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Where to Find Examples

stiffening can also change the response frequencies of a system which impacts both modal and transient dynamic problems.

Two different approaches can be used to generate prestressed substructures. These approaches are a static analysis prestress and a substructuring analysis prestress.

10.7.1. Static Analysis Prestress

1.Build the model, define a static analysis (ANTYPE command or menu path Main Menu> Solution> Analysis Type> New Analysis) and apply the stiffening load.

2.Specify that prestress effects be calculated (PSTRES command or menu path Main Menu> Solution> Analysis Type> Analysis Options or Main Menu> Solution> Unabridged Menu> Analysis Type> Analysis Options).

3.Specify that the File.EMAT be written (EMATWRITE command; not available via the GUI)

4.Initiate the static analysis (SOLVE command or menu path Main Menu> Solution> Solve> Current LS).

5.Perform the generation pass. Include the prestress effects from the static analysis by issuing the PSTRES command. (It is important to have the prestress effects active during the static analysis and the generation pass.)

6.Perform the use and expansion passes.

7.Review the results.

10.7.2. Substructuring Analysis Prestress

Note

This method does not require a static analysis on the full DOF model.

1.Build the model and perform the generation pass. Make sure to reserve space for the stress stiffening matrix by setting SESST = 1 on the SEOPT command (Main Menu> Solution> Analysis Type> Analysis Options).

2.Apply loads and perform the static use pass.

3.Perform the expansion pass using the PSTRES command (Main Menu> Solution> Analysis Type> Analysis Options) to calculate prestress effects.

4.Repeat the generation pass for a new substructure generation, while continuing the prestress effects using PSTRES.

5.Solve the second generation pass and perform the use pass.

6.Perform the expansion pass and review the results.

10.8. Where to Find Examples

The Mechanical APDL Verification Manual presents test-case analyses demonstrating the analysis capabilities of the program. While these test cases demonstrate solutions to realistic analysis problems, the

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Mechanical APDL Verification Manual does not present them as step-by-step examples with lengthy data-input instructions and printouts; however, most users with at least limited finite-element experience should be able to fill in the missing details by reviewing each test case's finite element model and input data with accompanying comments.

The Mechanical APDL Verification Manual contains the following substructuring cases:

VM125 - Radiation Heat Transfer Between Concentric Cylinders VM141 - Diametrical Compression of a Disk

VM147 - Gray-Body Radiation within a Frustum of a Cone

VM153 - Nonaxisymmetric Vibration of a Stretched Circular Membrane (Using Cyclic Symmetry)

 

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284

of ANSYS, Inc. and its subsidiaries and affiliates.