bConverged

*EXPANSION

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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 $T_{ref}$ , i.e. the thermal strain $\epsilon_{th}$ of a material at a final temperature T and with initial temperature $T_{0}$ is determined by

$\displaystyle \epsilon_{th}=\alpha(T)(T-T_{ref})-\alpha(T_o)(T_o-T_{ref}),$

(154)

where $\alpha(T)$ 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:

$\alpha$ .
Temperature.

Repeat this line if needed to define complete temperature dependence.

Following line for TYPE=ORTHO:

$\alpha_{11}$ .
$\alpha_{22}$ .
$\alpha_{33}$ .
Temperature.

Repeat this line if needed to define complete temperature dependence.

Following line for TYPE=ANISO:

$\alpha_{11}$ .
$\alpha_{22}$ .
$\alpha_{33}$ .
$\alpha_{12}$ .
$\alpha_{13}$ .
$\alpha_{23}$ .
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 $100. \times 12. \times 10^{-6}=12. \times 10^{-4}$ if heated from T=273 to T=373, and $300 \times 20 \times 10^{-6}=60 \times 10^{-4}$ if heated from T=273 to T=573.

Example files: beamt, beamt2.

Next: *FACE PRINT Up: Input deck format Previous: *EQUATION Contents

guido dhondt 2011-03-26