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*HYPERFOAM

Keyword type: model definition, material

This option is used to define a hyperfoam material. There is one optional parameters, N. N determines the order of the strain energy potential. Default is N=1. All constants may be temperature dependent.

The hyperfoam strain energy potential takes the form

\begin{displaymath}
U=\sum_{i=1}^{N} \frac{2 \mu_i}{\alpha_i^2} \left[ \lambda_1...
...^{\alpha_i}-3+\frac{1}{\beta}(J^{-\alpha_i \beta_i}-1) \right]
\end{displaymath} (24)

where $\lambda_1$, $\lambda_2$ and $\lambda_3$ are the principal stretches.


First line:

Following line for N=1:

Repeat this line if needed to define complete temperature dependence.

Following line for N=2:

Repeat this line if needed to define complete temperature dependence.

Following lines, in a pair, for N=3: First line of pair:

Second line of pair: Repeat this pair if needed to define complete temperature dependence.

Example:

*HYPERFOAM,N=2
0.164861,8.88413,2.302e-5,-4.81798,0.,0.

defines a hyperfoam material with two terms in the series.


Example files: beamhf.


next up previous contents
Next: *INCLUDE Up: Input deck format Previous: *HYPERELASTIC   Contents
Guido Dhondt 2003-08-06