Hi,

I'm trying to model a viscoelastic material. A convenient way of doing this seems to be to input a relaxation curve and let SW calculate the various constants. So, as I understand it I should input a curve of relaxation modulus vs. time as shown below:

The rest of the material inputs look like this:

On reflection though, I'm not sure about some things.

The graph I pasted is for room temperature however SW doesn't ask for temperature. Does it make an assumption that the graph for data at a certain temperature?

I assume that I only have to provide a graph of either shear or bulk relaxation as the two should be related, is that right?

Have I completely misunderstood what I should be inputting?

Hi Eric,

You can enter both relaxation curves through the corresponding time curves under the Tables&Curves.

If Temperature effects are to be considered, Glass transition Temperature and the two material constants must be specified.

Hope this helps.

Mohamed.