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Projectile impact contact time

  1. May 5, 2014 #1
    I am interested to know if there is possible to find out the contact time by a colliding object into a plate, given material properties? My object is to find out the pressure on a plate using force acting on an area.

    What i know:

    Mass of both projectile and target plate
    Impact velocity of projectile
    Density of both projectile and target plate
    I also know yield strength, ultimate strength.. for the plate.
     
  2. jcsd
  3. May 5, 2014 #2
    If the object is really to know the pressure then I think you will need to know the geometry and elastic properties of the plate and also that of the projectile.
     
  4. May 6, 2014 #3
    Well I know the dimensions of the bullet and plate, like radius, length and width, height of the plate. I could also know some elastic properties of the plate if I find a table that would give me those properties as a material.

    The main thing I want to know if there is some way to calculate the contact time. That way I can calculate the Pressure with Force/Area. (I need the time in the force calculations)
     
  5. May 6, 2014 #4

    A.T.

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    Science Advisor
    Gold Member

    Check out all the complicated stuff that goes on in such collisions:

    https://www.youtube.com/watch?v=QfDoQwIAaXg

    You can't seriously expect a simple formula for pressure, based on some basic parameters. For non destructive collisions you could use FE-software. But the destructive stuff would be a challenge even with that.
     
  6. May 6, 2014 #5
    I know that this subject is very complicated, and that is why I want to know a way to calculate contact given material properties, that way I can find out if the plate will withstand the pressure from a bullet. There are three different scenarios: No indentation and bullet does not leave a mark, indentation where bullet hits, and last the bullet will penetrate the target.
    I have watched that video a lot, and to decide what scenario a bullet will do, I only need to check pressure against the Yield strength and ultimate Strength for the plate. I dont want to simulate the complete process, only first find out what scenario I am dealing with.
     
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