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WEMESURF

WEMESURF. Modeling Fretting Contact Mechanisms. Ecole des Mines de Paris 6th WEMESURF Meeting – Radom Baris A. YAZICI. WEMESURF. Overview:. FE Modeling (General View) Modeling Fretting – 1st approach: Modeling Surface Roughness 2D Analytical & FE Solution 3D Analytical & FE Solution.

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WEMESURF

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  1. WEMESURF Modeling Fretting Contact Mechanisms Ecole des Mines de Paris 6th WEMESURF Meeting – Radom Baris A. YAZICI

  2. WEMESURF Overview: • FE Modeling (General View) • Modeling Fretting – 1st approach: Modeling Surface Roughness • 2D Analytical & FE Solution • 3D Analytical & FE Solution

  3. WEMESURF FE Modeling: Material Modeling FE Solver Boundary Conditions Incremental methodology FE Solver: Abaqus and Zebulon Material Model: Crystal plasticity material model

  4. WEMESURF Modeling Fretting –Surface Roughness: Contact length: 10-50 Global COF Local COF : contact pressure :contact traction

  5. WEMESURF Modeling Fretting –Surface Roughness: = Surface roughness Constant local COF Variable global COF Start point: • FE Calculation • Analytical Solution

  6. WEMESURF 2D Analytical Solution: Uphill: Downhill:

  7. WEMESURF 2D FE Calculation:

  8. WEMESURF 2D FE Calculation : • Reaction force: • due to Alpha • due to Local COF

  9. WEMESURF 2D FE Calculation & Analytical Solution:

  10. WEMESURF 2D FE Calculation & Analytical Solution:

  11. WEMESURF 3D Analytical Solution 3’ 1’ 2’ Rotation in Alfa and Beta Directions 3 1 2

  12. WEMESURF 3D Analytical Solution Alpha = 20°

  13. WEMESURF 3D FE Calculation Beta = 180 Beta = 90 • Boundary Conditions: Lower Surface (Rigid): Defined displacement in X-Z Plane Higher Surface: Free in Y, fixed all directions, applied Pressure Beta = 0 Y X Z

  14. WEMESURF 3D FE Calculation Y X Z

  15. WEMESURF 3D FE Calculation Global COF FEM = 0.71 Analytical Solution = 0.91

  16. WEMESURF 3D FE Calculation – Misses Stress No contact on the whole surface Contact area

  17. WEMESURF 3D FE Calculation – Vertical Displacement Y • Rotation around z X Z

  18. WEMESURF Summary Done • Creation of 2D and 3D FE models • Validation of the analytical solution in 2D To do • Correction of the 3D FE model & validation of the analytical solution • Investigation of a surface with variable degrees • Development of a subroutine which defines COF according to surface topology

  19. WEMESURF Thank you.

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