3 ms·

What about by volume? Also, stronger meaning what? There's a combination of factors here: not just whether it breaks, but also how (dent vs crack..). Also, how

What about by volume? Also, stronger meaning what? There's a combination of factors here: not just whether it breaks, but also how (dent vs crack..). Also, how well it ages. Also, how much flex does it have and how does that affect the lifespan of the internal components? I don't know those answers; perhaps carbon plastic wins on all metrics. It would be interesting to learn.

xxs 5y ago
>Also, stronger meaning what? Usually tensile strength. For example: Tensile strength: even a commodity PA6-GF30 (most half-decent tools are made of) is ~110MPa [according to ISO 527], cast Aluminum - would be ~150MPa (22K psi for the imperial folks) depending on the alloy. Of course, most laptops would be using an ABS blend, which is the hallmark low-quality tools. >Dents That would depend on the top finish, not so much of the material itself.
- OJFord 5y ago
  > >Dents > That would depend on the top finish, not so much of the material itself. Would it? If I dropped an aluminium bodied laptop like a Macbook or HP Envy, I'd expect it might scuff and slightly dent at the point of impact. If I dropped the cheapest plastic bodied thing from Currys/Walmart/whatever, I'd expect it might scuff and crack the plastic between screws or something. What top finish would you apply to a cheap plastic laptop to make it 'ding' like aluminium instead of crack in a drop test?
  - smoldesu 5y ago
    Plasti-dip.
  - xxs 5y ago
    I would not consider cracks "dents". I already mentioned the cheap 'ABS' plastic, they would crack (also it's not UV stable). You can look up PA6-GF30 (nylon, 30% glass fiber reinforced) tools and they survive ~2m (6 feet) drop tests. Laptops won't do that as their screens would crash. Here: a popular video[0] of some massive abuse of a multimeter. Again, a good plastic with glass or carbon fiber reinforcement would have similar properties to al-mg body, yet feel cheap as most people consider all plastics quite the same. For example: polycarbonate, 30% carbon fiber would have tensile strength of 150MPa (which the same to cast aluminum) [0]: https://www.youtube.com/watch?v=qlA7-fh5nDQ https://www.youtube.com/watch?v=qlA7-fh5nDQ
    - OJFord 5y ago
      No, neither would I. I was agreeing with the commenter you replied to, that I'd expect a plastic laptop to crack, and a metal one to dent. If it has to be damaged, I'd prefer the dent. You said above that that was more to do with 'top finish' than 'material'; that's what I was responding to - how would you finish crackable plastic material to make it dent like aluminium/alloy instead.

xxs 5y ago

>Also, stronger meaning what? Usually tensile strength. For example: Tensile strength: even a commodity PA6-GF30 (most half-decent tools are made of) is ~110MPa [according to ISO 527], cast Aluminum - would be ~150MPa (22K psi for the imperial folks) depending on the alloy. Of course, most laptops would be using an ABS blend, which is the hallmark low-quality tools. >Dents That would depend on the top finish, not so much of the material itself.

OJFord 5y ago
> >Dents > That would depend on the top finish, not so much of the material itself. Would it? If I dropped an aluminium bodied laptop like a Macbook or HP Envy, I'd expect it might scuff and slightly dent at the point of impact. If I dropped the cheapest plastic bodied thing from Currys/Walmart/whatever, I'd expect it might scuff and crack the plastic between screws or something. What top finish would you apply to a cheap plastic laptop to make it 'ding' like aluminium instead of crack in a drop test?
- smoldesu 5y ago
  Plasti-dip.
- xxs 5y ago
  I would not consider cracks "dents". I already mentioned the cheap 'ABS' plastic, they would crack (also it's not UV stable). You can look up PA6-GF30 (nylon, 30% glass fiber reinforced) tools and they survive ~2m (6 feet) drop tests. Laptops won't do that as their screens would crash. Here: a popular video[0] of some massive abuse of a multimeter. Again, a good plastic with glass or carbon fiber reinforcement would have similar properties to al-mg body, yet feel cheap as most people consider all plastics quite the same. For example: polycarbonate, 30% carbon fiber would have tensile strength of 150MPa (which the same to cast aluminum) [0]: https://www.youtube.com/watch?v=qlA7-fh5nDQ https://www.youtube.com/watch?v=qlA7-fh5nDQ
  - OJFord 5y ago
    No, neither would I. I was agreeing with the commenter you replied to, that I'd expect a plastic laptop to crack, and a metal one to dent. If it has to be damaged, I'd prefer the dent. You said above that that was more to do with 'top finish' than 'material'; that's what I was responding to - how would you finish crackable plastic material to make it dent like aluminium/alloy instead.