WORKSHOP 6 DRAPING WITH A SPLIT WS6-1 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation

WS6-2 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation

WS6-3 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Problem Description This workshop introduces the concept of creating a split, or cut, in a ply to reduce the shearing that it might undergo while being draped on a mould. First, some of the geometry is created by importing an IGES file. Then, some surface edges are used to create curves, and some curves are broken to create two sets of curves, each of which is used to create chain curves. The chain curves are used to create trim surfaces. The trim surfaces are meshed. Material properties are created in MSC.Patran by reading a session file. Lamina/plies are created in MSC.Laminate Modeler for two material property sets. The materials are of type scissor or slide. Because the surfaces are highly curved a split is introduced in one of the plies. This shows how to do this important procedure. It is important because any surface, no matter how complex its shape, can be draped if splits are introduced in the draping material/fabric.

WS6-4 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Suggested Exercise Steps: 1. Create a new database. 2. Import surfaces using an IGES file 3. Break edges/curves to create set of curves 4. Chain the curves together 5. Create first of two trimmed surfaces 6. Chain more curves together for another chain curve 7. Trim another surface with The other chain curve 8. View both trim surfaces 9. Create a parametric surface using two trim surface edges 10. Mesh the surfaces using paver mesher 11. Connect the elements and look at free edges 12. Create material properties by reading a session file 13. Create a new layup file 14. Create MSC.Laminate Modeler materials 15. Create MSC.Laminate Modeler plies 16. Modify first ply to create split

WS6-5 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a c Create a database. a.File / New. b.Enter draping_splits as the file name. c.Click OK. d.Click OK. Step 1. Create a New Database d Draping_splits b

WS6-6 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Step 2. Import Surfaces Using an IGES File Create surfaces by importing an IGES file. a.File / Import. b.Select IGES as the Source. c.Select plyshape.igs as the File name. d.Click -Apply-. c d b a

WS6-7 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Step 2. Import Surfaces Using an IGES File (Cont.)

WS6-8 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Step 3. Break Edges/Curves to Create set of Curves Create trimmed surfaces from imported geometric data. First, create a chain curve from a set of curves. Create the set of curves to be used for the first chain curve. a.Geometry : Edit / Curve / Break. b.Uncheck Auto Execute. c.Select edge Surface 1.2 for the Curve List. d.Select Point 12 for the Break Point List. e.Click –Apply-. Turn the label on for the points c d b a e Surface 1.2 Point 12

WS6-9 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Select Curve 14 for the Curve List. b.Select Point 14 for the Break Point List. c.Click –Apply-. d.Click Yes to delete the original curves. a b c Turn the label on for the curves Curve 14 Point 14 Step 3. Break Edges/Curves to Create set of Curves

WS6-10 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Select Surface 1.4 for the Curve List. b.Select Point 8 for the Break Point List. c.Click –Apply-. Surface 1.4 Point 8 a b c Step 3. Break Edges/Curves to Create set of Curves

WS6-11 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Select Curve 18 for the Curve List. b.Select Point 13 for the Break Point List. c.Click –Apply-. d.Click Yes to delete the original curve. Curve 18 Point 13 a b c Step 3. Break Edges/Curves to Create set of Curves

WS6-12 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation The screen should look like this after breaking the edges and curves. Step 3. Break Edges/Curves to Create set of Curves

WS6-13 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Create / Curve / Chain. b.Select Curve for the Curve List. (Hold down the Shift key as you select the curves) c.Click –Apply-. d.Click No to delete the original curves. The original curves will be needed later for construction purposes. Selected curves are highlighted. Turn on the label for the surface. a b c Step 4. Chain the Curves Together

WS6-14 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation The screen should look like this after chaining the curves. Newly created curve is now labeled 22 (*). Step 4. Chain the Curves Together (Cont.) *

WS6-15 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Create / Surface / Trimmed. b.Select Curve 22 for the Outer Loop List. c.Select Surface 2 for the Surface List. d.Click –Apply-. e.Click Yes to delete the original curves and surface. Surface 2 Curve 22 a b c d Step 5. Create First of two Trimmed Surfaces

WS6-16 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Step 5. Create First of two Trimmed Surfaces (Cont.)

WS6-17 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Display / Plot/Erase. b.Select Surface 3 as the Selected Entities. c.Click Erase. d.Click OK. a b c d For viewing purposes, erase the top surface, Surface3. Step 6. Chain More Curves Together for Another Chain Curve b

WS6-18 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Chain the highlighted curves on the bottom surface. Be sure to select the small curve that is circled. Step 6. Chain More Curves Together for Another Chain Curve (Cont.) Chain these curves

WS6-19 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation After following the steps correctly, your screen should look like this. Chain Curve 23 Surface 1 Step 6. Chain More Curves Together for Another Chain Curve (Cont.)

