1. Discretization

1.1. Degrees of freedom

Modeling

Degrees of freedom on each node

XXX_JOINT	DX: next move \(X\)
	DY: next move \(Y\)
3D_ JOINT	DX: Next move \(X\)
	DY: next move \(Y\)
	DZ: next move \(Z\)
XXX_ELDI	DX: next move \(X\)
	DY: next move \(Y\)

XXX_INTERFACE and XXX_INTERFACE_S	DX: next move \(X\) or SIGNmultiplicateur by Lagrange
	DY: next move \(Y\) or SITX: Lagrange multiplier
3D_ INTERFACE and 3D_ INTERFACE_S	DX: next move \(X\) or SIGNmultiplicateur by Lagrange
	DY: next move \(Y\) or SITX: Lagrange multiplier
	DZ: next move \(Z\) or SITY: Lagrange multiplier

For the location of displacement and Lagrange ddls for INTERFACE models, see doc R3.06.13.

1.2. Support mesh

The support meshes for finite elements are quadrangles, hexahedra or pentahedra. The elements are isoparametric for the degrees of freedom of movement.

Modeling	Mesh	Interpolation	Remarks
XXX_JOINT	QUAD4	linear
3D_ JOINT	HEXA8	linear
	PENTA6	linear
XXX_ELDI	QUAD4	linear
XXX_INTERFACE and XXX_INTERFACE_S	QUAD8	quadratic in motion linear in Lagrange	mixed formulation
3D_ INTERFACE and 3D_ INTERFACE_S	HEXA20	quadratic in motion linear in Lagrange	mixed formulation
	PENTA15	quadratic in motion linear in Lagrange	mixed formulation