Keyword type: model definition, material
This option is used to define the elastic properties of a material. There is one optional parameter TYPE. Default is TYPE=ISO, other values are TYPE=ORTHO and TYPE=ENGINEERING CONSTANTS for orthotropic materials and TYPE=ANISO for anisotropic materials. All constants may be temperature dependent. For orthotropic and fully anisotropic materials, the coefficients satisfy the equation:
where is the second Piola-Kirchhoff stress and is the Lagrange deformation tensor (nine terms on the right hand side for each equation). For linear calculations, these reduce to the generic stress and strain tensors.
An isotropic material can be defined as an anisotropic material by defining , and , where and are the Lamé constants .
Following line for TYPE=ISO:
Following lines, in a pair, for TYPE=ORTHO: First line of pair:
Following lines, in a pair, for TYPE=ENGINEERING CONSTANTS: First line of pair:
Following lines, in sets of 3, for TYPE=ANISO: First line of set:
Example: *ELASTIC,TYPE=ORTHO 500000.,157200.,400000.,157200.,157200.,300000.,126200.,126200., 126200.,294.
defines an orthotropic material for temperature T=294. Since the definition includes values for only one temperature, they are valid for all temperatures.
Example files: aniso, beampo1.