Initial Stress and Strain
You can add the Initial Stress and Strain to the Linear Elastic Material node, 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.
Initial Stress
Specify the initial stress as the:
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Initial axial force Ni.
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Initial bending moment Miz and for 3D models, Miy.
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For 3D models: Initial torsional moment Mix.
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For Timoshenko beam: Initial shear force Tiy and for 3D models, Tiz.
Initial Strain
Specify the initial strain as the:
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Initial axial strain eni.
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Initial curvature θsiz and for 3D models, and θsiy.
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For 3D models: Initial twist θsix.
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For Timoshenko beam: Initial shear strain γsiy and for 3D models, γsiz.
For details about initial stresses and strains, see Inelastic Strain Contributions and Initial Stresses and Strains.
Context Menus
 Beam>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