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NLADAPT |
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NLADAPT |
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NLADAPT |
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NLADAPT |
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Bulk Data Entry
NLADAPT – Parameters for Nonlinear Analysis to define time-stepping and convergence criteria
The NLADAPT bulk data entry defines parameters for time-stepping and convergence criteria in Nonlinear Analysis.
Format
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NLADAPT |
ID |
PARAM1 |
VALUE1 |
PARAM2 |
VALUE2 |
PARAM3 |
VALUE3 |
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PARAM4 |
VALUE4 |
PARAM5 |
VALUE5 |
PARAM6 |
VALUE6 |
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Field |
Contents |
ID |
Each NLADAPT Bulk Data Entry should have a unique ID. No default (Integer > 0) |
NCUTS |
Number of cutbacks allowed to reduce the time increment. Default = 5 (Integer > 0) |
DTMAX |
Maximum time increment allowed. No default (Real > 0.0) |
DTMIN |
Minimum time increment allowed. No default (Real > 0.0) |
NOPCL |
Number of grids allowed to have open-close contact status change. (Integer ≥ 0) |
NSTSL |
Number of grids allowed to have stick-slip contact status change when the current time step converged. No default (Integer ≥ 0) |
EXTRA |
LINEAR: Activates linear extrapolation in the Newton-Raphson method. The displacement value from the previous load increment is used as the initial guess for the current load increment. NO: Extrapolation is turned off. Default = NO (LINEAR or NO) |
DIRECT |
NO: Adopt adaptive time increment scheme. Cutback is triggered if the time increment does not converge and none of the stopping criteria are satisfied. YES: Adopt fixed time increment. In case of divergence, the run will stop immediately. Default = NO (YES or NO) |
| 1. | The NLADAPT Bulk Data Entry is selected by the Subcase Information Entry NLADAPT=ID. The NLADAPT Subcase Entry can be specified in any Nonlinear Subcase. |
| 2. | All parameters, except NOPCL, on the NLADAPT Bulk Data Entry are applicable only to Large Displacement Nonlinear Quasi-static Analysis and Nonlinear Direct Transient Analysis. NOPCL can be used in Nonlinear Small Displacement Quasi-stati Nonlinear Analysis. |
| 3. | Parameters other than NOPCL are ignored for Small Displacement Nonlinear Analysis. |
See Also:
