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Understanding Fatigue Failures

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vimalkumarp
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understanding fatigue failures
vimalkumarp   4/11/2012 11:43:11 AM
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i am sure you will find the book cradle to cradle very interesting. It is really an eyes opener

Ann R. Thryft
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Re: Mastering the art of designing for fatigue
Ann R. Thryft   4/11/2012 12:57:12 PM
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Dave, thanks for that input. The attitude is one that is, unfortunately, prevalent in several industries. Glad to hear that there are movements to open up things more in materials engineering. Industry associations can play a big part in such efforts.


Scott Orlosky
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Re: Mastering the art of designing for fatigue
Scott Orlosky   4/14/2012 7:11:19 PM
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Thanks for highlighting the fatigue failure mechanism in an new way.  Interestingly enough the same design approaches that reduce stress risers for fatigue failure generally also improve the performance of a part in heavily loaded, non-cyclical stress situations.  Good design practice often yields multiple performance benefits.

David12345
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Re: Mastering the art of designing for fatigue
David12345   4/17/2012 6:06:41 PM
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Yes, we work with ultrasonically driven dental tool manufacturing.  You can quickly reach a fatigue failure at 30KHz if you have a surface finish that can initiate crack propagation.  Excellent article.

I used to get frustrated by friends in my car hobbies discussing bolt failures of rperformance cars. Classic examples were the failures of the Corvette suspension bolts at the ends of the leaf springs. In many cases these were fatigue failures and the friends reactions were to the effect that "these are grade 8 bolts with very high tensile strength, you cannot get better than that!"  Often these high strength bolts failed from brittle crack propagation from fatigue not from gross overstress. Salt pitting corrosion was often the culprit. The strength was less importent than corrosion resistance and anodic zinc plating. Sometimes aircraft hardware with controlled geometry under the head, good thread root shape, and good hole preparation was also helpful.

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