WS6-20 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Create / Surface / Trimmed. b.Select Curve 23 for the Outer Loop List c.Click Surface 1 for Surface List. d.Click –Apply-. e.Click Yes to delete the original curves and surface. a b c d Step 7. Trim Another Surface With The Other Chain Curve

WS6-21 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Make the top trim surface visible. The screen should look like this. Step 8. View Both Trim Surfaces

WS6-22 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Create / Surface / Curve. b.Uncheck Auto Execute. c.Select edge Surface 3.3 as the Starting Curve List. d.Click Surface 4.2 as the Ending Curve List. e.Click –Apply-. Zoom into the middle. Surface 3.3 Surface 4.2 a b c d e Step 9. Create a Parametric Surface Using two Trim Surface Edges

WS6-23 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Create a mesh. a.Elements : Create / Mesh / Surface. b.Quad / Paver / Quad4. c.Select Surface for the Surface List. d.Enter 1.5 for the Global Edge Length. e.Click –Apply-. Step 10. Mesh the Surfaces Using Paver Mesher Click Display Lines for viewing purpose. a c b d e

WS6-24 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Step 10. Mesh the Surfaces Using Paver Mesher (Cont.)

WS6-25 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Merge the nodes and verify the free element edges. a.Elements : Equivalence / All / Tolerance Cube. b.Click –Apply-. Step 11. Connect the Elements and Look at Free Edges a b

WS6-26 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Verify / Element / Boundaries. b.Select Free Edges. c.Click Apply. d.Click Reset Graphics. a b c Step 11. Connect the Elements and Look at Free Edges (Cont.)

WS6-27 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Step 12. Create Material Properties by Reading a Session File b a Play the provided session file. a.File / Session. b.Click Play. c.Select materials.ses as the File name. d.Click -Apply-. (This action will run the session file. Please do not interrupt it.) c WS_4 d

WS6-28 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Tools / Laminate Modeler / Layup/Laminate. b.Click New Layup File. c.Enter splits as the file name. d.Click OK b a Step 13. Create a New Layup File c d

WS6-29 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Create a scissor material using fabric_t300_f934. Also, create a slide material using ud_t300_n5208. a.Create / LM_Material / Add. b.Select Drape (Scissor). c.Select fabric_t300_f934 as the Analysis Material. d.Click –Apply-. e.Select Drape (Slide). f.Select ud_t300_n5208 as the Analysis Material. g.Click –Apply-. Step 14. Create MSC.Laminate Modeler Materials No LM_Materials present c a d b e f g

WS6-30 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation No LM_Plys present Step 15. Create MSC.Laminate Modeler Plies Create two plies using the different materials. Create the first ply. a.Laminate Modeler : Create / LM_Ply / Add. b.Select Drape (Scissor). c.Select Mat_1 as the LM_Material. d.Select the three surfaces, Surface 3:5. e.Set the starting point on the edge above the center. f.Enter Coord 0.3 for the Reference Direction. g.Enter 25 for the Reference Angle. h.Click –Apply-. g b c e h a f d

WS6-31 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Step 15. Create MSC.Laminate Modeler Plies (Cont.)

WS6-32 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation b h g Step 15. Create MSC.Laminate Modeler Plies (Cont.) Create the second ply. a.Laminate Modeler : Create / LM_Ply / Add. b.Select Drape (Slide). c.Select Mat_2 as the LM_Material. d.Use the same surfaces, Surface 3:5. e.Use the same starting point (on the edge above the center). f.Use the same Reference Direction. g.Enter 0 for the Reference Angle. h.Click –Apply-. a c

WS6-33 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation Step 16. Modify First Ply to Create Split Introduce a split in the first ply. a.Laminate Modeler : Modify / LM_Ply / Recreate. b.Select Ply_1 as the Existing LM_Plys. c.Click Additional Controls. d.Click X to reset the graphics. b c a d

WS6-34 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a.Select Boundaries as the control parameter. b.Check Define Splits. c.Select FEM as the Geometry Filter. d.Click in Select 2D Element Edges. e.Select Edge of element picking filter. f.Select six edges as shown to the right. (Hold down the shift key as you select the edges.) g.Click Add. h.Click Preview Split. i.Click OK. c b a g d h i Step 16. Modify First Ply to Create Split (Cont.) f e

WS6-35 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation a a.Click –Apply-. The created split can be seen Note that the yellow shape that MSC.Laminate Modeler draws on the screen after draping is the flat pattern of the ply. If the material/fabric is cut according to this shape it will fit exactly once it is draped over the mould. Because of the shearing this shape is not trivial. It is possible to export this shape in.DXF and IGES formats for use during manufacturing. Step 16. Modify First Ply to Create Split (Cont.)

WS6-36 PAT325, Workshop 6, February 2004 Copyright 2004 MSC.Software Corporation