News for hackers. Stuff that matters.

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 @12:51AM (#21618662)
If the door panel were made of aluminium, it would dint when hit with a sledgehammer.
[ Parent | on HN ]
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.
[ Parent | on HN ]
Re:Tesla Cybertruck reservations hit 146,000 by taejavu on Sunday November 24, 2019 @03:01AM (#21619057)
Indeed. Do you have a point?
[ Parent | on HN ]
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.

[ Parent | on HN ]
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?

[ Parent | on HN ]