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How to calculate average stress?

  1. May 6, 2016 #1
    hello!

    In the question below, is the average normal force in order to calculate the average normal stress, 8sin60 or 16sin60 or 0?

    https://www.physicsforums.com/attachments/stress-jpg.100364/

    thanks!
     
  2. jcsd
  3. May 6, 2016 #2
    Might be just me, but i can't open that image.
     
  4. May 6, 2016 #3
    OK the free body diagram is this;

    upload_2016-5-7_2-48-56.png
     
  5. May 6, 2016 #4
    What do you think it is
     
  6. May 6, 2016 #5
    I think it's zero, because at that point, the two opposite forces are cancelling each other
     
  7. May 6, 2016 #6

    berkeman

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    Staff: Mentor

    The stress is not zero because there are forces pulling the bar apart.
     
  8. May 6, 2016 #7

    SteamKing

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    Staff Emeritus
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    Ask this guy if the stress is zero:


    10919259-Man-Being-Tortured-On-The-Rack-Stock-Photo-torture-rack.jpg
     
  9. May 7, 2016 #8
    ok then it's 16sin60
     
  10. May 7, 2016 #9

    SteamKing

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    No, it isn't.

    Where does the sin 60 come from?

    Do you know what the definition of "stress" is?
     
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