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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

| (118)

where , and are the principal stretches. The parameters are related to the Poisson coefficients by:

| (119)

and

| (120)

First line:

- *HYPERFOAM
- Enter parameters and their values, if needed

Following line for N=1:

- .
- .
- .
- Temperature.

Repeat this line if needed to define complete temperature dependence.

Following line for N=2:

- .
- .
- .
- .
- .
- .
- Temperature.

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:

- .
- Temperature.

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.

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