WEMESURF Modeling Fretting Contact MechanismsEcole des Mines de Paris6th WEMESURF Meeting Radom Baris A. YAZICI

WEMESURFOverview:FE Modeling (General View)

Modeling Fretting 1st approach: Modeling Surface Roughness

2D Analytical & FE Solution

3D Analytical & FE Solution

WEMESURFFE Modeling:Boundary Conditions FE Solver Material Modeling Incremental methodologyFE Solver: Abaqus and ZebulonMaterial Model: Crystal plasticity material model

WEMESURFModeling Fretting Surface Roughness:: contact pressure: contact tractionGlobal COFLocal COFContact length: 10-50

WEMESURFModeling Fretting Surface Roughness:Surface roughnessConstant local COF=Variable global COFStart point: FE CalculationAnalytical Solution

WEMESURF2D Analytical Solution:Uphill: Downhill:

WEMESURF2D FE Calculation:

WEMESURF2D FE Calculation :Reaction force:

due to Alpha due to Local COF

WEMESURF2D FE Calculation & Analytical Solution:

WEMESURF2D FE Calculation & Analytical Solution:

WEMESURF3D Analytical Solution123

Rotation in Alfa and Beta Directions123

WEMESURF3D Analytical Solution

Alpha = 20

WEMESURF3D FE CalculationXZYBoundary Conditions:

Lower Surface (Rigid):Defined displacement in X-Z Plane

Higher Surface:Free in Y, fixed all directions, applied Pressure

Beta = 0Beta = 90Beta = 180

WEMESURF3D FE CalculationXZY

WEMESURF3D FE CalculationGlobal COF

FEM = 0.71Analytical Solution = 0.91

WEMESURF3D FE Calculation Misses StressContact area

No contact on the whole surface

WEMESURF3D FE Calculation Vertical Displacement Rotation around zXZY

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

SummaryWEMESURF

Thank you.WEMESURF