2. Operands#

2.1. Operands MODELE/CHAM_MATER/CARA_ELEM#

♦ MODELE = mo

Name of the model whose elements are the subject of mechanical calculation.

♦ CHAM_MATER = chmat

The name of the material field assigned to the mesh. Attention, all the meshes in the model must be associated with a material.

♦ CARA_ELEM = character

Name of the characteristics of the shell, beam, pipe, pipe, bar, bar, cable, and discrete elements affected on the mo model.

2.2. Operand DOUBLE_LAGRANGE#

This keyword allows you to say whether or not the user wants to split the multipliers of Lagrange used to define dualize the boundary conditions in the assembled matrix.

Concretely, splitting Lagrange multipliers makes it possible to use linear solvers in allowing no pivoting. By not duplicating the Lagrange, you can reduce the number of degrees of freedom of the problem (and therefore the size of the problem to be solved) but its use is limited to solvers MUMPS and Petsc.

Note that the two Lagrange multipliers associated with the relationship will be such as the first will be located before all the terms involved in the relationship and the second after, in the matrix assembly. This choice has the advantage of having an assembled matrix that takes up more space. weak but has the disadvantage of being able to make a singularity appear in the matrix. The numbering is in any case liable to be modified by the renumber of the solver external selected, this detail therefore remains purely technical.

2.3. Keyword EXCIT#

♦ EXCIT =

This keyword factor makes it possible to describe a load at each occurrence. It is necessary to provide the boundary conditions for the structure, possibly instant loads such as gravity as well as the kinematic links linked to the cables that have already been stressed by a previous call to CALC_PRECONT. In no case should you include the charging of the cable (s) that you want to tension by calling this macro-command, nor the loads related to the cable (s) declared inactive.

2.3.1. Operands CHARGE#

♦ CHARGE = chi

chi is the mechanical load specified in the \(i\) th occurrence of EXCIT.

2.4. Keyword COMPORTEMENT#

The syntax of this keyword common to the STAT_NON_LINE command is described in document [U4.51.11].

2.5. Keyword INCREMENT#

♦ INCREMENT =

Define the time intervals taken in the incremental method.

2.5.1. Operands LIST_INST#

♦ LIST_INST = /litpsr8, listr8

/litps, [list_inst]

♦ If LIST_INST = litpsr8 listr8

The calculation times are those defined in the litpsr8 concept by the operator DEFI_LIST_REEL [U4.34.01].

♦ If LIST_INST = litps [list_inst]

The calculation times are those defined in the litps concept by the operator DEFI_LIST_INST [U4.34.03].

Note:

In the case of adherent cables (ADHERENT =” OUI “in DEFI_CABLE_BP), m*even if the calculation is carried out with several time steps, only the last time step is stored in the result concept.*

During the cable tension process, moments are automatically generated in addition to those provided by the user. It is therefore quite normal to see appear in the calculation message file with STAT_NON_LINEà moments that the user did not specify. These moments are*also stored in the result concept.

2.5.2. Operands INST_INIT/INST_FIN#

◊ INST_INIT = instinct

The initial moment of the calculation (which is therefore not (re) calculated) must be designated by its value.

If this initial step is not specified, the defect is calculated as follows:

if an initial state is specified (operand ETAT_INIT) and if it defines a corresponding instant (by EVOL_NOLI or INST_ETAT_INIT) then the initial moment is that defined by the initial state,
if there is no initial state or if it does not define a corresponding moment (the fields are given in ETAT_INIT without specifying INST_ETAT_INIT), then we take the first moment from the list of moments litps (NUME_INST_INIT =0).

◊ INST_FIN = instfin

The final moment (last calculated step) is designated in the same way as the initial moment, except that it is not possible to refer to the moment of the initial state.

2.5.3. Operand PRECISION#

◊ PRECISION = prec

2.6. Keyword CABLE_BP#

♦ CABLE_BP = cabl_pr

This is to provide a list of cabl_precont concepts produced by the operator DEFI_CABLE_BP [U4.42.04]. All the cables concerned will be stretched at the end of this calculation.

2.7. Keyword CABLE_BP_INACTIF#

◊ CABLE_BP_INACTIF = cabl_pr

This is to provide a list of cabl_precont concepts produced by the operator DEFI_CABLE_BP [U4.42.04]. The macro-command is responsible for generating the kinematic links linked to these inactive cables, and does not take into account the stiffness of these cables.

2.8. Keyword METHODE#

◊ METHODE =/NEWTON, [DEFAUT]

/IMPLEX,

This keyword defines the method of solving the problem. By default, Newton’s exact iterative method is used. If the user wants, they can use the robust but approachable IMPLEX method.

2.9. Keyword NEWTON#

The syntax of this keyword common to the STAT_NON_LINE command is described in document [U4.51.03]. It can only be used if the requested method is NEWTON.