Register to reply

Crankshaft Failure Mode Analysis

by pbiebach
Tags: failure analysis
Share this thread:
pbiebach
#1
Dec21-10, 06:45 PM
P: 5
I have a broken crankshaft where I am trying to determine the cause of failure.

here are some pics of the cracked surface.


what is known:
1) the crank shaft was under very light load at time of failure

What do you guys think?
Phys.Org News Partner Engineering news on Phys.org
Hoverbike drone project for air transport takes off
Student develops filter for clean water around the world
Developing the next evolution in underwater communication
brewnog
#2
Dec22-10, 01:55 PM
Sci Advisor
PF Gold
brewnog's Avatar
P: 2,794
Fatigue. Crack propogation originating from the oil drilling shown.
pbiebach
#3
Dec22-10, 02:07 PM
P: 5
Thanks for the reply, could you explain how you are able to tell this?

brewnog
#4
Dec22-10, 02:12 PM
Sci Advisor
PF Gold
brewnog's Avatar
P: 2,794
Crankshaft Failure Mode Analysis

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.


Register to reply

Related Discussions
To find mode of key failure Mechanical Engineering 7
Failure analysis of a 2 OD solid 6063 aluminum round bar Mechanical Engineering 5
Normal Mode Analysis Atomic, Solid State, Comp. Physics 5
Normal Mode Analysis+IR/Raman Atomic, Solid State, Comp. Physics 0