# Discussion Forum

## Multi-linear isotropic hardening

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Alberto Torres

June 17, 2013 8:01pm UTC

Multi-linear isotropic hardening

Hi!

I'm working on a thermo-mechanical model (including plasticity) and I am defining a hardening function by an interpolation function because I have the stress-strain curve.

The problem is that I have many stress-strain curves, because this curve is dependent on the temperature (I have all stress-strain curves for various temperatures).

My question is, how I can define multiple curves (stress-strain) in my hardening function? A first solution that I tried, was using a temperature-dependent function that multiply one of stress-strain curve (20 ° C):

hardening * F (T)

but I want to know if it is possible to do adding all the experimental data.

Thanks and best regards!

Alberto T

Nagi Elabbasi
Certified Consultant
Veryst Engineering

June 19, 2013 4:30pm UTC in response to Alberto Torres

Re: Multi-linear isotropic hardening

Hi Alberto,

I believe you can define an Interpolation Function, set the Data Source field to File and reference a text file with the experimental data formatted according to the COMSOL format required for this feature (and described in the documentation).

Nagi Elabbasi
Veryst Engineering

Alberto Torres

June 19, 2013 4:43pm UTC in response to Nagi Elabbasi

Re: Multi-linear isotropic hardening

Thanks Nagi!

done!!

Best regards!

Alberto T

Massab Junaid

April 26, 2016 5:50am UTC in response to Nagi Elabbasi

Re: Multi-linear isotropic hardening

Hi,

I have solving a similar problem. When we choose the interpolation function to input the values of yield stress, we also have to define the values for kinematic tangent modulus and isotropic tangent modulus. I know the value of kinematic mod, what value should i use for the isotropic modulus.?

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