WS8B-1 WORKSHOP 8B TENSION COUPON NAS120, Workshop 8B, November 2003

WS8B-2 NAS120, Workshop 8B, November 2003

WS8B-3 NAS120, Workshop 8B, November 2003 n Problem Description  A tension coupon is constructed from aluminum with E = 10 x 10 6 psi and = 0.3 u The coupon thickness is in u An edge load of 50 lb is applied to the tension coupon

WS8B-4 NAS120, Workshop 8B, November lb 10 in 4 in 2.0 DIA Hole

WS8B-5 NAS120, Workshop 8B, November 2003 n Workshop Objectives u Build the tension coupon geometry u Control the mesh by using techniques discussed in class u Compare FEA stress results to theoretical results From “Stress Concentration Factors” by R. E. Peterson, Figure 86:  max = 432 psi

WS8B-6 NAS120, Workshop 8B, November 2003 n Suggested Exercise Steps 1. Create a new database. 2. Create a geometry model of the tension coupon. 3. Use Mesh Seeds to define the mesh density. 4. Create a finite element mesh. 5. Verify the finite element mesh. 6. Define material properties. 7. Define element properties and apply them to the model. 8. Apply boundary conditions to the model. 9. Apply loads to the model. 10. Submit the model to MSC.Nastran for analysis. 11. Post Process results using MSC.Patran.

WS8B-7 NAS120, Workshop 8B, November 2003 a b c d e f g Step 1. Create New Database Create a new database called tension_coupon_b.db a.File / New. b.Enter tension_coupon_b 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

WS8B-8 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Create the first curve a.Geometry: Create / Curve / XYZ. b.Enter for the Vector Coordinate List. c.Enter [0 0 0] for the Origin Coordinate List. d.Click Apply. a b c d

WS8B-9 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Create the second curve by translating the first curve a.Geometry: Transform / Curve / Translate. b.Enter for the Translation Vector. c.Click in the Curve List box and screen pick the first curve. a b c

WS8B-10 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Create two more curves a.Geometry: Create / Curve / Point. b.Screen pick the point at the bottom of the left curve. c.Screen pick the point at the bottom of the right curve. A curve is automatically created because Auto Execute is checked. d.Screen pick the top of the left curve. e.Finish creating the top curve by screen picking the point at the top of the right curve as shown. a b c e d

WS8B-11 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Create a chain curve a.Geometry: Create / Curve / Chain. b.Rectangular pick all four curves. c.Click Apply. d.When the message box appears, choose Yes to delete the original curves. a b c d

WS8B-12 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Create a circle a.Geometry: Create / Curve / 2D Circle. b.For the circle radius, enter 1.0. c.For the Center Point List enter [5 2 0]. d.Click Apply. a c b d

WS8B-13 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Create a trimmed surface a.Geometry: Create / Surface / Trimmed / Option: Planar. b.Click in the Outer Loop List box. c.Screen pick the outer curve. d.Click in the Inner Loop List box. e.Screen pick the inner circle. f.Click Apply. g.When the message boxes appear, choose Yes to delete the original curves. h.Click the Refresh Graphics icon a b d c e f g h

WS8B-14 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Create two more curves a.Geometry: Create / Curve / XYZ. b.Enter for the Vector Coordinate List. c.Enter [3 0 0] for the Origin Coordinate List. d.Click Apply. e.Repeat this procedure with [7 0 0] as the Origin Coordinate List. a b d c

WS8B-15 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Break the surface into 3 surfaces a.Geometry: Edit / Surface / Break. b.Set the Option to Curve. c.Screen pick the trimmed surface. d.Screen pick the left curve as shown. e.When the message box appears, choose Yes to delete the original surfaces. f.Screen pick the new trimmed surface, and pick the right curve to break it. a b c d e f

WS8B-16 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Create additional points a.Turn Point size on. b.Geometry: Create / Point / Interpolate. c.Set the Option to Curve. d.Screen pick the top of the surface above the circle as shown. e.Repeat the procedure by screen picking each of the other three edges surrounding the circle. a b c d

