Code_Aster ®
Version
8.1
Titrate:
Modelings PLAN_JOINT, AXIS_JOINT, PLAN_ELDI and AXIS_ELDI
Date:
15/02/06
Author (S):
J. LAVERNE, F. LEBOUVIER Key
:
U3.13.14-C Page
: 1/4

Organization (S): EDF-R & D/AMA, DeltaCAD
Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
Document: U3.13.14

Modelings PLAN_JOINT, AXIS_JOINT,
PLAN_ELDI and AXIS_ELDI

Summary:

This document describes for modelings PLAN_JOINT, AXIS_JOINT, PLAN_ELDI and AXIS_ELDI:

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

Modelings PLAN_JOINT and AXIS_JOINT (Phénomène: MECANIQUE) correspond to elements
stop of joint, they are QUAD4 degenerated into SEG2 modelling the lips of a fissure. Such elements
stop can support the laws of behavior CZM_EXP_REG (law of cohesive forces of Barenblatt type:
to see Doc. [R7.02.11]) and JOINT_BA.
Modelings PLAN_ELDI and AXIS_ELDI (Phénomène: MECANIQUE) correspond to elements with
internal discontinuity, they are voluminal elements (QUAD4) crossed by a discontinuity. It allow
also to model the opening of a fissure. Such finite elements can support only one law of
behavior: CZM_EXP (law of cohesive forces of Barenblatt type: to see Doc. [R7.02.12]).

Thereafter, symbol XXX corresponds to “PLAN” or “AXIS”.
Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-62/06/004/A

Code_Aster ®
Version
8.1
Titrate:
Modelings PLAN_JOINT, AXIS_JOINT, PLAN_ELDI and AXIS_ELDI
Date:
15/02/06
Author (S):
J. LAVERNE, F. LEBOUVIER Key
:
U3.13.14-C Page
: 2/4

1 Discretization

1.1
Degrees of freedom

Modeling
Degrees of freedom (with each node node)

XXX_JOINT
DX: displacement following X

DY: displacement following Y
XXX_ELDI
DX: displacement following X

DY: displacement following Y

1.2
Net support of the matrices of rigidity

The meshs supports of the finite elements are quadrangles. The elements are isoparametric.

Modeling Nets Interpolation
Remarks

Linear XXX_JOINT QUAD4
Linear XXX_ELDI QUAD4

2 Possibilities
non-linear

2.1
Law of behaviors

Laws of behaviors specific to these modelings, usable under COMP_INCR in
STAT_NON_LINE and DYNA_NON_LINE are as follows (Cf. [U4.51.11]):

/“CZM_EXP_REG”
Supported modelings: PLAN_JOINT, AXIS_JOINT

/“CZM_EXP”
Supported modelings: PLAN_ELDI, AXIS_ELDI

/“JOINT_BA”
Supported modelings: PLAN_JOINT, AXIS_JOINT

2.2 Deformations

Only the linearized deformations key word “PETIT” under DEFORMATION are available in
relations of behavior (Cf. [U4.51.11]).
Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-62/06/004/A

Code_Aster ®
Version
8.1
Titrate:
Modelings PLAN_JOINT, AXIS_JOINT, PLAN_ELDI and AXIS_ELDI
Date:
15/02/06
Author (S):
J. LAVERNE, F. LEBOUVIER Key
:
U3.13.14-C Page
: 3/4

3
Examples of implementation: case-tests

·
PLAN_JOINT
­ Statique
non-linear
SSNP118A [V6.03.118]: Case-test of validation of the element joint plane 2D with a law of
behavior of the type CZM_EXP_RÉG.
SSNP128A [V6.03.128]: Validation of the element with internal discontinuity and law CZM_EXP
on a plane plate.
SSNP126A [V6.03.126]: Case-test of validation of the law of behavior JOINT_BA (connection
steel-concrete) with an element of joint plane 2D.

·
AXIS_JOINT
­ Statique
non-linear
SSNA112A [V6.01.112]: Test of wrenching carried out by Borderie & Pijaudier - Cabot
for the study of the steel-concrete connection with the law of behavior JOINT_BA.
SSNA115A [V6.01.115]
: Wrenching of a rigid reinforcement with elements with
discontinuity.

Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-62/06/004/A

Code_Aster ®
Version
8.1
Titrate:
Modelings PLAN_JOINT, AXIS_JOINT, PLAN_ELDI and AXIS_ELDI
Date:
15/02/06
Author (S):
J. LAVERNE, F. LEBOUVIER Key
:
U3.13.14-C Page
: 4/4

Intentionally white left page.

Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-62/06/004/A

Outline document