NLPARM – Parameters for Nonlinear Static Analysis Control
Defines parameters for nonlinear static analysis iteration strategy.
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NLPARM |
ID |
NINC |
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MAXITER |
CONV |
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EPSU |
EPSP |
EPSW |
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(10) |
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NLPARM |
99 |
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Field |
Contents |
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ID |
Each NLPARM bulk data card must have a unique ID. No default (Integer > 0) |
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NINC |
Number of load sub-increments. See comment 3. Default = no increments (Integer > 0) |
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MAXITER |
Limit on number of nonlinear iterations. Default = 25 (Integer > 0) |
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CONV |
Flags to select convergence criteria. Default = UPW (Any combination of U, P and W) |
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EPSU |
Error tolerance for displacement (U) criterion. Default = 1.0E-3 (Real > 0.0) |
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EPSP |
Error tolerance for load (P) criterion. Default = 1.0E-3 (Real >0.0) |
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EPSW |
Error tolerance for work (W) criterion. Default = 1.0E-3 (Real >0.0) |
The NLPARM bulk data entry is selected by the Subcase Information command NLPARM = option. Each subcase for which nonlinear analysis is desired requires an NLPARM command.
The solution method is Newton (full version, i.e. with stiffness matrix update at each iteration).
If NINC is blank, the entire load for a given subcase is applied at once. NINC > 0 represents a number of equal subdivisions that the total load in a given subcase will be divided into. The Newton method will be applied to consecutive load levels until the final load is reached.
For more information about nonlinear analysis, see the Nonlinear Gap Analysis section.
Go To
Guidelines for Bulk Data Entries
Alphabetical List of Bulk Data Entries