Initial Stress and Strain
You can add the Initial Stress and Strain subnode to the 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.
For details about initial stresses and strains, see Initial Stresses and Strains.
Shell Properties
Select the layer or layers for which this stress or strain contribution is to be added.
Table 6-16: Layer Selections; Initial Stress and Strain.
Selection
Use All Layers
Selection of Individual Layers
Boundary
Same as parent selection when the node is added.
When Use all layers is not selected.
Only a subset of the layers selected in the parent can be selected.
If the initial stress or strain differ between layers, you will need to add several Initial Stress and Strain nodes with different layer selections.
If the same layer is selected in two Initial Stress and Strain nodes being active on the same boundary, the contributions will be added.
Coordinate System Selection
The Coordinate system list contains all applicable coordinate systems in the model, including the Boundary system and the Layer local system. The Global coordinate system is selected by default. Initial stresses and strains are specified along the axes of the selected coordinate system.
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See Defining a Layer Local System in the Composite Materials Modeling chapter.
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All other settings are described in the documentation for Initial Stress and Strain in the Solid Mechanics interface.
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For a general description of layer and interface selections, see The Shell Properties and Interface Selection Sections.
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You can describe stress or strain values with a through-thickness variation by explicitly or implicitly using expressions containing the extra dimension coordinate as described in Using the Extra Dimension Coordinates.
Location in User Interface
Context Menus
Layered Shell > Linear Elastic Material > Initial Stress and Strain
Ribbon
Physics tab with Linear Elastic Material node selected in the model tree:
Attributes > Initial Stress and Strain