Initial Stress and Strain
You can add the Initial Stress and Strain subnode to the Linear Elastic Material or Layered Linear Elastic Material, in order to specify the stress or strain state in the structure before applying any constraint or load. The values given are not initial values in the mathematical sense but rather a contribution to the constitutive relation
In many cases Initial Stress and Strain and External Stress are interchangeable when prescribing stresses, but you can find some more options in the latter.
Layer Selection
This section is only present when this node is added under Layered Linear Elastic Material node. In this section, select the layers in which initial stress and strain needs to be modeled.
For a general description of this section, see Layer Selections in the documentation for the Composite Materials Module.
Coordinate System Selection
The given initial stresses and strains are interpreted in this system.
The Shell local system is selected by default. This means that the orientations are the same as used for the material description.
If you select Projected from coordinate system, you can select any coordinate system present in the model. The Coordinate system list will then contain any coordinate system present in the model. The coordinate system given is projected onto the shell surface as described in Local Coordinate Systems.
Initial Stress
Specify the initial stress as the Initial in-plane force, the Initial moment, and the Initial out-of-plane shear force. Enter values or expressions in the applicable fields for the:
Initial Strain
Specify the initial strain as the Initial membrane strain, the Initial bending strain, and the Initial transverse shear strain. Enter values or expressions in the applicable fields for the:
Location in User Interface
Context Menus
Shell>Linear Elastic Material>Initial Stress and Strain
Shell>Layered Linear Elastic Material>Initial Stress and Strain
Plate>Linear Elastic Material>Initial Stress and Strain
Ribbon
Physics tab with Linear Elastic Material or Layered Linear Elastic Material node selected in the model tree:
Attributes>Initial Stress and Strain