Could someone clarify me how to define a Ramberg–Osgood material in Mecway or give me some useful link?

The thing is that in literature and online spreadsheets (e.g. https://mechanicalc.com/reference/mechanical-properties-of-materials; engineerstoolkit.com/etk_material_curves_20121018.xls) that i have found the R-O equation looks a bit differently.

In Mecway i have to define material exponents

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## Comments

You do have to define E, but that's on the

Mechanicaltab of the material properties window.Exponent n stays the same and alpha is calculated only for yield stress as 0,002* Young's modulus/ Yield strength.

Another formula is:

e = s/E + (s/K)^n (s: sigma; e: epsilon)

For generalized law you need 3 constants: alfa, s0 and the exponent n. (plus E)

Obviously there is a relations:

K=(E/alfa+s0^n-1)^1/n could be sempificated

You need at least two constants for defining the law n, K (plus E) These constants are obtained experimentally (alfa and s0 could be condensed on K). I divided constant n, K from E because the exprerimental procedure to obtain n and K are different from the tensile test

See your spreadsheet modified

Regards