1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Shear stress resisted by a bolt

  1. Jan 6, 2017 #1
    1. The problem statement, all variables and given/known data
    In this problem , why the author use (30x10^3) /s = VQ / I only ? Shouldnt it be 4(30x10^3) /s = VQ / I

    2. Relevant equations

    3. The attempt at a solution
    I said so , because the board at the centered is connected by 4 bolts , 2 on the left and 2 on the right . The faces on the right also resisted by the same arrangement of nails , right ?

    Attached Files:

    • 519.PNG
      File size:
      24.4 KB
    • 520.PNG
      File size:
      7.7 KB
    Last edited by a moderator: Jan 7, 2017
  2. jcsd
  3. Jan 8, 2017 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    Where did the 30x10^3 come from? Regardless, your method is wrong. In determining Q for bolt shear, either you use the top right board full area, or the top left board full area, or the middle and 2 bottom areas divided by 2 ( this last method not recommended, but may help conceptually with your understanding).
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted