WS5-1 PAT301, Workshop 5, October 2003 WORKSHOP 5 FRAME SURFACES CREATION. - презентация

1 WS5-1 PAT301, Workshop 5, October 2003 WORKSHOP 5 FRAME SURFACES CREATION

2 WS5-2 PAT301, Workshop 5, October 2003

3 WS5-3 PAT301, Workshop 5, October 2003 Problem Description u The workshop is a revisiting of the frame model created in Workshop 3, except this workshop involves creating surfaces and solids instead of curves to represent the frame and its supports. Once the surfaces and solids have been created they are to be meshed with 2D plate and 3D hexahedral elements, respectively. u After the meshing is complete the remainder of the finite element model representation in MSC.Patran is to be completed(e.g. material, element properties, etc.). Finally, the finite element model file is created and MSC.Nastran is used to solve the problem. The deformation and stress results are to be looked at using MSC.Patran.

4 WS5-4 PAT301, Workshop 5, October 2003 Suggested Exercise Steps 1. Create database named surf_create.db. This workshop involves creating just geometry. No FEM will be created. 2. Create the first surface. It is parametric, and is to be used to represent the web portion of a typical I-beam length of the frame. 3. Extrude the top edge of the web surface(just created) to create the top flange. 4. Copy(transform) the two top surfaces(top flange) to the bottom of the web surface to make the bottom flange. Then, copy(transform) the five surfaces in their long direction to make another five surfaces. 5. Create four points, with two per web surface. These will be used to specify the center of four holes, with two holes per web surface. 6. Create two 360 degree circular curves on the first web surface. Later, these will be used to break the web surface to put two holes in it. 7. Extend the first five surfaces created(before the transform) to create surfaces of proper length for intersecting with surfaces at 90 degrees to them. 8. Break the first web surface with the two curves. This can be done now because the web surface has already been extended(must be parametric to extended). 9. Create two holes in the second web surface by adding the holes. This approach is different than that of breaking a surface with a curve.

5 WS5-5 PAT301, Workshop 5, October 2003 Suggested Exercise Steps 10. Transform the second five surfaces(represents the second typical I-beam length), making two copies. Now, there are four I-beam lengths. 11. Break the outside end of the first I-beam length with a 45 degree plane. This will put a bevel on the end surfaces. Complete breaking the outer surfaces for the first I-beam length. 12. Mirror the first five surface to the other end of all the surfaces(20 surfaces). This places five beveled surfaces at both ends of the model. Close the database because a new one will be used to import a completed surface model. 13. Create a new database named surf_create_part2.db. 14. Import IGES file with completed surfaces. 15. Modify, create, and post groups. This is done to separate certain surfaces to make picking surfaces easier subsequently. Rename default_group to all_surfaces. Create isomesh_surfaces with just the surfaces that will be at the top of the rubber mounts. Add points to isomesh_surfaces using Tools/List/Create. Finally, post both groups all_surfaces and isomesh_surfaces. 16. Create a group for the parametric solids that are to be created, solids. Some points need to be added to that group. Post groups isomesh_surfaces and solids. This is so the surfaces in isomesh_surfaces can be easily picked for extrusion to create the needed parametric solids. 17. Extrude the surfaces in isomesh_surfaces to create the parametric solids. 18. Post groups all_surfaces and solids. This is the complete geometry model.

6 WS5-6 PAT301, Workshop 5, October 2003 Step 1. Create a Database Create a new database. a.File / New. b.Enter surf_create 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

7 WS5-7 PAT301, Workshop 5, October 2003 Step 2. Create a Surface a.Geometry: Create / Surface / XYZ. b.Select on Vector Coordinates List and enter. c.Apply. a b c

8 WS5-8 PAT301, Workshop 5, October 2003 Step 3. Extrude Top Edge a.Geometry: Create / Surface / Extrude. b.Translation Vector:. c.Uncheck Auto Execute. d.Click under Curve List and select the top edge of Surface 1. (Surface 1.2) e.Apply. f.Change view to Iso 1 View. a b c d e f d

9 WS5-9 PAT301, Workshop 5, October 2003 Step 3. Extrude Top Edge (Cont.) a.Change Translation Vector to. b.Apply. c.Select on Label Control icon and select Surface. a b c

