SOL 401 Multi-Step Nonlinear

SOL 401 Multi-Step Nonlinear is a structural analysis solution that supports large displacements, large rotations, and nonlinear materials including plasticity and creep. SOL 401 is the structural solution used by the Simcenter 3D Multiphysics environment.

At the subcase level, SOL 401 supports the following analysis types. You can define a combination of these analysis types within the same solution.

• Nonlinear static analysis

• Normal modes, cyclic modes, and Fourier normal modes

• Bolt preload

Nonlinear control parameters

You can define any of the SOL 401 nonlinear control parameters at the global and at the subcase levels.

Geometric nonlinear effects

In addition to material nonlinearities, SOL 401 supports small strains, large displacements, and large rotations. SOL 401 does not support large strains.

The material and geometric nonlinearity parameters are global for all subcases.

Boundary conditions

SOL 401 supports the following boundary conditions:

• Loads — Mechanical (force, moment, gravity, pressure, bolt preload, acceleration, enforced motion) and thermal (time independent or dependent, or external from another solution)

• Constraints — Single-point constraints and multi-point constraints

• Simulation objects — Surface-to-surface and edge-to-edge contact and gluing, cyclic symmetry, protective layers (thermal barrier coating), material override, report (displacement tracking)Note: For information on adding thermal barrier coatings, see Protective Layers.

Elements

SOL 401 supports the following elements:

• 0D elements: CELAS1, CELAS2, CMASS1, CMASS2

• 1D elements: CBAR, CBEAM

• 2D elementsShell elements: CQUAD4, CQUAD8,CTRIA3, CTRIA6 (SOL 401 treats the CQUAD4 and CTRIA3 elements as CQUADR and CTRIAR elements)Plate elements: CQUADR, CTRIAR2D Plane Strain elements: CPLSTN3, CPLSTN4, CPLSTN6, CPLSTN82D Plane Stress elements: CPLSTS3, CPLSTS4, CPLSTS6, CPLSTS8

• 3D elementsCHEXA, CPYRAM, CTETRA, CPENTA3D Axisymmetric elements: CTRAX3, CTRAX6, CQUADX4, CQUADX83D Cohesive elements: CHEXCZ, CPENTCZ3D Chocking elements: CCHOCK3, CCHOCK4, CCHOCK6, CCHOCK83D Rigid elements: RBAR, RBE2, RBE3

• Special element types: CBUSH, CONM1, CONM2, CBUSH1D

Materials

SOL 401 supports the following material behaviors (with optional temperature dependencies):

• Isotropic

• Orthotropic

• Anisotropic

• Creep

• Ply failure

• Material for cohesive elements

Solution 401 supports externally computed, user defined material models (UMAT).

Subcase sequencing and timesteps

SOL 401 supports sequentially dependent (SEQDEP) subcases. Sequential dependency causes a subcase to use the end time from the previous subcase as its start time, and to use the end state (displacement, stress, and strain) as its starting state. You can set sequential dependency globally, or you can set individual subcases to be sequentially dependent.

If your analysis includes modal subcases that are sequentially dependent to nonlinear subcases, you can control how the computed contact stiffness in the nonlinear subcase is applied to the sequentially dependent modal subcase. For more information, see Tangential Contact Stiffness in Linear Perturbation Subcase (KMODTN) in Nonlinear Control Parameters dialog box (Simcenter Nastran SOL 401/Simcenter 3D Multiphysics).

For more information on SOL 401, see Simcenter Nastran Multi-Step Nonlinear User’s Guide (SOL 401 and SOL 402).

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed partSimcenter Nastran as the specified solverStructural as the specified analysis type
Command Finder	Solution
Simulation Navigator	Right-click the Simulation file→New Solution
Location in dialog box	Solution dialog box→Solution Type list

Learn more

SOL 401 Multi-Step Nonlinear workflow

SOL 402 Multi-Step Nonlinear Kinematics

SOL 402 Multi-Step Nonlinear Kinematics workflow

Modeling thermal strain

Controlling plasticity and creep effects

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

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SOL 401 Multi-Step Nonlinear, Simcenter 3D 2021.1 Series

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