URGENT - SOME FATIGUE CYCLING TERMS

[wp1]

Can anyone give any info/definitions of the following?
-coffin-manson fatigue coefficient
-hardening exponent
-coefficient of plastic resistance
Thanks

 

[harry123456]

Look at the first coupld of chapters of this book

Fundamentals of Metal Fatigue Analysis

---bannantine

 

[wp1]

Thanks.

 

[PhV]

Those parameters are mainly related to local approach in Fatigue engineering.

Coffin manson characterizes the plastic area (equivalent of low cycle fatigue)

Other parameters are related to Ramberg-Osgood cycle hardening/softening material curve

PhV

 

[MToft]

Hi,
As I found Bannantine quite hard to get hold of, here's my take on these parameters:

A strain-life curve is basically made up of two log-log straight curves for the elastic and plastic strains;

elastic coefficient = fatigue strength coefficient
elastic exponent = " " (Basquin) exponent
plastic coefficient = " ductility coefficient
plastic exponent = " " (Coffin-Manson) exponent

Basquin between -0.05 and -0.12 for some typical steels, Coffin-Manson from -0.5 to -0.7?

Safe Technology of Sheffield, UK have provided some good advice, courses etc in the past...

Good luck!

 

[jagad5]

Try looking for Bannanntine at

http://www.bookfinder.com

a website that checks hundreds of new and used bookstores. You can find just about any book you want and can compare prices from many places.

Doug

Doug