[scilab-Users] Re: Function fit_data with several curves dependent on parameters

[Carrico, Paul]

In Johnson-Cook law, we speak about "Strain rate = epsilon_dot" and not about speed !!!!!

Typically used in Impact items (explicit solver) to take into account the material feature changes depending on the strain rate (different from a static test) !!!!!

Paul


-----Message d'origine-----
De : Orbeman [mailto:ludo.wag at laposte.net] 
Envoyé : mardi 7 juin 2011 15:16
À : users at lists.scilab.org
Objet : [scilab-Users] Re: Function fit_data with several curves dependent on parameters

It's not really simple.

The analytic law is y=(A+B*x^n)(1+C*ln(v/0.0001)), named Johnson-Cook
(stress/plastic strain).

The unknow parameters are A,B,n and C.

I've several curbes obtained with different speed (v) : curve 1 with
v=v1,..., curve i with v=vi (vi<>vj).

In future, I envisage to complexify the law with temperature with the factor
(1-((T-Tt)/(Tm-Tt))^m) and the unknow parameter m.

Thank you !



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