Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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.
    [​IMG]
    [​IMG]
    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

    User Avatar
    Science Advisor
    Gold Member

    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

    User Avatar
    Science Advisor
    Gold Member

    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.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Similar Discussions: Crankshaft Failure Mode Analysis
  1. Historical failures (Replies: 16)

  2. Compressive failure (Replies: 3)

  3. Material failure (Replies: 2)

Loading...