Perform stress linearization

This procedure shows how to:

• Linearize the stresses acting on a cross section of an axisymmetric model.

• Display the numerical results of the stress linearization.

The axisymmetric model is of a cylindrical pressure vessel with spherical end caps that is subjected to an internal pressure. The inside diameter of the cylinder is 200 mm and the wall thickness is 20 mm. Assume the following:

• The model has already been solved such that stress results exist.

• The query curves used to define the stress classification lines (SCL) have not been created.

Find the linearized stresses acting on a planar surface through the cylinder and a conical surface through a spherical end cap.

Cylindrical pressure vessel with spherical end caps	Axisymmetric FE mesh for the pressure vessel that also accounts for the plane of reflective symmetry

1. With the Simulation file as the displayed and work file, Menu→Insert→Stress Linearization→Stress Linearization .The Stress Linearization dialog box appears.

2. From the Method list, select 2D Axisymmetric.

3. (Optional) In the Name group, type a name for the stress linearization.

4. (Optional) In the Description group, type a brief description of the stress linearization.

5. In the Result Definition group, from the Load Case and Iteration lists, select the load case and iteration for which the software obtains the stress results for the stress linearization.

6. In the Result Definition group, from the Result Type list, specify whether to use element-nodal or elemental stresses in the stress linearization.

7. In the Stress Classification Line (SCL) group, click Query Curve (line) list.The Query Curve dialog box appears.

8. In the graphics window, select the FE or geometric entities to define the starting and ending points of the SCL.For this model, select nodes and to define the planar surface on which to perform the stress linearization.The SCL is displayed. The arrowhead indicates the positive sense of the SCL.

9. Click OK.The Stress Linearization dialog box appears.

10. In the Midsurface Definition group, from the Curvature list, select Infinite.In this step, you specify the curvature in the axisymmetric (RZ) plane, not the curvature in the hoop (Rθ) plane, where R, θ, and Z are the natural polar coordinate basis for the axisymmetric model.

11. Click OK.

12. To review the results of the stress linearization, in the Simulation Navigator, right-click the node of the stress linearization and choose Report.The Information window opens.

13. After reviewing the results, the Information window.

14. To create the stress linearization for the conical surface through the end caps, repeat steps 1-7.

15. In the graphics window, select the FE or geometric entities to define the starting and ending points of the SCL.For this model, select nodes and to define the conical surface on which to perform the stress linearization.The SCL is displayed. The arrowhead indicates the positive sense of the SCL.

16. Click OK.The Stress Linearization dialog box appears.

17. In the Midsurface Definition group, from the Curvature list, select Specify.

18. In the Value box, enter the numerical value for the radius of curvature to the midplane.In this step, you specify the curvature in the axisymmetric (RZ) plane, not the curvature in the hoop (Rθ) plane, where R, θ, and Z are the natural polar coordinate basis for the axisymmetric model.

19. Click OK.

20. To review the results of the stress linearization, in the Simulation Navigator, right-click the node of the new stress linearization and choose Report.The Information window opens.

21. After reviewing the results, the Information window.

You can also create a SCL from a query curve that you created from a post view display. To do so, in the post view display, create a query curve for the cross-section of interest and then return to the Simulation file. In the Simulation file, you can create a stress linearization using the query curve that you created in the post view display.

To create a query curve from a post view display, in the Post Processing Navigator, right-click Post View and choose New Query Curve.

Learn more

Stress linearization

Stress classification lines

Stress linearization formulas for axisymmetric models

Stress linearization formulas for 3D models

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Perform stress linearization, Simcenter 3D 2021.1 Series

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