Buckling Analysis of a Thin-Shell Cylinder
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1 LESSON 14 Buckling Analysis of a Thin-Shell Cylinder Objectives: Create a geometrical representation of a thin-shell cylinder. Use the geometry model to define a MSC/NASTRAN analysis model comprised of CQUAD4 and RBE3 elements. Prepare a MSC/NASTRAN input file for a Buckling analysis. Visualize analysis results. MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
2 14-2 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
3 LESSON 14 Thin-Shell Cylinder (Sol 105) Model Description: Below is a geometric representation of the thin-shell cylinder presented on Page The cylinder has a 10 inch mean radius, sits 20 inches high and has a constant thickness of 0.03 inches. A compressive force is distributed to the cylinder via an RBE3 element (not shown). The cylinder is simply-supported at its base in all three translational directions. A similar constraint is applied to the top rim except the rim is allowed to translate in the -direction. =20 in A lbs A 0.03 in T R R=9.985 in =0 in VIEW A-A Elastic Modulus: 1.0E7 psi Poisson Ratio: 0.3 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-3
4 Suggested Exercise Steps: Exercise Procedure: Open a new database. Define a geometric representation of the cylinder using a surface. Define an analysis model by meshing the geometry model with shell (CQUAD4). Generate an RBE3 element. Define material (MAT1) and element properties (PSHELL). Define boundary constraints (SPC1) at the base & rim and apply a compressive load (FORCE) to the rim via the RBE3. Use the load and boundary condition sets to define a loadcase (SUBCASE). Prepare the model for a Buckling analysis (SOL 105 & PARAMs). Generate and submit input file for MSC/NASTRAN. Post-process results. Quit MSC/PATRAN. 1. Create a new database called lesson14.db. File/New Database... New Database Name: lesson14 In the New Model Preference form set the following: Tolerance: Analysis Code: Analysis Type: Default MSC/NASTRAN Structural 14-4 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
5 LESSON 14 Thin-Shell Cylinder (Sol 105) 2. Use the Viewing/Angles... option to change the view of the model. Viewing/ Angles... Method: Model Absolute Angles: -67., 0, 34. Cancel 2a. Use the Viewing/Named View Options... to create a customized view setting. Viewing/ Named View Options... Create View... Create New View: Close nas120_iso 2b. We will need one other customized view setting. Viewing/ Angles... Method: Model Absolute Angles: -90., 0, 0. Cancel Viewing/ Named View Options... Create View... Create New View: nas120_side MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-5
6 Also, change the view of the model. Select Named View: nas120_iso Close 2c. Create a new point and use this point to define the origin of a local cylindrical coordinate system. Geometry Action: Create Object: Point Method: XY Point Coordinates List: [0, 0, 0] Action: Create Object: Coord Method: Euler Type: Cylindrical Rotation Parameters... Angle of Rotation: 0.0 Angle of Rotation: 0.0 Angle of Rotation: 0.0 Origin: [0, 0, 0] 14-6 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
![Geometry Action: Create Object: Point Method: XY Point Coordinates List: [0, 0, 0] Action: Create Object: Coord Method:](/docs-images/48/23879227/images/page_6.jpg "Euler Type: Cylindrical Rotation Parameters... Angle of Rotation: 0.0 Angle of Rotation: 0.")
7 LESSON 14 Thin-Shell Cylinder (Sol 105) 2d. Create another point by translating Point 1 a radial distance of 10 inches. Note that the reference coordinate frame is the local cylindrical system. Action: Transform Object: Point Method: Translate Refer. Coordinate Frame: Coord 1 Translation Vector: <10, 0, 0> Auto Execute Point List: Point 1 There is no need to click the button since the Auto Execute button is toggled on. 3. Use Point 2 to create a curve by sweeping it 90 degrees about the -axis of the local coordinate system. Action: Create Object: Curve Method: Revolve Refer. Coordinate Frame: Coord 1 Axis: Coord 0.3 Total Angle: 90.0 Auto Execute Point List: Point 2 Activate the entity labels by selecting the Show Labels icon on the toolbar. Show Labels MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-7
8 Your model should appear as follows: Y T 1 1 X R 3a. Generate one-quarter of the cylinder wall by extruding the curve created in the previous operation. Action: Create Object: Surface Method: Extrude Refer. Coordinate Frame: Coord 1 Translation Vector: <0, 0, 20> Auto Execute Curve List: Curve 1 Now complete the model by rotating this surface about an local - axis. Action: Transform Object: Surface Method: Rotate Refer. Coordinate Frame: Coord 1 Axis: Coord 0.3 Total Angle: MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
9 LESSON 14 Thin-Shell Cylinder (Sol 105) Repeat Count: 3 Auto Execute Surface List: Surface 1 Your model should appear as follows: T 1 1 R Y X 4. Before you mesh the model, plant mesh seeds to define the size of the elements. Note that the mesh seeds will have precedence over the Global Edge Length parameter in the Create/Mesh form You may wish to make the nodes that will be generated during the meshing operation more visible. Do this by changing the node size using the Display/Finite Elements... option. Display/Finite Elements... Node Sizes: 5 Cancel MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-9
