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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.

inferiorhuman 7y ago
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.
- taejavu 7y ago
  If the door panel were made of aluminium, it would dint when hit with a sledgehammer.
  - inferiorhuman 7y ago
    They dented a steel door as part of the demo. It'll all depend on thickness, alloy, and treatment.
    - taejavu 7y ago
      Indeed. Do you have a point?
      - inferiorhuman 7y ago
        Indeed. Do you have a point? That they could've made a dent resistant door out of aluminum.
        double0jimb0 7y ago
        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?
_wzsf 7y ago
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 https://twitter.com/paully_steaks/status/1197915960646107136

inferiorhuman 7y ago

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.

taejavu 7y ago
If the door panel were made of aluminium, it would dint when hit with a sledgehammer.
- inferiorhuman 7y ago
  They dented a steel door as part of the demo. It'll all depend on thickness, alloy, and treatment.
  - taejavu 7y ago
    Indeed. Do you have a point?
    - inferiorhuman 7y ago
      Indeed. Do you have a point? That they could've made a dent resistant door out of aluminum.
      - double0jimb0 7y ago
        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?

_wzsf 7y ago

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 https://twitter.com/paully_steaks/status/1197915960646107136