Time dependent material property

[redwanamit034]

I am quite new in abaqus.

Can you tell me how can I define a material whose properties will vary with time?

The materials property is dependent porosity.

I have data for change in porosity with time.
Now the conductivity,density will change with porosity.

How can I do that?

Please help

 

[redwanamit034]

One more thing. The property will vary with temperature as well.
I defined that change of conductivity,density with temperature.

But i don't know how can i define the change of material property with time as well