10 4a. Create 18 elements along the bottom of the surfaces and 20 elements along the height. Finite Elements Action: Create Object: Mesh Seed Type: Uniform Number = 18 Curve List: Surface 1:4.4 Number = 20 Curve List: Surface 1.1 The mesh seeds should appear as follows: T 1 1 R Y X 5. Generate an analysis model by meshing the geometry model MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
11 LESSON 14 Thin-Shell Cylinder (Sol 105) Note: The node locations are to be specified with respect to our local cylindrical system (i.e. in r-θ z coordinates). Hence, we control this by designating the local coordinate system as the Reference Coordinate frame. However, it is desired to have our displacement results be generated with respect to our Global coordinate system. Therefore our Analysis Coordinate Frame references the Global coordinate system. Finite Elements Action: Create Object: Mesh Type: Surface Element Topology: Mesher: Node Coordinate Frames... Quad4 IsoMesh Analysis Coordinate Frame: Coord 0 Refer. Coordinate Frame: Coord 1 Surface List: Surface 1:4 Dectivate the entity labels by selecting the Hide Labels icon on the toolbar Hide Labels MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-11
12 You model should appear as follows: Y X T 1 R Remember to equivalence the model to remove duplicate nodes at common surface edges. Finite Elements Action: Equivalence Object: All Method: Tolerance Cube 6. Use the Viewing/Named View Options... to change the view of the model. Viewing/ Named View Options... Select Named View: Close default_view 7. Erase All FEM for clarity using the option in Display/ Plot/Erase... Display/Plot/Erase MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
13 LESSON 14 Thin-Shell Cylinder (Sol 105) Erase All FEM Refresh the display when needed using the brush icon on the Top Menu Bar. Refresh Graphics 7a. Create a new node at =20 inches. The compressive load will be applied to this node. The Analysis & Reference coordinate frames are set in accordance with the previous Step. Finite Elements Action: Create Object: Node Method: Edit Node ID List: 5000 Analysis Coordinate Frame: Coord 0 Refer. Coordinate Frame: Coord 1 Associate with Geometry Node Location List: [0, 0, 20] 7b. Turn on node labels. Display/Entity Color/Label/Render... (Scroll Down) Node: Cancel Label MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-13
14 The model should appear as follows: T 1 R 5000 Y X 8. Next, create an RBE3 element to distribute the load from the load application node to the cylinder walls. Display/Plot/Erase... Plot All Posted FEM Erase All Geometry 8a. Use your mouse to place the top row of elements and their top most nodes into a new group called rbe3_region. Make this group current and post only this group to the display. Viewing/ Named View Options... Select Named View: nas120_side Close Preferences/Picking... Single Picking: Rectangle/Polygon Picking: Entity Enclose any portion of entity MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
15 LESSON 14 Thin-Shell Cylinder (Sol 105) Close Group/Create... New Group Name: Make Current Unpost All Other Groups rbe3_region Entity Selection: Node 381: : : : Elm 360: : : :1440 Cancel Viewing/ Named View Options... Select Named View: Close nas120_iso To scale the view to fit the window, click the Fit View icon in the Main Form. Fit View MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-15
16 8b. At this point, your model should appear as follows: Y X T 1 R Finite Elements Action: Create Object: MPC Type: RBE3 Define Terms... Create Dependent Auto Execute Node List: Node 5000 DOFs UX UY U RX RY R Create Independent Node List: (Select remaining nodes) See Note Below MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
17 LESSON 14 Thin-Shell Cylinder (Sol 105) NOTE: Select your independent nodes by using the polygon pick feature of your mouse (Ctrl-mouse click) DOFs UX Displ_fixed UY Press_axial_loading U Cancel This operation should yield the following display: Y X T 1 R 8c. Create a new group consists of all the geometry called geometry_only and make it current. Group/Create... New Group Name: Make Current Unpost all other groups Group Contents: geometry_only Add All Geometry MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-17
18 9. Define a material using the specified Modulus of Elasticity, Poisson ratio & density. Materials Action: Create Object: Isotropic Method: Manual Input Material Name: Input Properties... aluminum Constitutive Model: Linear Elastic Elastic Modulus = 1.0e7 Poisson Ratio =.3 The Current Constitutive Models form should appear as below: Linear Elastic - [,,,,] - [Active] Cancel 10. Now, reference the material you just defined when you specify element properties for your analysis model. Remember to use the specified cylinder thickness. Properties Action: Create Object: 2 D Method: Shell Property Set Name: Input Properties... Material Name: cylinder_prop m:aluminum MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
![3 The Current Constitutive Models form should appear as below: Linear Elastic - [,,,,] - [Active] Cancel 10.](/docs-images/48/23879227/images/page_18.jpg "Now, reference the material you just defined when you specify element properties for your analysis model. Remember to use the specified cylinder thickness.")
