# LinearThermalExpansibility¶

Type: 2-Tensor, or section [v_1, …, v_9] -/- optional

Sets the linear thermal expansion coefficient is the fractional change of length of an infinitesimal small body per degree of temperature change, that is

Units are . Since the length changes may be anisotropic the thermal expansion coefficient is a rank-2 tensor.

A constant linear thermal expansion coefficient can be defined by assigning a rank-2 tensor:

Material {
# defines a constant conductivity
LinearThermalExpansibility =
[..., ..., ...
..., ..., ...
..., ..., ...]
}


Assign a scalar for an isotropic thermal expansibility.

For more general cases, the thermal expansibility may be given as a section in order to deal with space, time, and parameter dependent definitions:

# define the density as a section
LinearThermalExpansibility {
Python {...}
...
}


Field definitions within the section LinearThermalExpansibility are summed up. Consult the subsequent sections to see which types of field definitions are allowed.