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Symbolic relationship between the input and output load

  1. Jan 18, 2016 #1


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    1. The problem statement, all variables and given/known data
    A testing device has the applied load located at the end of a loading bar. The loading bar is connected by a pin to the post. Find the symbolic relationship between the applied load(the "input" load) and the effective load applied the specimen(the "output" load).

    2. Relevant equations
    Free Body Diagram
    ∑Fy = 0
    ∑Fy = Fs + Piny - P = 0

    3. The attempt at a solution
    So I drew a free body diagram of the loading bar, but I'm not sure if it's correct. I tried to think about what the relationship might be, but all I can see from my diagram is that the input load is equal to the effective load + the pin force in the y direction. Any help with this would be appreciated!
    IMG_0829.JPG IMG_0827.JPG
  2. jcsd
  3. Jan 24, 2016 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
  4. Jan 24, 2016 #3


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    Science Advisor

    Does it help if you consider the loading bar as a lever?
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