WORKSHOP 8 TEMPERATURE DEPENDENT MATERIAL PROPERTIES. - презентация

1 WORKSHOP 8 TEMPERATURE DEPENDENT MATERIAL PROPERTIES

2 WS8-2 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation

3 WS8-3 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Model Description In this exercise you will learn to create temperature dependent material properties. There are very few analytical solutions available for composite materials with temperature dependent conductivities. Recently, K.C.Chang and V.J. Payne published an analytic solution for the problem you will analyze in this exercise (Journal of Heat Transfer, Feb. 1991, Vol. 113, pp.237). Results of their work have been included a the end of this exercise to allow you to qualitatively compare your solution to theirs.

4 WS8-4 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Objectives You will create a 2D material slice consisting of two materials with temperature dependent material properties. You will visually and qualitatively compare the MSC/THERMAL results with the results of an analytical solution. Exercise Overview 1. Create a new database named exercise_08.db. Set the Tolerance to Default, and Analysis Code to MSC/THERMAL. 2. Create two surfaces which model the two adjoining material slabs. 3. Mesh the surfaces with an IsoMesh. 4. Identify cracks in the model and Equivalence the nodes at the mating surface edges. 5. Define the two materials using Fields/Create/Material Property/General. 6. Using the fields just defined create Material 1 and Material Apply element properties to the elements referencing the two material properties just defined. 8. Apply the three temperature boundary conditions to the edges of your model. 9. Prioritize temperature boundary conditions at the lower corners. 10. Prepare and submit the model for analysis. 11. Read results file and plot results. 12. Compare the results to the analytical solution. 13. Quit MSC.Patran.

5 WS8-5 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 1: Create a New Database Create a new database called exercise_08. a. File / New. b. Enter exercise_08 as the file name. c. OK. d. Choose Default Tolerance. e. Select MSC.Thermal as the Analysis Code. f. Select Thermal as the Analysis Type. g. OK. a b c d e f g

6 WS8-6 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 2: Create the Two Materials Create two surfaces which model the two adjoining material slabs. a. Geometry. b. Create/Surface/ XYZ. c. Change the Vector Coordinates List to. d. Apply. e. Change the Origins Coordinates List to [ ]. f. Apply. a b c d e f

7 WS8-7 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 3: IsoMesh Both Surfaces Mesh the surfaces with IsoMesh. a. Finite Elements. b. Create/Mesh/Surface. c. Deselect Automatic Calculations d. Set Global Edge Length to e. Click in Surface List box and drag a rectangle around both surfaces. f. Apply. a b d e c f

8 WS8-8 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 4: Equivalence Mesh Nodes Equivalence the nodes at the adjacent surface edges to connect the elements there. a. Under Finite Elements set to Verify/Element/ Boundaries. b. Apply. c. Set to Equivalence/All/Tolerance Cube. d. Apply. a b c d

9 WS8-9 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 5: Define the Material Property Fields Define the two materials. a. Fields. b. Create/Material Property/General. c. Enter Field Name K2, and select Input Data… d. When the General Field Input Data form appears select the Select Function Term mpid_arbt_plyn. a b c d c

10 WS8-10 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 5: Define the Material Property Fields Continue to define the two materials. a. When the Arbitrary (order) Polynomial form appears click on Kelvin under Temperature Units. b. Enter Coefficient Data for material K2. c. Enter in Coefficient, A (index), then enter 1.0E-8. d. Enter a unique description in the Description – Table entry box. e. Click OK twice, then Apply. f. Repeat the above steps for material (Field Name) K1, and 0.06 in Coefficient, A (index), then enter 3.6E-5. a b c d e f

11 WS8-11 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 6: Create Materials Using the fields just defined create Material 1 and Material 2. a. Materials. b. Create/Isotropic/Manual Input. c. Enter Material_1 in Material Name data box. d. Click Input Properties… e. Click Thermal Conductivity data box. f. Under Time, Temperature or Constant Fields select K1. g. Enter values 1.0 for Density and Specific Heat. h. Click OK. i. Click Apply. j. Repeat the same procedure for Material_2, this time selecting K2. k. OK. a b c d e f g i h

12 WS8-12 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 7: Apply Element Properties Create element properties for the elements on the two surfaces. Assign a different material property each surface. a. Properties. b. Create/2D/Thermal 2D. c. Enter Property Set Name Prop1. d. Select Input Properties.. e. Click in Material Name box and select Material_1. f. Click OK. g. Click in Select Members box and select Surface 1 (left surface of the two created earlier). h. Click Add, then Apply. i. Repeat these steps for Surface 2 using Property Set Name Prop2, and Material Name Material_2. a b c d g h e f