WS8B-17 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Create four curves a.Geometry: Create / Curve / Point. b.Screen pick the point above the center of the circle as shown. c.Screen pick the point below the center of the circle to create a curve. d.Repeat the procedure by screen picking opposite points surrounding the circle to create four curves as shown. a b c

WS8B-18 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Break the magenta surface a.Geometry: Edit / Surface / Break. b.Screen pick the magenta surface. c.Screen pick a diagonal curve. d.When the message box appears, choose Yes to delete the original surfaces. e.Repeat the procedure to break two surfaces with the second diagonal. f.Repeat the procedure to break two surfaces with the vertical curve. g.Repeat the procedure to break two surfaces with the horizontal curve. a b c d e f g The original magenta surface has been broken into 8 green surfaces.

WS8B-19 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Break the rectangular surfaces a.Geometry: Edit / Surface / Break. b.Set the option to Point. c.Screen pick the left rectangular surface as shown. d.Screen pick the point on the edge of the rectangular surface as shown. e.When the message box appears, choose Yes to delete the original surfaces. f.Repeat the procedure by screen picking the other rectangular surface and the point on the edge of the surface. e a b c d f

WS8B-20 NAS120, Workshop 8B, November 2003 Step 2. Create Geometry Delete excess curves a.Turn Point size off b.Geometry: Delete / Curve. c.Rectangular pick all of the curves as shown. d.Click Apply. e.Click Refresh graphics. b a c d e

WS8B-21 NAS120, Workshop 8B, November 2003 Step 3. Create Mesh Seeds Create a uniform mesh seed a.Elements: Create / Mesh Seed / Uniform. b.Enter 3 for the Number of Elements. c.Click in the Curve List box. d.Screen pick each of the four edges on the left and right sides of the circle as shown. a b c d

WS8B-22 NAS120, Workshop 8B, November 2003 Step 3. Create Mesh Seeds a b c d Create a biased mesh seed a.Elements: Create / Mesh Seed / One Way Bias. b.Enter 6 for the Number of Elements. c.Enter 4 for L2/L1. Depending on the direction of the arrow, you may have to enter 0.25 (or-4) to get the correct biasing. d.Click on the Curve List box. e.Screen pick the four remaining edges on the circle. f.Screen pick the horizontal edge to the right of the circle. e f

WS8B-23 NAS120, Workshop 8B, November 2003 The mesh seeds should agree with the picture on the right. Step 3. Create Mesh Seeds

WS8B-24 NAS120, Workshop 8B, November 2003 Step 4. Create Mesh Create a finite element mesh a.Elements: Create / Mesh / Surface. b.Set the Element Shape to Quad, Mesher to IsoMesh, and Topology to Quad4. c.Click in the Surface List box. d.Rectangular pick the surfaces as shown. e.Enter 0.5 as the value for Global Edge Length. f.Click Apply. a b c f e d

WS8B-25 NAS120, Workshop 8B, November 2003 Step 4. Create Mesh Equivalence the model a.Elements: Equivalence / All / Tolerance Cube. b.Click Apply. a b

WS8B-26 NAS120, Workshop 8B, November 2003 Step 5. Verify Mesh Verify the quality of the finite elements a.Elements: Verify / Quad / All. b.Click Apply. c.Review the summary table. a b c

WS8B-27 NAS120, Workshop 8B, November 2003 Step 5. Verify Mesh Perform specific quality tests on the elements. a.Elements: Verify / Quad / Aspect. b.Click Apply. c.Review the fringe plot. d.Repeat for Warp, Skew, and Taper tests. e.Reset Graphics a b c d e

WS8B-28 NAS120, Workshop 8B, November 2003 Step 6. Create Material Properties Create an isotropic material a.Materials: Create / Isotropic / Manual Input. b.Enter aluminum as the Material Name. c.Click Input Properties. d.Enter 10e6 for the elastic modulus and 0.3 for the Poisson Ratio. e.Click OK. f.Click Apply. a b c d f e