10 WS5-10 PAT301, Workshop 5, October 2003 Step 4. Transform Top Surfaces a a.Geometry: Transform / Surface / Translate. b.Translation Vector:. c.Check Auto Execute. d.Click under Surface List and select Surface 2 and 3. d c b d

11 WS5-11 PAT301, Workshop 5, October 2003 Step 4. Transform Top Surfaces (Cont.) a b c a.Geometry: Transform / Surface / Translate. b.Translation Vector:. c.Click under Surface List and select all Surfaces. c

12 WS5-12 PAT301, Workshop 5, October 2003 Step 5. Create Four Points a b c a.Geometry: Create / Point / Extract. b.Select Single Point on Surface icon. c.u Parametric Position: d.v Parametric Position: 0.5. e.Click under Surface List and select Surface 1. f.Change u Parametric Position to g.Apply. d e e

13 WS5-13 PAT301, Workshop 5, October 2003 Step 5. Create Four Points (Cont.) a.u Parametric Position: b.v Parametric Position: 0.5. c.Click under Surface List and select Surface 6. d.Change u Parametric Position to e.Apply. f.Click on Label Control icon and select Points. g.As shown in the figure, you should have created four points, with two points on Surface 1 and the other two on Surface 6. a b c f c

14 WS5-14 PAT301, Workshop 5, October 2003 Step 6. Create 2D Circles a.Geometry: Create / Curve / 2D Circle. b.Input Radius: 2.5. c.Click under Center Point List and select Point 19. d.Now repeat the above steps using Point 20 as the center. a b c d c

15 WS5-15 PAT301, Workshop 5, October 2003 Step 7. Extend Parametric(Green) Surfaces a.Geometry: Edit / Surface / Extend. b.Select Fixed Length icon. c.Select Edit All Associated Surfaces icon. d.Length: 2.0. e.Uncheck Auto Execute. f.Click under Surface Edge and select the following edges as shown in the figure. Select these edges. a b c d e f f

16 WS5-16 PAT301, Workshop 5, October 2003 Step 8. Break Surface with Circular Curves a.Geometry: Edit / Surface / Break. b.Option: Curve. c.Surface List: Select Surface 1. d.Break Curve List: Select Curve 1 and 2. e.Apply. f.Select Yes to delete original surfaces. g.Deselect Point icon from Label Control. a b c d e f g Curve 1 and 2 d Surface 1 c

17 WS5-17 PAT301, Workshop 5, October 2003 Step 8. Break Surface with Circular Curves (Cont.) a.Geometry: Delete / Surface. b.Click under Surface List and select Surface 12 and 14. c.Apply. a b c b

18 WS5-18 PAT301, Workshop 5, October 2003 Step 8. Break Surface with Circular Curves (Cont.) a.Change view to Smooth shaded. b.Your figure should look like the following. c.Change back to Wireframe view. a c

19 WS5-19 PAT301, Workshop 5, October 2003 Step 9. Add Two Holes to Surface a.Geometry: Edit / Surface / Add Hole. b.Option: Center Point. c.Hole Radius: 2.5. d.Click under Surface and select Surface 6. e.Click under Center Point List and select Point 21 and 22 f.Apply. a b c d e f Point 21 and 22 d e

20 WS5-20 PAT301, Workshop 5, October 2003 Step 10. Transform Surfaces a d b a.Geometry: Transform / Surface / Translate. b.Translation Vector:. c.Repeat Count: 2. d.Check Auto Execute. e.Set picking preference to Enclose any portion of entity under Preferences/Picking. f.Click under Surface List and select Surface 6:10 as shown in the figure. c f f e

21 WS5-21 PAT301, Workshop 5, October 2003 Step 10. Transform Surfaces (Cont.) a.Your figure should look like the following.

22 WS5-22 PAT301, Workshop 5, October 2003 Step 10. Transform Surfaces (Cont.) a b c Increase the Point Size in order to have a better view of the points. a.Display / Geometry. b.Point Size: 4. c.Apply.

