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ME 450 Group Adrian Conrad Chris Cook Thomas Hylton Nathan Wagers High Pressure Water Fixture Conceptual Design Analysis December 10, 2007.

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Presentation on theme: "ME 450 Group Adrian Conrad Chris Cook Thomas Hylton Nathan Wagers High Pressure Water Fixture Conceptual Design Analysis December 10, 2007."— Presentation transcript:

1 ME 450 Group Adrian Conrad Chris Cook Thomas Hylton Nathan Wagers High Pressure Water Fixture Conceptual Design Analysis December 10, 2007

2 Design Objectives Demonstrate understanding of FEA through ANSYS Workbench. Analysis had to prove that the current design was safe to operate under applied pressures. Maximum stress would be below yield strength, therefore preventing plastic deformation. Final analysis would allow for proper modifications to the fixture’s overall design.

3 Introduction High Pressure Water Fixture designed to flow water through interior of an airfoil to clean out any extra debris.

4 Introduction 4,000 psi water flowing into fixture. Stainless Steel fixture material. Arbor adjustability Fixture Dimensions: - Height: 4.5” - Length: 12” - Width: 5”

5 Element Types 186 and 187 type elements Used for Curved Surfaces More nodes allows surface conformability 4 Node Tetrahedral Element 10 Node Tetrahedral Element

6 Utilized Theory Maximum Displacement – For u, v, & w components Von Mises Stress

7 Utilized Theory Contd… Strain Where: And:

8 Model Details Pro/E Model – Assembly of 34 Components IGES File Creation – Solid Type

9 FEA Tool: ANSYS Workbench Why? – Efficient Meshing Automatic Mesh – Ease of Use for Refinement Large Contact Edges Arbor Bottom Edges

10 IGES File Import

11 Large Contact Long Rods IGES File Import (2) Arbor Base Side Large Contacts Socket Bolt Swivel Base Top Long Rods Arbor Cap Swivel Case

12 Model Details: Material Stainless Steel AISI 304 Mechanical Properties T (°C) Density (×1000 kg/m 3 ) 8 25 Poisson's Ratio Elastic Modulus (GPa) Tensile Strength (MPa) Yield Strength (MPa) 205 Hardness (HRB) Thermal Property T (°C) Thermal Expansion (10 -6 /ºC)

13 Geometry Connections Default Contact Regions Need for Fixed Constraints – Large Contact to Threads of 2 Long Rods – Base of Arbor to Socket Bolt – Large Contacts to 2 Swivels – Fixed Support

14 Connections: Large Contact to 1 st Rod

15 Connections: Large Contact to 2 nd Rod

16 Connections: Arbor to Socket Bolt

17 Connections: Large Contact to 1 st Swivel

18 Connections: Large Contact to 2 nd Swivel

19 Fixed Support

20 Defined Loads Worst Case Scenario – Maximum Pressure Uniformly Distributed Force – (4000 psi = MPa) – Perpendicular to Large Contact Faces

21 Defined Loads (2) Ramp Loading of Pressure Forces Approximation of Quick Turn-On of Pressure Washer

22 Defined Loads (3)

23 Defined Loads (4)

24 Mesh Two Different Sizes Used – Relevance Center Coarse Fine Why? – To compare accuracy of displacements and stresses

25 Mesh (2) Types of Elements – SOLID 186 High Order 20-node Brick Elements – SOLID node Quadratic Tetrahedral (H) Elements – CONTACT 170/174 Part to Part Interaction for Assemblies High End Surface to Surface Contact Elements

26 Coarse Mesh

27 Coarse Mesh: Holes and Edges Projected Higher Stresses – Large Contact Holes – Arbor Base Edges Refinement of Mesh – Number of Divisions 15 Elements per Hole – Size of Elements m for Edges

28 Coarse Mesh: Holes and Edges (2) = Hole Refinement = Edge Refinement

29 Coarse Mesh: Number of Divisions

30 Coarse Mesh: Number of Divisions (2)

31 Fine Mesh Relevance Center: Fine Refinement of Mesh – Number of Divisions 30 Elements per Hole

32 Fine Mesh (2)

33

34 Coarse vs. Fine Mesh

35 Analyzing the Results Analysis to look at – Total Deformation – Equivalent (von Mises) Stresses Locate Problem Areas Comparison of Problem Areas – Coarse and Fine Mesh – Brick and Tetrahedral Meshes of Large Contacts

36 Total Deformation Coarse Mesh Fine Mesh

37 Equivalent Stress and Problem Areas Coarse Mesh Fine Mesh Problem Areas

38 Threaded Holes Through Large Contacts Closer Inspection – Brick Mesh – Tetrahedral Mesh – Equivalent Stress Yield Strength of 205MPa Tensile Strength of 515MPa

39 Tetrahedral Meshed Large Contact Equivalent Stress Coarse Mesh Max Stress = 3,500 MPa Fine Mesh Max Stress = 3,500 MPa

40 Brick Meshed Large Contact Equivalent Stress Coarse Mesh Max Stress = 1,700 MPa Fine Mesh Max Stress = 2,000 MPa

41 Summary of Results Total Deformation Seemed Acceptable Equivalent Stresses Highlighted Problems Problem Areas – Tetrahedral Meshed Large Contact Coarse and Fine Mesh – Over yield – Brick Meshed Large Contact Coarse and Fine Mesh – Over yield Design Not Acceptable

42 Design Suggestions Thicken the two connecting rods Thread size increase Large Contact thickness increase Add additional connecting rod

43 Impact Statement High Pressure Water Flow - Successfully clean interior of airfoil - Possibility of injury Current Design - Inner Rod diameters too small - Further development/analysis on overall fixture Safety of overall design/operation still a major concern.

44 Questions?

45 References Moaveni, Saeed. Finite Element Analysis: Theory and Applications with ANSYS, 3 rd Ed., Pearson Prentice Hall, Upper Saddle River, NJ, 2007, 30 Oct Nema, K., Akay, H.U., Ch 13 Three Dimensional Elements, Department of Mechanical Engineering, IUPUI, Indianapolis, IN, 3 March, 2004, 23 Oct s_steels/ 11/26/07 s_steels/


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