What is a good constitutive model for isotropic metals?

[crustaccione]

I am currently modelling the transverse compression of a gold fibre using FEA software, and I was wondering what plasticity model would be good. I'm thinking of using Johnson-Cook's plasticity model, but I then have no idea where to get the necessary parameters. If there is no good model, where can I obtain the values for stress-strain curves?

Sorry if my post is vague, I'm extremely new in this field and could use some enlightening.

 

[Compositepro]

I'm not familiar with FEA modelling, but gold is completely ductile and does not work harden. So there will no difference between longitudinal and transverse properties. The stress/strain curve should be all you need.

 

[crustaccione]

Yeah that's what I was thinking since gold is isotropic, but at some point in my compression modelling it is bound to experience plastic deformation so I was wondering if there is any way to model that.

Is there any catalog out there which has stress-strain data for materials? I found Boyer's Atlas of Stress-Strain Curves, but it fortunately does not have the data for gold.

 

[Compositepro]

Google seems to be able to find a whole bunch of them.

 

[crustaccione]

I've found stress-strain curves, but I would need specific values for gold in order to input them into my model. Did you happen to come across a specific one for gold?

 

[Compositepro]

What were your search terms? Did they include "gold"?

 

[crustaccione]

yeah i looked for "gold stress-strain curves", "gold stress-strain data", "gold tensile stress-strain". Most of the results that came up were for gold film (which I could theoretically use, but the mechanical properties may differ slightly), or gold fibers embedded in other materials and structures for reinforcement.

What did you find, may I ask?