Initial stress/strain

You can use the Initial Stress/Strain command to define a stress or strain tensor field that represents the mechanical internal load effects that exist prior to the start of a solve. For example, you can import the strains computed from a previous solution as a field, and use that as the starting point for your new solution.

Balanced strain

You can include residual stress and initial inelastic strain that does not cause deformation by generating balanced strains. Balanced stresses and strains represent pre-existing stresses in the component as modeled.

To simulate the balanced strains, you create a separate solution of type SOL 401 Balanced Strain Generation (Simcenter Nastran) or Balanced Strain Generation (Multiphysics). In that solution, you define unbalanced stresses and strains on a model with no constraints and no other loads. From that solution, you create an offset strain field that you can apply to a balanced Initial Stress/Strain load in a SOL 401 Multi-Step Nonlinear (Simcenter Nastran) or Multi-Step Nonlinear (Multiphysics) solution.

Corresponding Nastran Syntax

The Initial Stress/Strain command corresponds to the Simcenter Nastran INITS bulk entry.

Where do I find it?

Application	Pre/Post
Prerequisite	A Simulation file as the work part and displayed part Simcenter Nastran or Simcenter 3D Multiphysics as the specified solverStructural or Coupled as the specified analysis typeSOL 401 Multi-Step Nonlinear (Simcenter Nastran), SOL 401 Balanced Strain Generation (Simcenter Nastran), or Multi-Step Nonlinear (Multiphysics), or Balanced Strain Generation (Multiphysics) as the specified solution
Command Finder	Initial Stress/Strain

How do I

Define an initial stress or strain

Quick links

Command reference

Pre/Post video examples

Bulk Entry Descriptions

Simcenter 3D tutorials

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Initial stress/strain, Simcenter 3D 2021.1 Series

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