WS3-1 PAT301, Workshop 3, October 2003 WORKSHOP 3 FRAME MODEL CREATION USING CURVES, AND ANALYSIS

WS3-2 PAT301, Workshop 3, October 2003

WS3-3 PAT301, Workshop 3, October 2003 Problem Description u Create beam element model of a frame structure that is used to support an engine. The first step is to create geometric curves that represent both the frame and rubber frame supports. Then, the curves are meshed with two noded beam elements. The model loading consists of three parts; they are 1) dead load on the frame due to the weight of the engine, 2) maximum amplitude of the operating load, and 3) gravity load on the frame. The model is constrained at the bottom of the rubber supports. The frame is of Aluminum. A linear static analysis is performed, and the deformed shape and stress distribution are viewed.

WS3-4 PAT301, Workshop 3, October 2003 Suggested Exercise Steps 1. Create new database frame.db. 2. Create geometry of the aluminum frame using curves. 3. Create geometry for the rubber supports using curves. 4. Create 1D bar elements for the model by meshing the curves. 5. Connect the 1D bar elements together at geometry interfaces. 6. Create load due to the static weight(dead load) of the engine on the aluminum frame. 7. Create static load due to the operating engine. The load is the maximum amplitude of the dynamic engine operating loads. 8. Create the static loading due to gravity acting on the aluminum frame. 9. Constrain the bottom of the rubber frame supports. 10. Create aluminum and rubber material property sets. 11. Define element properties for the aluminum frame. 12. Define element properties for rubber frame support.

WS3-5 PAT301, Workshop 3, October 2003 Suggested Exercise Steps 13. Check to see that all loads and boundary conditions have been selected under load cases. 14. Perform linear static analysis for the frame model. 15. Give MSC.Patran access to the MSC.Nastran results by attaching the Nastran.xdb results file under analysis. 16. View the deformation and stress results under Results.

WS3-6 PAT301, Workshop 3, October 2003 Step 1. Create a Database Create a new database. a.File / New. b.Enter frame as the file name. c.Click OK. d.Choose Default Tolerance. e.Select MSC.Nastran as the Analysis Code. f.Select Structural as the Analysis Type. g.Click OK. a b e f d c g

WS3-7 PAT301, Workshop 3, October 2003 Step 2. Create Geometry of the Frame a.Geometry: Create / Curve / XYZ. b.Select on Vector Coordinates List and enter. c.Apply. a b c

WS3-8 PAT301, Workshop 3, October 2003 Step 2. Create Geometry of the Frame (Cont.) a.Geometry: Transform / Curve / Translate. b.Select on Translation Vector and enter. c.Repeat Count: 4. d.Curve List: Select Curve 1. e.Click on Label Control and select curve. You should see 5 curves as shown in the figure. NOTE: We will leave on the Auto Execute. This allows the step to be executed automatically without hitting Apply. a b c d e

WS3-9 PAT301, Workshop 3, October 2003 Step 2. Create Geometry of the Frame (Cont.) a.Transform / Curve / Translate. b.Select on Translation Vector List and enter. c.Repeat Count: 1. d.Curve List: Select all Curves. (Curves 1:5) a b c d

WS3-10 PAT301, Workshop 3, October 2003 Step 2. Create Geometry of the Frame (Cont.) a.Transform / Curve / Rotate. b.Rotate Angle: 90. c.Repeat Count: 1. d.Curve List: Select Curve 1 and 2. a b c d Select curve 1 and 2.

WS3-11 PAT301, Workshop 3, October 2003 Step 2. Create Geometry of the Frame (Cont.) a.Transform / Curve / Translate. b.Translation Vector:. c.Repeat Count: 1. d.Curve List: Select Curve 11 and 12. e.Change Translation Vector to. f.Apply. g.Change Translation Vector to. h.Apply. a b c d

WS3-12 PAT301, Workshop 3, October 2003 Step 2. Create Geometry of the Frame (Cont.) a.Your model should look like the following figure. The model is made of congruent curves.

