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:
ME 450 Group Adrian Conrad Chris Cook Thomas Hylton Nathan Wagers High Pressure Water Fixture Conceptual Design Analysis December 10, 2007
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.
Introduction High Pressure Water Fixture designed to flow water through interior of an airfoil to clean out any extra debris.
Mesh Two Different Sizes Used – Relevance Center Coarse Fine Why? – To compare accuracy of displacements and stresses
Mesh (2) Types of Elements – SOLID 186 High Order 20-node Brick Elements – SOLID 187 10-node Quadratic Tetrahedral (H) Elements – CONTACT 170/174 Part to Part Interaction for Assemblies High End Surface to Surface Contact Elements
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
Equivalent Stress and Problem Areas Coarse Mesh Fine Mesh Problem Areas
Threaded Holes Through Large Contacts Closer Inspection – Brick Mesh – Tetrahedral Mesh – Equivalent Stress Yield Strength of 205MPa Tensile Strength of 515MPa
Tetrahedral Meshed Large Contact Equivalent Stress Coarse Mesh Max Stress = 3,500 MPa Fine Mesh Max Stress = 3,500 MPa
Brick Meshed Large Contact Equivalent Stress Coarse Mesh Max Stress = 1,700 MPa Fine Mesh Max Stress = 2,000 MPa
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
Design Suggestions Thicken the two connecting rods Thread size increase Large Contact thickness increase Add additional connecting rod
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.
References Moaveni, Saeed. Finite Element Analysis: Theory and Applications with ANSYS, 3 rd Ed., Pearson Prentice Hall, Upper Saddle River, NJ, 2007, 30 Oct 2007. Nema, K., Akay, H.U., Ch 13 Three Dimensional Elements, Department of Mechanical Engineering, IUPUI, Indianapolis, IN, 3 March, 2004, 23 Oct 2007. http://www.efunda.com/materials/alloys/stainles s_steels/ 11/26/07 http://www.efunda.com/materials/alloys/stainles s_steels/