23 WS5-23 PAT301, Workshop 5, October 2003 Step 11. Create a Breaking Plane a.Geometry: Transform / Point / Translate. b.Select on Translation Vector and enter. c.Repeat Count: 1. d.Click under Point List and select Point 26. Point 26 a b c d d

24 WS5-24 PAT301, Workshop 5, October 2003 Step 11. Create a Breaking Plane (Cont.) a.Geometry: Create / Plane / 3 Points. b.Point 1 List: Point 27. c.Point 2 List: Point 49. d.Point 3 List: Point 30. Point 27 Point 49 Point 30 a b c d b d c

25 WS5-25 PAT301, Workshop 5, October 2003 Step 12. Break the Surfaces at Left End a.Geometry: Edit / Surface / Break. b.Option: Plane. c.Surface List: Select Surface 2, 3, 4, 5, and 13. d.Break Curve List: Select: Plane 1. e.Select Yes for All to delete original surfaces. a b c d c Plane 1 d

26 WS5-26 PAT301, Workshop 5, October 2003 Step 12. Break the Surfaces at Left End (Cont.) a.Geometry: Delete / Surface. b.Depending on how picking, set to either entire entity or any portion of entity under Preferences/Picking. c.Click under Surface List and select Surface 24, 26, 32, 30, and 28. d.Click Apply. e.Change view to Smooth shaded. a c e b d

27 WS5-27 PAT301, Workshop 5, October 2003 Step 12. Break the Surfaces at Left End (Cont.) a.Your figure should look like the following. b.Select Fit View icon. b

28 WS5-28 PAT301, Workshop 5, October 2003 Step 13. Mirror Surface at Left End a.Geometry: Transform / Surface / Mirror. b.Define Mirror Plane Normal: Coord 0.1. c.Offset: 60. d.Check Reverse Surface. e.Click under Surface List and select Surfaces as shown in the figure. a b c d e e

29 WS5-29 PAT301, Workshop 5, October 2003 a.Delete breaking plane under Geometry. b.Close database. Step 13. Mirror Surface at Left End (Cont.)

30 WS5-30 PAT301, Workshop 5, October 2003 Step 14. Create a New Database Create a new database. a.File / New. b.Enter surf_create_part2 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

31 WS5-31 PAT301, Workshop 5, October 2003 Step 15. Import Completed Surfaces a.File / Import. b.Object: Model. c.Source: IGES. d.Current Group: default_group. e.Select complete_surfaces.igs. f.Click Apply. g.Click OK in Import Summary Window. b c a d e f

32 WS5-32 PAT301, Workshop 5, October 2003 Step 16. Modify, Create, Post Group a.Group / Modify. b.Select Rename. c.Rename As: all_surfaces. d.Apply. e.Select Iso 1 View f.Refit graphics a b c d e f

33 WS5-33 PAT301, Workshop 5, October 2003 Step 16. Modify, Create, Post Group (Cont.) a.Change view to Bottom view. b.Group / Create c.New Group Name: isomesh_surfaces. d.Check Make Current. e.Click under Entity Selection. f.Select on View corners icon, then zoom in into the corner as shown in the figure. zoom b c d e f a f

34 WS5-34 PAT301, Workshop 5, October 2003 Select these surfaces e Step 16. Modify, Create, Post Group (Cont.) a.Set to pick only visible entities – pick only ones that can be seen(on front). b.Click O.K. in Message Window. c.Set to pick only those entities that are completely enclosed by the picking rectangle. d.Set the selection filter to surface. e.Select the surfaces shown in the figure. f.Zoom out by selecting Fit view. g.Now, select the remaining surfaces. h.Apply. i.Toggle off the visible entity pick icon. f f c a d g i

35 WS5-35 PAT301, Workshop 5, October 2003 Step 16. Modify, Create, Post Group (Cont.) a.Group / Post. b.Select isomesh_surfaces under Select Groups to Post. c.Apply. a b c a

36 WS5-36 PAT301, Workshop 5, October 2003 Step 16. Modify, Create, Post Group (Cont.) Add Points associated to surfaces in group isomesh_surfaces. a.Tool / List / Create. b.Geometry / Point / Association. c.Association: Surface. d.Click under Surface and select all the surfaces. e.Apply. f.Click Add to Group. g.Group Name: isomesh_surfaces. h.Apply. i.Cancel. j.Cancel. k.Cancel. a b c d e g h i f j k g

37 WS5-37 PAT301, Workshop 5, October 2003 Step 16. Modify, Create, Post Group (Cont.) a.Increase the Point size by Display / Geometry, and setting it to size 4. b.Apply. c.Cancel. a a