WS8B-29 NAS120, Workshop 8B, November 2003 d f g e Step 7. Create Element Properties Create element properties a.Properties: Create / 2D / Shell. b.Enter plate as the Property Set Name. c.Click Input Properties. d.Click on the Select Material Icon. e.Select aluminum as the material. f.Enter for the thickness. g.Click OK. a b c

WS8B-30 NAS120, Workshop 8B, November 2003 Step 7. Create Element Properties Select application region a.Click in the Select Members box. b.Rectangular pick the surfaces as shown. c.Click Add. d.Click Apply. a c d b

WS8B-31 NAS120, Workshop 8B, November 2003 Step 8. Apply Boundary Conditions Create the boundary condition a.Loads/BCs: Create / Displacement / Nodal. b.Enter fixed as the New Set Name. c.Click Input Data. d.Enter for Translations and for Rotations. e.Click OK. a b d e c

WS8B-32 NAS120, Workshop 8B, November 2003 Step 8. Apply Boundary Conditions Apply the boundary condition a.Click Select Application Region. b.Select the Curve or Edge filter. c.Select the bottom left edge of the surface. d.Click Add. e.Select the top left edge of the surface. f.Click Add. g.Click OK. h.Click Apply. a g h b c e d f

WS8B-33 NAS120, Workshop 8B, November 2003 Step 8. Apply Boundary Conditions The boundary condition should agree with what’s shown on the right

WS8B-34 NAS120, Workshop 8B, November 2003 Step 9. Apply Loads Create the load a.Loads/BCs: Create / Total Load / Element Uniform. b.Enter force as the New Set Name. c.Set the Target Element Type to 2D. d.Click Input Data. e.Enter for the Edge Load. f.Click OK. d b c a e f

WS8B-35 NAS120, Workshop 8B, November 2003 Apply the load a.Click Select Application Region. b.For the application region select the right edge of the top right surface as shown. c.Click Add. d.Select the right edge of the bottom right surface. e.Click Add. f.Click OK. g.Click Apply. Step 9. Apply Loads a b c f g e d

WS8B-36 NAS120, Workshop 8B, November 2003 Step 9. Apply Loads The loads and boundary condition should agree with what’s shown on the right.

WS8B-37 NAS120, Workshop 8B, November 2003 Step 10. Run Linear Static Analysis Analyze the model a.Analysis: Analyze / Entire Model / Full Run. b.Click Solution Type. c.Choose Linear Static. d.Click OK. e.Click Apply. a e b d c

WS8B-38 NAS120, Workshop 8B, November 2003 Step 11. Post Process with MSC.Patran Attach the results file a.Analysis: Access Results / Attach XDB / Result Entities. b.Click Select Results File. c.Choose the results file tension_coupon_b.xdb. d.Click OK. e.Click Apply. a b c e d

WS8B-39 NAS120, Workshop 8B, November 2003 Step 11. Post Process with MSC.Patran Erase geometry a.Display: Plot/Erase. b.Under Geometry click Erase. c.Click OK. a b c

WS8B-40 NAS120, Workshop 8B, November 2003 Step 11. Post Process with MSC.Patran Create a Quick Plot of X Component Stress a.Results: Create / Quick Plot. b.Select Stress Tensor as the Fringe Result. c.Select X Component as the Fringe Result Quantity. d.Click Apply. e.Record the maximum X component stress. Max X Stress = ________ a b c d

WS8B-41 NAS120, Workshop 8B, November 2003 Step 11. Post Process with MSC.Patran a b c d g h f e Turn off averaging a.Results: Create / Fringe. b.Select Stress Tensor as the Fringe Result. c.Select X Component as the result quantity. d.Click on the Plot Options Icon. e.Change the Coordinate Transformation to CID. f.Select Coordinate 0. g.Change the Averaging Definition Domain to None. h.Click Apply.

WS8B-42 NAS120, Workshop 8B, November 2003