3D Connexion Version 6.6

*STATIC

by ABAQUS is not suitable. This parameter must be used in conjunction with the STABILIZE

parameter and overrides the automatic calculation of the damping factor based on a value of the

dissipated energy fraction.

This parameter cannot be used if the RIKS parameter is included.

FULLY PLASTIC

This parameter isrelevant only for cases where “fully plastic” analysis is required with deformation

theory plasticity. For that purpose set this parameter equal to the name of the element set being

monitored for fully plastic behavior.

The step willend when the solutions at all constitutive calculation points in the element set are

fully plastic (deﬁned by the equivalent strain being 10 times the offset yield strain). The step will

end before this occurs if either the maximum number of increments given on the *STEP option or

the time period given on the data line of *STATICis exceeded.

LONG TERM

Include this parameter to obtain the fully relaxed long-term elastic solution with time-domain

viscoelasticity or the long-term elastic-plastic solutionfor two-layer viscoplasticity. Ifthe LONG

TERM parameter is omitted, the instantaneous elastic solution is obtained for time-domain

viscoelasticity and the combined response of the elastic-plastic and elastic-viscous ne tworks is

obtained for two-layer viscoplasticity.The parameter is relevant only for time-domain viscoelastic

and two-layer viscoplastic materials.

RIKS

Include this parameter to use the modiﬁed Riks method fo r proportional loading cases (“Unstable

collapse and postbucklinganalysis,” Section 6.2.4 of the ABAQUS Analysis User’s Manual).

STABILIZE

Include this parameter to use automatic stabilization if the proble m is expected to be unstable due

to local instabilities. Set this parameter equal to the dissipated energy fraction ofthe automatic

damping algorithm (see “Solving nonlinear problems,” S ection 7.1.1 of the ABAQUS Analysis

User’s Manual). If this parameter is omitted, the stabilization algorithm is not activated. If this

parameter is included without a speciﬁed value, the defaultvalue of the dissipated energy fraction

is . If the FACTOR parameter is used, any value of the dissipated energyfraction will be

overridden by the damping factor.

This parameter cannot be used if the RIKS parameter is included.

Data line for a general static analysis:

First (and only) line:

1. Initialt ime increment. This value will be modiﬁed a s required if the automatic time stepping

scheme is used orwill be used as the constant time increment if the DIRECT parameter is used.

If this entry is zero or is not speciﬁed, a defaultvalue that is equal to the total time period of

the step is assumed.

2. Timeperiod of the step. Ifthis entry is zero or is not speciﬁed, a default valu e of isassumed.

18.31–2

ABAQUS Version 6.1 Module: ID:

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