/IMPL/NONLIN
Engine Keyword Nonlinear implicit methods.
Format
/IMPL/NONLIN/N
L_A Itol Toli Tolj Tolk
Definitions
Data | Description | SI Unit Example |
---|---|---|
N | Nonlinear solver method.
|
|
L_A | Maximum iteration
number of stiffness matrix updates.
|
|
Itol | Termination criteria.
|
|
Toli ... Tolj ... Tolk | When
(Itol = 1,
2, 3), tolerance for
termination. Toli
When (Itol = 12, 13, 23) two tolerances for termination. Toli
Tolj
When (Itol = 123) three tolerances for termination. Toli
Tolj
Tolk
|
Comments
- For static implicit computation, the loading should be defined as monotonous, increasing time function to better manage the convergence.
- Order of input tolerance is
according to the Itol value with 1: energy;
2: force; and 3: displacement.
Example: Itol = 23, the order is Tolerance in force and Tolerance in displacement.