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*EXPANSION

Keyword type: model definition, material

This option is used to define the thermal expansion coefficients of a material. They are interpreted as total expansion coefficients with respect to a reference temperature , i.e. the thermal strain of a material at a final temperature T and with initial temperature is determined by

| (191)

where is the thermal coefficient at a temperature T. There are two optional parameters TYPE and ZERO. Default for TYPE is TYPE=ISO, other values are TYPE=ORTHO for orthotropic materials and TYPE=ANISO for anisotropic materials. All constants may be temperature dependent. The parameter ZERO is used to determine the reference temperature, default is 0.

First line:

- *EXPANSION
- Enter the TYPE and ZERO parameters and their values, if needed

Following line for TYPE=ISO:

- .
- Temperature.

Repeat this line if needed to define complete temperature dependence.

Following line for TYPE=ORTHO:

- .
- .
- .
- Temperature.

Repeat this line if needed to define complete temperature dependence.

Following line for TYPE=ANISO:

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

Repeat this line if needed to define complete temperature dependence.

    Example:

    *EXPANSION,ZERO=273.
    12.E-6,373.
    20.E-6,573.

tells you that the thermal strain in a body made of this material is if heated from T=273 to T=373, and if heated from T=273 to T=573.

Example files: beamt, beamt2.

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