Controlling plasticity and creep effects

To include plasticity and creep effects in the solution, select the Material Nonlinearity check box in the Solution dialog box:

• When this check box is selected, creep and plasticity are included in the solve for all subcases.To disable creep or plasticity for individual subcases, create a Nonlinear Control Parameters modeling object that disables the creep or plasticity, and apply that modeling object to the desired subcases. For example, you might want to disable creep and plasticity for bolt preload/assembly subcases to save computation time.

• When this check box is cleared, plasticity and creep are not included in the solve regardless of creep and plasticity settings in the Nonlinear Control Parameters modeling object.

Note:

For SOL 401 and Multi-Step Nonlinear (Multiphysics), to disable the creep and plasticity effects for individual elements or for physical property tables, include a Material Override simulation object in the solution.

Corresponding Nastran syntax

The Material Nonlinearity option for the solution corresponds to the Simcenter Nastran MATNL parameter.

The Nonlinear Control Parameters for creep and plasticity correspond to the Simcenter Nastran CREEP and PLASTIC parameters on the NLCNTL bulk entry (SOL 401 and Multi-Step Nonlinear (Multiphysics)) and the NLCNTL2 bulk entry (SOL 402).

The Material Override simulation object corresponds to the Simcenter Nastran MATOVR bulk entry.

Visualizing the number of plastified and creep elements

For SOL 402, you can view the evolution of plastified and creep elements during an analysis on the Number of Plastified Elements and Number of Creep Elements graphs in the Solution Monitor. These curves are helpful when you want to know, for example, the total number of elements for which creep started, or how the number of creep elements changes as the solution converges.

Both graphs are always available in the Solution Monitor. To ensure that the Solution Monitor is available during the solve, see Disable or enable the Solution Monitor.

Where do I find it?

Setting material nonlinearity

Application	Pre/Post
Prerequisites	Simcenter Nastran or Simcenter 3D Multiphysics as the specified solverStructural or Coupled as the specified analysis typeSOL 401 Multi-Step Nonlinear (Simcenter Nastran), SOL 402 Multi-Step Nonlinear Kinematics (Simcenter Nastran), or Multi-Step Nonlinear (Multiphysics) as the specified solution type
Command finder	Solution
Simulation Navigator	Right-click the Simulation file→New Solution
Location in dialog box	SOL 401 Multi-Step Nonlinear (Simcenter Nastran)Solution dialog box→Bulk Data page→Material Nonlinearity check boxSOL 402 Multi-Step Nonlinear Kinematics (Simcenter Nastran)Solution dialog box→Parameters page→Material Nonlinearity check boxMulti-Step Nonlinear (Multiphysics)Solution dialog box→Solution Control page→Material Nonlinearity check box

Setting creep and plasticity effects in a Nonlinear Control Parameters modeling object

Application	Pre/Post
Prerequisites	Simcenter Nastran or Simcenter 3D Multiphysics as the specified solverStructural or Coupled as the specified analysis typeSOL 401 Multi-Step Nonlinear (Simcenter Nastran), SOL 402 Multi-Step Nonlinear Kinematics (Simcenter Nastran), or Multi-Step Nonlinear (Multiphysics) as the specified solution type
Command finder	Modeling Objects
Location in dialog box	SOL 401 Multi-Step Nonlinear (Simcenter Nastran) and Multi-Step Nonlinear (Multiphysics)Modeling Objects Manager dialog box→Type list→Nonlinear Control Parameters→Create→Plasticity and Creep Control pageSOL 402 Multi-Step Nonlinear Kinematics (Simcenter Nastran)Modeling Objects Manager dialog box→Type list→Nonlinear Control Parameters - Subcase→Create→Plasticity and Creep Control page

Creating a Material Override simulation object

Application	Pre/Post
Prerequisites	Simcenter Nastran or Simcenter 3D Multiphysics as the specified solverStructural or Coupled as the specified analysis typeSOL 401 Multi-Step Nonlinear (Simcenter Nastran), or Multi-Step Nonlinear (Multiphysics) as the specified solution type
Command finder	Material Override
Location in dialog box	Material Override dialog box→Plastic Effects or Creep Effects list

Learn more

SOL 401 Multi-Step Nonlinear

SOL 401 Multi-Step Nonlinear workflow

SOL 402 Multi-Step Nonlinear Kinematics

SOL 402 Multi-Step Nonlinear Kinematics workflow

Modeling thermal strain

Controlling the sequence of bolt pre-loads (SOL 401)

Element Add/Remove (SOL 401)

Simcenter Nastran SOL 401 Co-simulation with Simcenter STAR-CCM+

Complex modes analysis (SOL 402)

Displaying graphs in the Solution Monitor using the Report simulation object

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

Browse Simcenter 3D help by product area

Related Topics

Plasticity analysis

Creep analysis

Controlling plasticity and creep effects, Simcenter 3D 2021.1 Series

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