Temperature dependent parameters

[DWeber]

Dear FEAP-Forum,

first of all: This is my very first question, I read the user manual, I asked my colleagues and I used the search function but did not find related topics. Thank you for any hint!

I am looking for a way to use temperature dependent young's modulus, poisson ratio, heat expansion coefficient and density in a coupled thermo-mechanical problem. Where can I find information about this?

I want to apply the temperatures directly to the nodes, without transient solution (We are using another program for the thermal conditions). Therefore I used the TEMP command of the mesh manual, but there is no thermal degree of freedom in the output file (Th. D.O.F.=0).

Thank you!

P.S.: I am using FEAP 8.4

[Prof. R.L. Taylor]

I assume at present you can solve the coupled problem but the properties are temperature independent.

At present we have not implemented any temperature dependent properties. Thus, you will need to write a user material model to do this.  Both the mechanical deformation measure and the temperature are passed to the model  as a parameter.  Look at any umatl*.f (in the ./user directory) for a template.  Since you are importing the temperatures from another program the problem is being solved in a "staggered" approach -- or in FEAP using partitions.  Thus, you should not need the linearization terms from the temperature dependent properties.

[DWeber]

Thank you!