 24, 2019 @12:51AM (#21618662)
If the door panel were made of aluminium, it would dint when hit with a sledgehammer.
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Re:Tesla Cybertruck reservations hit 146,000 by inferiorhuman on Sunday November 24, 2019 @01:42AM (#21618827)
They dented a steel door as part of the demo. It'll all depend on thickness, alloy, and treatment.
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Re:Tesla Cybertruck reservations hit 146,000 by taejavu on Sunday November 24, 2019 @03:01AM (#21619057)
Indeed. Do you have a point?
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Re:Tesla Cybertruck reservations hit 146,000 by inferiorhuman on Sunday November 24, 2019 @07:52AM (#21620106)
Indeed. Do you have a point?

That they could've made a dent resistant door out of aluminum.

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Re:Tesla Cybertruck reservations hit 146,000 by double0jimb0 on Sunday November 24, 2019 @03:03PM (#21622935)
Not sure exactly what series of aluminum car panels are made from, I highly doubt its 7000 series, probably a 2000 or 5000, maximum Yield strength for T6 temper is in 250-350MPa range. That’s still pretty soft.

Cold rolled full hard 301 stainless has yield strength of 1000 MPa. Tesla claims a 30x ultra hard, no one knows quite what that means yet, so maybe that’s 1500MPa yield strength. So call it 6-8x more dent resistant than aluminum at same thickness.

Tesla is using 3mm thick stainless. I can’t imagine standard car panels are more than 1.5mm thick.

Stiffness grows with square of cross sectional thickness.

So it is plausible Tesla’s panels are 20-30x stiffer than regular door panel.

Maybe that’s where they get their 30X from.

What’s your math say?

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Re:Tesla Cybertruck reservations hit 146,000 by _wzsf on Sunday November 24, 2019 @12:39AM (#21618629)
The "sledge hammer" was a deadblow hammer containing sand or metal beads to distribute impact over a longer period of time.

They used this dead-blow feature on the Cybertruck, but twisted the hammer 90 degrees on the "competitor truck" door. You can even see the effect; in the three hits on the white door, only the two where the hammer was twisted left significant dents. [1]

[1] https://twitter.com/paully_steaks/status/1197915960646107136

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