3. Operands

The command allows the calculation of the complement of internal forces due to non-linearities in behavior. This calculation concerns laws of behavior where internal forces depend essentially on kinematic fields (displacements, velocities, accelerations); it therefore mainly concerns localized nonlinearities such as, for example, penalized contact between discrete elements. The terms calculated at the nodes are obtained by the difference between the integrated residual of internal forces (depending on both the kinematic fields and the parameters of the law of behavior) and the internal force that would be obtained from the same kinematic fields by considering linear behavior for the structure.

Note 1:

The name of the created result concept of type dyna_trans is necessarily different from the name of the concept result of type dyna_trans used as input under the operand RESULTATet constitutes an evolution of fields of type “DEPL “.This new result of complementary nodal forces is used under the keyword EXCIT_RESU * ** in the command DYNA_VIBRA with TYPE_RESU =” HARM” (in this case after transformation by the operator REST_SPEC_TEMP [U4.63.34]) and DYNA_LINE_TRAN or DYNA_VIBRA and TYPE_RESU =” TRAN “). An example is provided in test case SDLS119A.

Note 2:

In the specific case of the calculation with the relationship “ DIS_CHOC “assigned to discrete elements, It is then necessary to always orient the discrete contact element in the direction of structure towards the stop. Whether with elements POI1, as always with the keyword ORIENTATIONde AFFE_CARA_ELEM, but also with elements SEG2où, we must clearly define the element in the sense of structure candidate for contact, associated with node 1, towards the stop, associated with node 2.

Operands TOUT_ORDRE/NUME_ORDRE/LIST_ORDRE/NUME_MODE//NOEUD_CMP///NOM_CAS/INST//LIST_INST/FREQ/purpose LIST_FREQ PRECISION CRITERE ——————————————– ⸺

See [U4.71.00] for a description of these operands.

3.1. Operand MODELE

♦ MODELE = me,

Model name, required to enter

3.2. Operand CHAM_MATER

◊ CHAM_MATER = to kill,

The name of the material field where the material characteristics of the elements are defined. This argument is necessary for the calculation because the laws of behavior defined in the COMPORTEMENT keywords always require a material field.

3.3. Operand CARA_ELEM

◊ CARA_ELEM = character,

The concept of elementary characteristics of the cara_elem type is necessary for the calculation if it exists in the model of structural elements.

3.4. Operand COMPORTEMENT

◊ COMPORTEMENT = _F

Keyword factor that allows you to assign laws of behavior to cells or groups of cells in the mesh.

We define an assignment per occurrence of the COMPORTEMENT keyword.

3.4.1. Operand RELATION

◊ RELATION,

Name of a law of behavior relationship in text format. The relationships allowed are those where the internal forces depend essentially on kinematic fields (displacements, velocities, accelerations); in addition to the “ELAS” relationship, the first expected relationship is the “DIS_CHOC” relationship assigned to discrete elements.

3.4.2. Operand DEFORMATION

◊ DEFORMATION,

Name of the type of deformation in text format compatible with the type of elements affected by the law of behavior.

3.4.3. Operands TOUT/GROUP_MA/MAILLE

◊ TOUT = “OUI”,

The relationship is affected throughout the mesh.

◊ GROUP_MA = lgma,

The relationship is affected on the mesh groups contained in the lgma list.

◊ MAILLE = LMA,

The relationship is affected on the cells contained in the lma list.