Surface Pro 3 bends by itself due to heat

Discussion in 'Microsoft Surface Pro 3' started by Perttu Lehtinen, Nov 25, 2014.

  1. Perttu Lehtinen

    Perttu Lehtinen New Member

    Joined:
    Nov 25, 2014
    Messages:
    5
    Likes Received:
    0
    Trophy Points:
    1
  2. ptrkhh

    ptrkhh Active Member

    Joined:
    Nov 15, 2014
    Messages:
    394
    Likes Received:
    77
    Trophy Points:
    28
    Luckily I got the one with the least heat, the i3 model :D
     
  3. RémiM

    RémiM Active Member

    Joined:
    Sep 20, 2014
    Messages:
    488
    Likes Received:
    103
    Trophy Points:
    43
    Location:
    somewhere in between Canada and France
    My Device:
    Surface 3 (Atom)
    It bends due to heat --> sorry to be a little rude, but please do not post irrational comments.

    Do you really believe it ?

    A little bit of material science + mechanics and a little bit of good sense will certainly be very helpful.

    The yield stress of a basic aluminum-magnesium alloy, heat treated let's say T5 or T7, is around 200MPa.

    200 MPa is roughly equivalent to 2000kg per square centimeter.

    Do you really believe that the heat, that by the way would probably help to restore the material if there was any initial residual stress in it, could create a stress superior to 2000kg/cm2 and bend the chassis like magic ???
     
  4. megatronium

    megatronium Active Member

    Joined:
    Jul 4, 2014
    Messages:
    308
    Likes Received:
    70
    Trophy Points:
    28
    My Device:
    SPro3
    Not my i7 256. Maybe I'm lucky. I render with Premiere on this all the time too.
     
  5. jnjroach

    jnjroach Administrator Staff Member

    Joined:
    Nov 9, 2012
    Messages:
    7,105
    Likes Received:
    1,724
    Trophy Points:
    113
    Location:
    Seattle, WA USA
    My Device:
    Surface Book
    If these are bent, it was a manufacturing defect and not caused by heat. The melting point for Magnesium is 650 C or 1202 F, if they are heating to a temperature that significantly softens the metal we have bigger issues.... as that well over the <90 C Thermal Envelope the SP3 maintains.
     
    ctitanic likes this.
  6. Maximus3D

    Maximus3D Member

    Joined:
    Sep 12, 2014
    Messages:
    89
    Likes Received:
    13
    Trophy Points:
    8
    Location:
    Gothenburg, Sweden
    My Device:
    SPro3
    This device is most likely manufactured from an alloy of magnesium and aluminium which is stronger than pure aluminium, however both of them still deforms to some degree.

    My own device has a slight curvature in the upper part of the screen, it's a bit annoying as the keyboard does not lay flat on the display but returning it to get a new one feels like a lot of work for a device which works just fine otherwise.

    I can imagine the metal chassis is so thin that exposure to a higher temperature during a longer time will cause it to deform and 'bend out of shape'.

    / Magnus
     
  7. ptrkhh

    ptrkhh Active Member

    Joined:
    Nov 15, 2014
    Messages:
    394
    Likes Received:
    77
    Trophy Points:
    28
    Agree, I dont think its caused by heat, especially after the i7 user above confirmed. It might be the combination of many factors, like how the kickstand holds the device on either side, but not in the center.
    Could u guys with bent SP3s confirm if you often use your device with the kickstand or not?
     
  8. RémiM

    RémiM Active Member

    Joined:
    Sep 20, 2014
    Messages:
    488
    Likes Received:
    103
    Trophy Points:
    43
    Location:
    somewhere in between Canada and France
    My Device:
    Surface 3 (Atom)
    In this precise case, the melting point has nothing to do with the utopic bending.

    It would be the stress generated by the dillatation of the constrained chassis. And this stress would never exceed the yield strength of the alloy. It's impossible.

    Metallurgically, the critical temperature is 0.5*melting point of the alloy which, as you correctly mentioned, is way to high to be reached.
     
  9. Maximus3D

    Maximus3D Member

    Joined:
    Sep 12, 2014
    Messages:
    89
    Likes Received:
    13
    Trophy Points:
    8
    Location:
    Gothenburg, Sweden
    My Device:
    SPro3
    The problem with metal, especially aluminium is that it's not only the high temperature which melts it, it's will also weaken when exposed to a much lower temperature for a longer period of time.

    Aluminium actually starts to weaken and deform at temperatures at around 100 degrees Celcius, then it exponentially increases as the temperature increases.

    / Magnus
     
  10. RémiM

    RémiM Active Member

    Joined:
    Sep 20, 2014
    Messages:
    488
    Likes Received:
    103
    Trophy Points:
    43
    Location:
    somewhere in between Canada and France
    My Device:
    Surface 3 (Atom)
    Generally pure metals are not used because of their poor mechanical properties.

    The "impurities" (alloy elements) create precipitates inside the aluminum matrix and make the gliding of the dislocations much more complicated. It improves a lot the mechanical properties (mainly the yield strength) of the alloy under static load.

    The effect of the temperature is the dillatation of the material. This dillatation, in the case of metals is isotropic and homogeneous.

    Since the chassis is not constrained and can freely expand, the temperature will have no effect on the integrity of the SP3.

    The only effect it can have is to ruin the glue of the front glass panel, and damage the LCD.
     
  11. jnjroach

    jnjroach Administrator Staff Member

    Joined:
    Nov 9, 2012
    Messages:
    7,105
    Likes Received:
    1,724
    Trophy Points:
    113
    Location:
    Seattle, WA USA
    My Device:
    Surface Book
    Obviously my subtle attempt at a wee bit of sarcasm didn't come across.... my point is this isn't an heat issue, the bend if there is a manufacturing defect and will be exchanged by Microsoft. It is neither wide spread nor indicative of the device....
     
  12. RémiM

    RémiM Active Member

    Joined:
    Sep 20, 2014
    Messages:
    488
    Likes Received:
    103
    Trophy Points:
    43
    Location:
    somewhere in between Canada and France
    My Device:
    Surface 3 (Atom)
    Sorry sir, I totally disagree. It depends on the initial microstructure.

    If the precipitates inside the matrix are coherent and very small (Guinier-Preston zones) the aging of the material will harden the aluminum.

    If the precipitates are initially coarsened, then it will weaken a the microstructure.

    Since we don't know the heat treatment applied on the chassis of the SP3, we cannot state or predict anything.

    No matter what, the temperature has to be high enough to activate the diffusion of the solute elements inside the matrix.

    It is likely that under 180°C nothing happens in aluminum alloys (copper or magnesium as second constituant).

    And 180°C will never be reached here.
     

Share This Page

Search tags for this page
microsoft is restarting due to heat
,
surface 2 bend
,
surface pro 3 bending heat
,

surface pro 3 bends

,

surface pro 3 heat bending

,
surface pro 3 itself on
,
surface pro 3 replaced due to heat
,
surface pro 3 screen bends
,
surface pro glass bent
,
surface pro screen bends