19 LESSON 14 Thin-Shell Cylinder (Sol 105) Thickness: 0.03 Select Members: Surface 1:4 Add 11. Define the boundary constraints for the model. Refresh the display as needed before continuing. 11a. Create displacement constraints and apply it to the model. Recall that the top and base of the cylinder have different boundary conditions. We will apply these constraints to the geometry model instead of the analysis model. First, we define the base constraints: Load/BCs Action: Create Object: Displacement Method: Nodal New Set Name base Input Data... Translation < T1 T2 T3 > < 0, 0, 0> Select Application Region... Geometry Filter: Geometry Select Geometry Entities: Surface 1:4.4 Add MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-19
20 11b. Next, we define the rim constraints: Load/BCs Action: Create Object: Displacement Method: Nodal New Set Name: Input Data... top Translation < T1 T2 T3 > < 0, 0, > Select Application Region... Geometry Filter: Geometry Select Geometry Entities: Surface 1:4.2 Add MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
21 LESSON 14 Thin-Shell Cylinder (Sol 105) The displacement constraints should appear as follows: T 1 R 123 Y X Display/Entity Color/Label/Render... (Scroll Down) Node: Cancel Label Display/Plot/Erase... Erase All FEM Selected Entities: Node 5000 Plot Refresh the display when needed using the brush icon on the Top Menu Bar. Refresh Graphics MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-21
22 12. the compressive force along the local -axis of Node Load/BCs Action: Create Object: Force Method: Nodal New Set Name: Input Data... load Force <F1 F2 F3> <,, > Select Application Region... Geometry Filter: FEM Select Nodes: Node 5000 Add MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
23 LESSON 14 Thin-Shell Cylinder (Sol 105) The load and boundary constraints should appear as follows: T 1 R Y X 13. For clarity, create a new group called fem_only that consists only of analysis model entities. Group/Create... New Group Name: Make Current Unpost All Other Groups Group Contents: fem_only Add All FEM Cancel 13a. Since the boundary & load sets were applied to the geometry model, the display of the load sets will only appear on the geometry model. This can be changed using Display/Load/BC/Elem. Props... option. Display/Load/BC/Elem. Props... MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-23
24 Show on FEM Only 13b. Also, for clarity, you may wish to disable the display of vector values. Display/Load/BC/Elem. Props... Show LBC/El. Prop Vectors Cancel Turn off all node labels as well. Display/Finite Elements... Node: Cancel fem_only Label 13c. Display all of the loads & boundary markers on the analysis model. Load/BCs Action: Plot Markers Select all the Load/BC sets in the Assigned Load/BCs Sets box by highlighting all of them. And post the markers onto the current group. Assigned Load/BCs Sets: Select Groups: Displ_base Displ_top Force_load fem_only 14. Change the Render Style of your model from Wireframe to Hidden Line. Display/Entity Color/Label/Render MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
25 LESSON 14 Thin-Shell Cylinder (Sol 105) Render Style: Cancel Hidden Line Your model should appear as follows: Y X 15. Now you are ready to generate an input file for analysis. Click on the Analysis radio button on the Top Menu Bar and complete the entries as shown here. Analysis Action: Analyze Object: Entire Model Method: Analysis Deck Job Name: Translation Parameters... cylinder OUTPUT2 Format: Binary MSC/NASTRAN Version: set accordingly, here it is 70 MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-25
26 Solution Type... Solution Type: Solution Parameters... Buckling Database Run Automatic Constraints Data Deck Echo: Sorted Plate Rz Stiffness Factor = Wt.- Mass Conversion = (For English units) Eigenvalue Extraction Number of Desired Roots = 2 An input file named cylinder.bdf will be generated. The process of translating your model into an input file is called the Forward Translation. The Forward Translation is complete when the Heartbeat turns green. 16. If all is well, you will then submit the input file to MSC/ NASTRAN for analysis. To do this, find an available xterm window and at the prompt enter: nastran cylinder.bdf scr=yes Monitor the run using the UNIX ps command. 16a. When the run is completed, edit the cylinder.f06 file and search for the word FATAL. If none exists, search for the word WARNING. Determine whether or not existing WARNING messages indicate modeling errors. 16b. While still editing cylinder.f06, search for the word: R E A L (spaces are necessary) MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
27 LESSON 14 Thin-Shell Cylinder (Sol 105) What are the eigenvalues associated with the 2 buckling modes for our structure? mode 1 = mode 2 = What is the critical buckling load for this structure? 17. Proceed with the Reverse Translation process, that is, importing the cylinder.op2 results file into MSC/ PATRAN.To do this, return to the Analysis form and proceed as follows: Analysis P cr = Action: Read Output2 Object: Result Entities Method: Translate Select Results File... Filter Selected Results File: select the desired.op2 file When the translation is complete and the Heartbeat turns green, bring up the Results form. Results Action: Create Object: Quick Plot Choose the desired result case in the Select Result Cases list and select the result(s) in the Select Fringe Result list and/or in the Select Deformation Result list. And click to view the result(s) in the viewport. MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5) 14-27
28 If you wish to reset your display graphics to the state it was in before you began post-processing your model, remember to select the broom icon. Reset Graphics Quit MSC/PATRAN when you have completed this exercise MSC/NASTRAN 120 Exercise Workbook - Version 70 (MSC/PATRAN 7.5)
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