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URGENT - SOME FATIGUE CYCLING TERMS

URGENT - SOME FATIGUE CYCLING TERMS

URGENT - SOME FATIGUE CYCLING TERMS

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

RE: URGENT - SOME FATIGUE CYCLING TERMS

Look at the first coupld of chapters of this book

Fundamentals of Metal Fatigue Analysis

---bannantine

RE: URGENT - SOME FATIGUE CYCLING TERMS

(OP)
Thanks.

RE: URGENT - SOME FATIGUE CYCLING TERMS

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

RE: URGENT - SOME FATIGUE CYCLING TERMS

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!

RE: URGENT - SOME FATIGUE CYCLING TERMS

Try looking for Bannanntine at 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

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