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Smart Materials

  1. Dec 23, 2012 #1
    Is there any material which could change from liquid state to solid state after appiled some force?

    :smile:
     
  2. jcsd
  3. Dec 23, 2012 #2

    mfb

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    Some non-newtonian fluids can do something similar - they will return to the fluid state if the force stops, however.
     
  4. Dec 24, 2012 #3
    a shear thickening fluid (approximately) may serve your purpose. Its viscosity increases considerably when stressed. Best example is a wheat flour dough. Initially it has low viscosity but as you start applying force to make is uniform it becomes more viscous.
    Density wise I cant think of an example (density increasing considerably with applied stress) in semi solid and solid materials.
     
  5. Dec 24, 2012 #4
    In fact corn starch suspension is a very good shear thickening liquid (much better than wheat though), for example you can run over it, but if you walk slowly you will sink: see demo here.
     
  6. Dec 24, 2012 #5
    Thank you Very Much Mr.Alkim,Mr.pukb,Mr.mfb. :shy:
    Now I got an idea, how to make it........... really super video alkim. another thing I want to know that, Is this fluid acts as a Bullet proof?. I mean it will withstand the deformation of the pointed bullet penetration.
    And too this one if the penetration made by the projectile will heals itself? Like self Haling Structure......
    :confused:

    Actually my target is 18mm thickness, I just want to make the target into low penetration material. is that possible by making layer of metal and Non Newtonian fluid to avoid penetration? if I'm using RHA is a target means 3 layers of RHA with 3mm thickness and 3 layers of Non Newtonian fluid with 3mm thickness. the arrangement is like layer by layer, first RHA, then Non Newtonian. this one is my need? is that possible?
     
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