4.1 Linear Elasticity

The material properties to be input for linear elasticity are:

Young's modulus

E , always necessary.

Poisson's ratio

$\nu$ , necessary for two- and three-dimensional elements.

Shear modulus

G , necessary for orthotropic elasticity and optional for cross-section elements.

Thermal expansion coefficient

$\alpha$ , necessary to determine temperature load.

Concentration expansion coefficient

$\gamma$ , necessary to determine concentration load.

The next two sections outline the input syntax for isotropic and orthotropic material respectively. Spring and interface elements require special input of linear elasticity, see §9.1 and §9.3 respectively.