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Homework Help: Calculating How many load repititions can be applied before failure

  1. Sep 19, 2010 #1
    1. The problem statement, all variables and given/known data
    A metal rod having a diameter of 10 mm is subjected to a repeated tensile load. The material of the rod has a tensile strength of 290 MPa. How many load repetitions can be applied to this rod before it fails if the magnitude of the load is (a) 5 kN, and (b) 11 kN?

    2. Relevant equations

    3. The attempt at a solution
    I'm really not sure how to go about setting this problem up, I was hoping someone out there could show me what I need to do first, second, etc.

    I'm not looking for someone to do this for me, just looking for some advice on what I can do, or read to answer this question.
  2. jcsd
  3. Sep 21, 2010 #2


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    Homework Helper

    Jim4592: First, what is the fatigue strength of this material? Are you using an S-N curve? Can you post the S-N curve? Also, compute the applied tensile stress on the rod.
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