WS3-13 PAT301, Workshop 3, October 2003 Step 3. Create Curves for Vertical Supports We will create curves for vertical support. a.Geometry: Create / Curve / XYZ. b.Select Vector Coordinates List and enter. c.Apply. d.Change view to Bottom view. a b c d

WS3-14 PAT301, Workshop 3, October 2003 Step 3. Create Curves for Vertical Supports (Cont.) a.Geometry: Transform / Curve / Translate. b.Select on Translation Vector and enter. c.Repeat Count: 5. d.Curve List: Select Curve 19. a b c d

WS3-15 PAT301, Workshop 3, October 2003 Step 3. Create Curves for Vertical Supports (Cont.) a.Select Translation Vector and enter. b.Repeat Count: 1. c.Curve List: Select Curves 19 through 24. d.Change view to Iso 3 View. a b c d

WS3-16 PAT301, Workshop 3, October 2003 Step 3. Create Curves for Vertical Supports (Cont.) a.Now change the Translation Vector to. b.Repeat Count: 1. c.Curve List: Select Curves 19, 20, 23, and 24. d.Your model should look like the following. a b c

WS3-17 PAT301, Workshop 3, October 2003 Step 4. Meshing the Curves a.Elements: Create / Mesh / Curve. b.Unclick Automatic Calculation. c.Enter 12 for Global Edge Length. d.Select on Curve List and include all curves. Click and drag as shown in the figure to select all curves. e.Apply f.Turn off the curve labels and show the node labels. d f a b c d e

WS3-18 PAT301, Workshop 3, October 2003 Step 5. Equivalence All Nodes a.Elements: Equivalence / All / Tolerance Cube. b.Apply. a b Magenta colored circle indicates that a node was deleted.

WS3-19 PAT301, Workshop 3, October 2003 Step 6. Create Dead Load from Engine We will create the first of three sets of loads. a.Loads / BCs: Create / Force / Nodal. b.Select on New Set Name and enter dead_load. c.Input Data. d.Enter for Force. e.OK. f.Select Application Region. g.Geometry Filter: FEM. h.Select on Select Nodes. a b c d f g h

WS3-20 PAT301, Workshop 3, October 2003 Step 6. Create Dead Load from Engine (Cont.) a.Select on the nodes as shown in the figure. b.Add. c.OK. d.Apply. a b c a

WS3-21 PAT301, Workshop 3, October 2003 Step 6. Create Dead Load from Engine (Cont.) a.Select on New Set Name and enter dead_load_2. b.Input Data. c.Enter for Force. d.OK. e.Select Application Region. f.Geometry Filter: FEM. g.Select on Select Nodes. a b c d e f g

WS3-22 PAT301, Workshop 3, October 2003 Step 6. Create Dead Load from Engine (Cont.) a.Select on following Nodes shown in the figure. b.Add. c.OK. d.Apply. a b c a

WS3-23 PAT301, Workshop 3, October 2003 Step 7. Create Operating Engine Static Load a.Select on New Set Name and enter op_static_load. b.Input Data. c.Enter for Force. d.OK. e.Select Application Region. f.Geometry Filter: FEM. g.Select on Select Nodes. a b c d e f g

WS3-24 PAT301, Workshop 3, October 2003 Step 7. Create Operating Engine Static Load (Cont.) a.Select on the nodes as shown in the figure. b.Add. c.OK. d.Apply. a b c a

WS3-25 PAT301, Workshop 3, October 2003 Step 7. Create Operating Engine Static Load (Cont.) a.Select on New Set Name and enter op_static_load_2. b.Input Data. c.Enter for Force. d.OK. e.Select Application Region. f.Geometry Filter: FEM. g.Select on Select Nodes. a b c d e f g

WS3-26 PAT301, Workshop 3, October 2003 Step 7. Create Operating Engine Static Load (Cont.) a.Select on the nodes as shown in the figure. b.Add. c.OK. d.Apply. a b c a a

WS3-27 PAT301, Workshop 3, October 2003 Step 8. Create Gravity Load on Frame a.Loads / BCs: Create / Inertial Load / Element Uniform b.Enter gravity for New Set Name. c.Input Data. d.In Trans Accel enter. e.OK. f.Apply. a b c d e The application region is not specified explicitly by the user. The application region is created by all elements for which density is specified.

