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Crankshaft Failure Mode Analysis

  1. Dec 21, 2010 #1
    I have a broken crankshaft where I am trying to determine the cause of failure.

    here are some pics of the cracked surface.
    2exvfc9.jpg
    10z9zzc.jpg
    what is known:
    1) the crank shaft was under very light load at time of failure

    What do you guys think?
     
  2. jcsd
  3. Dec 22, 2010 #2

    brewnog

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    Fatigue. Crack propogation originating from the oil drilling shown.
     
  4. Dec 22, 2010 #3
    Thanks for the reply, could you explain how you are able to tell this?
     
  5. Dec 22, 2010 #4

    brewnog

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    1) Beach marks clearly visible showing nucleation site is likely somewhere around the fracture face on the drilling.

    2) 90% of the time they fail like that.
     
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