38 WS5-38 PAT301, Workshop 5, October 2003 Step 16. Modify, Create, Post Group (Cont.) a.Group / Post. b.Select all_surfaces in addition to isomesh_surfaces under Select Groups to Post. c.Apply. d.Change view to Iso 1 View. a b c a d

39 WS5-39 PAT301, Workshop 5, October 2003 Step 17. Create a New Group: solids a.Group / Create. b.New Group Name: solids. c.Check Make Current. d.Click under Entity Selection and zoom in. Zoom in b c d a d

40 WS5-40 PAT301, Workshop 5, October 2003 Step 17. Create a New Group: solids (Cont.) a.Pick the three Points to include under Entity Selection. b.Select on Fit view icon. c.As shown in the figure, zoom in to that part of the section. Pick these Points a b c Zoom in

41 WS5-41 PAT301, Workshop 5, October 2003 Step 17. Create a New Group: solids (Cont.) a.Pick two more Points. b.Should have selected 5 Points, Points and 103. c.Apply. d.Select Fit view icon. Pick these two Points a b c d

42 WS5-42 PAT301, Workshop 5, October 2003 a.Group / Post. b.Select isomesh_surfaces in addition to solids under Select Groups to Post. c.Apply. d.Zoom to the surfaces at origin. Step 17. Create a New Group: solids (Cont.) Zoom in a b c d

43 WS5-43 PAT301, Workshop 5, October 2003 a.Geometry: Create / Solid / Extrude. b.Solid Type: IsoMeshable. c.Translation Vector:. d.Click under Surface List and select all Surfaces. e.Select Fit view icon. Step 18. Extrude Surface to Create a Solid a b c d e d

44 WS5-44 PAT301, Workshop 5, October 2003 a.All 6 surfaces extruded, and all solids are parametric(blue). b.Zoom in as indicated in the following figure. Step 18. Extrude Surface to Create a Solid (Cont.) b Zoom in b

45 WS5-45 PAT301, Workshop 5, October 2003 a.Geometry: Transform / Solid / Mirror. b.Click on Define Mirror Plane Normal and select 3 Points for the plane icon. c.Select the 3 Points shown in the figure. d.Offset Parameters: 0. e.Check Reverse Solid. f.Uncheck Auto Execute. g.Click under Solid List and select Solid 1 through 6. h.Apply. Step 18. Extrude Surface to Create a Solid (Cont.) Select these 3 Points a b c d e f g h b g

46 WS5-46 PAT301, Workshop 5, October 2003 Now mirror the Solids 1 through 12. a.Geometry: Transform / Solid / Mirror. b.Click on Define Mirror Plane Normal and select 3 Points for the plane icon. c.Select the 3 Points shown in the figure. d.Click under Solid List and select Solid 1 through 12. e.Apply. Step 18. Extrude Surface to Create a Solid (Cont.) Select these 3 Points a b c d e b

47 WS5-47 PAT301, Workshop 5, October 2003 Step 18. Extrude Surface to Create a Solid (Cont.) a.Geometry: Create / Solid / Extrude. b.Solid Type: IsoMeshable. c.Translation Vector:. d.Click under Surface List and select surfaces shown in the figure. Select these 6 sets of surfaces a b c d d

48 WS5-48 PAT301, Workshop 5, October 2003 Step 18. Extrude Surface to Create a Solid (Cont.) a.Geometry: Transform / Solid / Translate. b.Refer. Coordinate Frame: Coord 0. c.Translation Vector:. d.Repeat Count: 3. e.Uncheck Auto Execute. f.Click under Solid List and select Solids shown in the figure. (Solid 41:48) g.Apply. a b c d e f g f

49 WS5-49 PAT301, Workshop 5, October 2003 Step 18. Extrude Surface to Create a Solid (Cont.) a.Your figure should look like the following.

50 WS5-50 PAT301, Workshop 5, October 2003 Step 19. Post Groups all_surfaces and solids a.Group / Post. b.Select all_surfaces and solids under Select Groups to Post. c.Apply. d.Reduce Point size using Point size icon. e.This ends the creation of the geometry for this model. Later it will be meshed and a complete linear model will be created and analyzed. a c d b