WS3-28 PAT301, Workshop 3, October 2003 Step 9. Create Constraints for the Frame Support Constrain bottom of rubber supports for the frame, fixing all six degrees of freedom. a.Loads / BCs: Create / Displacement / Nodal. b.Select on New Set Name: and enter fix_base. c.Select Input Data. d.Enter for Translations and Rotations. e.OK. f.Click on Select Application Region. g.Select Geometry for Geometry Filter. a b c d e f g

WS3-29 PAT301, Workshop 3, October 2003 a.Pick the Point or Vertex icon. b.Change view to Bottom view. c.Select all points at bottom of frame support, as shown in the figure. d.Add. e.OK. f.Apply. Step 9. Create Constraints for the Frame Support (Cont.) a b c

WS3-30 PAT301, Workshop 3, October 2003 Step 9. Create Constraints for the Frame Support (Cont.) a.Select on Iso3 view from the tool bar. Your model should look like the following. b.Reset Graphics. a Although the force directions may appear vertical, they are in fact off angled. You can switch to different views to observe this, or display the components for each vector. b

WS3-31 PAT301, Workshop 3, October 2003 Step 10. Defining Material We will set aluminum as the material of the frame. a.Materials: Create / Isotropic / Manual Input. b.Select on Material Name and enter aluminum. c.Select Input Properties. d.Enter: Elastic Modulus: 10e6. Poisson Ratio: 0.3. Density: 2.61e-4. e.OK. f.Apply. a b c d e f

WS3-32 PAT301, Workshop 3, October 2003 Step 10. Defining Material (Cont.) Create different sets of rubber material. With each set there will be different Elastic Modulus to provide different stiffness needed to keep the frame level. a.Materials: Create / Isotropic / Manual Input. b.Select on Material Name and enter rubber. c.Select Input Properties. d.Enter: Elastic Modulus: Poisson Ratio: 0.4. e.OK. f.Apply. a b c d e

WS3-33 PAT301, Workshop 3, October 2003 Step 10. Defining Material (Cont.) a.Select on Material Name and enter rubber_2. b.Select Input Properties. c.Enter: Elastic Modulus: Poisson Ratio: 0.4. d.OK. e.Apply. f.Select on Material Name and enter rubber_3. g.Select Input Properties. h.Enter: Elastic Modulus: Poisson Ratio: 0.4. i.Ok. j.Apply. a b c d e

WS3-34 PAT301, Workshop 3, October 2003 Step 10. Defining Material (Cont.) a.Now create 3 more materials rubber_4, rubber_5, and rubber_6, with Poisson Ratio of 0.4, a Elastic Modulus of: rubber_4: rubber_5: rubber_6:

WS3-35 PAT301, Workshop 3, October 2003 Step 11. Defining Properties for Frame Structure a.Properties: Create / 1D / Beam. b.Click on Property Set Name and enter al-plate. c.Select Input Properties. d.Click on Mat Prop Name icon and select aluminum from Select Material list. a b c d d

WS3-36 PAT301, Workshop 3, October 2003 Step 11. Defining Properties for Frame Structure (Cont.) a.Bar Orientation:. b.Area: 10. c.Inertia 1,1: 40. d.Inertia 2,2: 8. e.Torsional Constant: 80. f.OK. a b c d e

WS3-37 PAT301, Workshop 3, October 2003 Step 11. Defining Properties for Frame Structure (Cont.) a.Use Label Control to display curve labels, and remove node labels. b.Click on Select Members. c.Select all horizontal(in X-Y plane) curves. (Curves 1:18) d.Add. e.Apply. a c b d e