13 WS8-13 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 8: Apply Boundary Temperatures to 3 Edges Apply three temperature boundary conditions to the edges of the model. a. Loads/BCs. b. Create/Temperature (PThermal)/ Nodal. c. Set Option to Fixed. d. Enter the name Mat1_Edge_Temp in New Set Name data box. e. Click on Input Data… f. Enter as Fixed Temperature. g. Click OK. h. Click on Select Application Region. i. Click on the Geometry Filter. j. Click on Select Geometry Entities and select the left vertical edge of Surface 1 using clicking the Curve or Edge icon from the Select Menu. k. Select Add, OK, then Apply. a b c d e f g h i k j k

14 WS8-14 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 8: Apply Boundary Temperatures to 3 Edges Repeat this procedure for two more sets of surface edges. a. Use the following information for the two bottom edges. New Set Name: Mat1_2_Bottom_Edge_Temp Fixed Temp: Select Geometry Entities: Surface b. Use the following information for the right edge. New Set Name: Mat2_Edge_Temp Fixed Temp: Select Geometry Entities: Surface 2.3 b Note: applying the temperature boundary conditions to the various edges of the model created a conflict at the two lower corner points. At the lower left corner both the and temperature boundary conditions were applied. At the lower right corner both the and temperature boundary conditions were applied. By default MSC.Patran adds overlapping boundary conditions. To fix (constrain) the lower corner temperatures to the temperature constraint along the bottom edge of the model must be given priority over that of vertical edge boundary conditions. Bottom edge Left edge Right edge a

15 WS8-15 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 9: Prioritize Temperature BCs Prioritize the temperature boundary conditions using a load case, so the temperatures at the lower corners will be prioritized. a. Load Cases. b. Modify. c. Highlight the load case named Default under Select Load Case to Modify. d. Select Mat1_2_Bottom_ Edge_Temp under Assigned Loads/BCs. e. Click Add under Priority. f. Click Value. This LBC is set to priority 1. a b c d e f

16 WS8-16 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 9: Prioritize Temperature BCs Continue prioritizing the temperature boundary conditions. a. Select Mat1_Edge_Temp. b. Click Add under Priority. c. Click Value. This LBC is set to priority 2. d. Repeat this for the last LBC, Mat2_Edge_Temp. e. OK. f. Apply. ab d

17 WS8-17 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 10: Prepare and Run Analysis Prepare and submit the model for analysis. a. Analysis: Analyze/Full Model / Full Run b. Translation Parameters… c. Select 2D Plane Geometry, XY Co-ordinates (Unit Thickness in Z), and Click OK d. Select Solution Parameters.. e. Under Calculation Temperature Scale select Kelvin, and Click OK. f. Select Output Requests… g. Under Units Scale for Output Temperatures click on Celsius, and click OK. h. Apply. a b c d e f g h

18 WS8-18 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 11: Read and Plot Results Read results file and plot results. a. Under Analysis button set Action to Read Result. b. Click on Select Results File… c. Find the pathway that leads to exercise_08 and select it. d. Select the nodal result file, nr000.nrf.01 e. OK. f. Select Select Rslt Template File… g. Select pthermal_1_nodal.res_tm pl. h. OK. i. Apply. a b c d e f g h i

19 WS8-19 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 11: Read and Plot Results. Plot the results. a. Results. b. Create/Quick Plot. c. Select TIME 0.000… under Select Result Cases. d. Select Temperature under Select Fringe Result. e. Select the Fringe Attributes icon. f. Select Display: Element Edges. g. Select Label Style… h. Select Label Format: Fixed. i. Use slider bar to select 4 Significant figures j. OK. k. Apply. a b c e f g h i j k d

20 WS8-20 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 11: Read and Plot Results

21 WS8-21 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 11: Read and Plot Results Plot the results with a custom range. a. Select Range… b. Define Range…/ c. Create… d. Input Compare for New Range Name e. Algorithms: Manual f. Manual Aids: To gets From g. Sub-ranges: 7 h. Input From values: 600, 500, 400, 300, 200, 110, 50. i. Input the final To value of 20 j. Label display: From k. Apply l. Close m. Select Compare from the ranges list. n. Check Post to Viewport o. Ok p. Apply a b c d e f g h i j kl m n o p

22 WS8-22 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 12: Compare Results

23 WS8-23 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 12: Compare Results Compare the results to the analytical solution. a. Shown are the temperature contours by K.C. Chang. And V.J. Payne.

24 WS8-24 PAT312, Workshop 8, December 2006 Copyright 2007 MSC.Software Corporation Step 13: Quit MSC.Patran Quit MSC.Patran. a.Select File. b.Click Quit from the drop down menu.