Hensel spittel or GMT graph from steel stress strain curve

[LCform]

Hi All

I would like to know , how can I extract the equation of flow curve based on the stress strain graph ( scanned ) that I have , using the formulations of Hensel spittel or GMT ?

 

[metengr]

You convert the scanned stress/strain curve into a true stress/strain curve. You can find this out by searching.

 

[LCform]

Thank you , what I have is a force-displacement, sorry for briefing , yes, but after converting to true stress strain curve , how do I get the appropriate (estimated ) equation and it's coefficients ?

 

[metengr]

Search the flow curve equation and using the true stress/strain curve, you can determine the coefficients.

http://ocw.mit.edu/courses/material...chanics-of-materials-fall-1999/modules/ss.pdf