WS3-38 PAT301, Workshop 3, October 2003 Step 12. Defining Properties for Frame Support a.Properties: Create / 1D / Beam. b.Select Property Set Name and enter support_x1. c.Select Input Properties. d.From the Material Property Sets, select rubber. e.Bar Orientation:. f.Area: 16. g.Inertia 1,1: h.Inertia 2,2: i.Torsional Constant: 36. j.OK. a b c d e f g h i

WS3-39 PAT301, Workshop 3, October 2003 Step 12. Defining Properties for Frame Support (Cont.) a.Reset the graphics to remove the force and constraint markers. b.Click on Select Members. c.Select three vertical curves as shown in the figure. (Curves ) d.Add. e.Apply. Select these three vertical curves b c d e a

WS3-40 PAT301, Workshop 3, October 2003 Step 12. Defining Properties for Frame Support (Cont.) a.Select Property Set Name and enter support_x2. b.Input Properties. c.Click on Material Name and select rubber_2. d.OK. e.Click on Select Members. f.Select Curve 26, 32, and 20 as shown in the figure. g.Add. h.Apply. i.Select Property Set Name and enter support_x3. j.Input Properties. k.Click on Material Name and select rubber_3. l.OK. m.Click on Select Members. n.Select Curve 27 and 21. o.Add. p.Apply Select these three vertical curves a b g e f h

WS3-41 PAT301, Workshop 3, October 2003 Step 12. Defining Properties for Frame Support (Cont.) a.Select Property Set Name and enter support_x4. b.Input Properties. c.Click on Material Name and select rubber_4. d.OK. e.Click on Select Members. f.Select Curve 28 and 22 as shown in the figure. g.Add. h.Apply. i.Select Property Set Name and enter support_x5. j.Input Properties. k.Click on Material Name and select rubber_5. l.OK. m.Click on Select Members. n.Select Curve 23, 33, and 29. o.Add. p.Apply Select these two vertical curves a b e f g h

WS3-42 PAT301, Workshop 3, October 2003 Step 12. Defining Properties for Frame Support (Cont.) a.Select Property Set Name and enter support_x6. b.Input Properties. c.Click on Material Name and select rubber_6. d.OK. e.Click on Select Members. f.Select Curve 24, 34, and 30 as shown in the figure. g.Add. h.Apply. Select these three vertical curves a b e f g h

WS3-43 PAT301, Workshop 3, October 2003 Step 13. Check Assignment of Loads and BCs to Load Case a.Load Cases: Modify. b.Select Default in Select Load Cases to Modify. c.Check that all Loads and BCs are selected. d. Cancel. a b c d

WS3-44 PAT301, Workshop 3, October 2003 Step 14. Analysis Run the analysis of the entire model. a.Analysis: Analyze / Entire Model / Full Run. b.Select Solution Type. c.Choose LINEAR STATIC for Solution Type. d.OK. e.Apply. a b c d

WS3-45 PAT301, Workshop 3, October 2003 Step 15. Access Results Under Analysis We will attach the.xdb file in order to access the results. a.Analysis: Access Results / Attach XDB / Result Entities. b.Click on Select Result File. c.Select and attach the file frame.xdb. d.OK. e.Apply. b c a d e

WS3-46 PAT301, Workshop 3, October 2003 Step 16. Results Create a Quick Plot. a.Hide all labels b.Results: Create / Quick Plot. c.Select A1:Static Subcase under Select Result Cases. d.Select Displacements, Translational under Select Deformation Result. e.Select Deform Attributes. f.Click on Model Scale and set the scale to g.Apply. b c d e f g a

WS3-47 PAT301, Workshop 3, October 2003 Step 16. Results (Cont.) Display shows the deformed shape of the structure.

WS3-48 PAT301, Workshop 3, October 2003 Step 16. Results (Cont.) a.Click Select Results icon. b.Select Bar Stresses, Axial under Select Fringe Result. c.Quantity: X Component. d.Apply. e.File / Close. This ends this exercise. b c a