Code_Aster ®
Version
7.4
Titrate:
Modeling 3d_ABSO


Date:
01/06/05
Author (S):
G. DEVESA, F. LEBOUVIER Key
:
U3.14.09-C Page
: 1/2

Organization (S): EDF-R & D/AMA, DeltaCAD
Handbook of Utilization
U3.14 booklet: Mechanical finite elements 3D
Document: U3.14.09

Modeling 3d_ABSO

Summary:

This document describes for modeling 3d_ABSO:

· degrees of freedom carried by the finite elements which support modeling,
· the related meshs supports,
· supported loadings,
· nonlinear possibilities,
· case-tests implementing modelings.

Modeling 3d_ABSO (Phénomčne: MECANIQUE) corresponds to finite elements of which meshs
supports are surface. They make it possible to take into account the condition of absorbing border of volumes
solids.

Handbook of Utilization
U3.14 booklet: Mechanical finite elements 3D
HT-66/05/004/A

Code_Aster ®
Version
7.4
Titrate:
Modeling 3d_ABSO


Date:
01/06/05
Author (S):
G. DEVESA, F. LEBOUVIER Key
:
U3.14.09-C Page
: 2/2

1 Discretization

1.1
Degrees of freedom

Modeling
Degrees of freedom (with each node node)

3d_ABSO
DX: displacement following X

DY: displacement following Y

DZ: displacement following Z

1.2
Meshs supports of the matrices of rigidity

The meshs supports of the finite elements can be quadrangles or triangles. Elements
are isoparametric.

Modeling Nets Interpolation
Remarks

3d_ABSO TRIA3
linear
TRIA6
quadratic
QUAD4
linear
QUAD8
quadratic
QUAD9

1.3
Meshs supports of the loadings

The same ones as previously.

2 Loadings
supported

The loading available is as follows:

· “ONDE_PLANE”

Allows to impose a seismic loading by plane wave.

3 Possibilities
non-linear

3.1
Laws of behaviors

The only relation of behavior, available under DYNA_NON_LINE, for this modeling, under
COMP_INCR is relation “ELAS”.

3.2 Deformations

Only the linearized deformations key word “PETIT” under DEFORMATION are available.

4
Examples of implementation: case-tests

· Non-linear dynamics
SDLV120A [V2.04.120]: Analyze propagation of a wave of compression in a bar
infinite rubber band (absorption of the wave at the border of the grid).
SDLV121A [V2.04.121]: Propagation, reflection and absorption of a wave plane in a solid mass
modelled in the shape of a column 1D.
Handbook of Utilization
U3.14 booklet: Mechanical finite elements 3D
HT-66/05/004/A

Outline document