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Stress bicycle chain

  1. Oct 21, 2009 #1

    NDO

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    1. The problem statement, all variables and given/known data

    See attachment for the problem. or visit the link http://i908.photobucket.com/albums/ac286/NDO_02/Capture.jpg

    Basically calculate the stress in the pin and the link in a bicycle chain.

    2. Relevant equations

    the average shearing stress = P/A = F/A
    i think the chain is made of 2 shearing stresses

    F.S = ultimate stress/ allowable stress

    3. The attempt at a solution

    Can someone help. I have no idea where to start. can someone give me a pointer

    cheers NDO
     

    Attached Files:

    Last edited: Oct 21, 2009
  2. jcsd
  3. Oct 21, 2009 #2

    uart

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    Science Advisor

    Your attachment is not yet approved but it looks like one of your class mates has reposted the exact same question here : https://www.physicsforums.com/showthread.php?t=347571

    Perhaps a moderator should merge these two threads.

    You should both start by :

    1. Finding an expression for the tension force in the chain as a function of the crank length, sprocket radius and pedal load.

    2. Find the cross sectional area of both the pin and the link at it's overall narrowest point (make sure you include the pin hole when finding the narrowest point).

    Do the above and the problem should be fairly straight forward.

    BTW. What grade/subject course work is this?
     
  4. Oct 21, 2009 #3

    NDO

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    first year uni

    mechanics
     
    Last edited: Oct 21, 2009
  5. Oct 21, 2009 #4

    NDO

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    with the cross sectional area of the link

    do u just calculate it using the width between the links which is the narrowest part or should i use the area around the hole for the pin or should i treat it as a composite shape

    cheers
    NDO
     
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