Crankshaft Failure Mode Analysis

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SUMMARY

The discussion centers on the analysis of a crankshaft failure, specifically identifying the cause of the crack. The crankshaft was under light load at the time of failure, with visible beach marks indicating fatigue and crack propagation originating from the oil drilling site. The consensus among participants is that such failures typically occur due to fatigue, with 90% of similar cases exhibiting the same failure mode.

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  • Understanding of crankshaft mechanics
  • Knowledge of fatigue failure analysis
  • Familiarity with crack propagation concepts
  • Experience with material failure diagnostics
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  • Research fatigue failure mechanisms in mechanical components
  • Study crack propagation techniques in engineering materials
  • Examine case studies on crankshaft failures
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Mechanical engineers, automotive technicians, and materials scientists interested in failure analysis and prevention of crankshaft-related issues.

pbiebach
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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?
 
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Fatigue. Crack propagation originating from the oil drilling shown.
 
Thanks for the reply, could you explain how you are able to tell this?
 
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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