The Linear Elastic Material node adds the equations for a linear elastic solid and an interface for defining the elastic material properties.
By adding the following subnode to the Linear Elastic Material node you can incorporate damping effects; see
Damping.
The Global coordinate system is selected by default. The
Coordinate system list contains any additional coordinate systems that the model includes (except boundary coordinate systems). The coordinate system is used for interpreting directions of orthotropic and anisotropic material data and when stresses or strains are presented in a local system. The coordinate system must have orthonormal coordinate axes, and be defined in the material frame. Many of the possible subnodes inherit the coordinate system settings.
To use a mixed formulation by adding the pressure as an extra dependent variable to solve for, select the Nearly incompressible material check box. For a material with a very low compressibility, using only displacements as degrees of freedom may lead to a numerically ill-posed problem.
Define the Solid model and the linear elastic material properties.
The Solid model is always
Isotropic for a linear elastic material that has the same properties in all directions.
The default Density ρ uses values
From material. For
User defined enter another value or expression.
For an Isotropic Solid model, from the
Specify list select a pair of elastic properties for an isotropic material—
Young’s modulus and Poisson’s ratio,
Young’s modulus and shear modulus,
Bulk modulus and shear modulus,
Lamé parameters, or
Pressure-wave and shear-wave speeds. For each pair of properties, select from the applicable list to use the value
From material or enter a
User defined value or expression.
According to Table 15-1, the elasticity matrix
D for isotropic materials is written in terms of Lamé parameters
λ and
μ,
