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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 &amp; FE Solution 3D Analytical &amp; FE Solution.

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WEMESURF

Modeling Fretting Contact Mechanisms

Ecole des Mines de Paris

Baris A. YAZICI

WEMESURF

Overview:

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

WEMESURF

FE Modeling:

Material Modeling

FE Solver

Boundary

Conditions

Incremental methodology

FE Solver: Abaqus and Zebulon

Material Model:

Crystal plasticity material model

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Modeling Fretting –Surface Roughness:

Contact length: 10-50

Global COF

Local COF

: contact pressure

:contact traction

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Modeling Fretting –Surface Roughness:

=

Surface roughness

Constant local COF

Variable global COF

Start point:

• FE Calculation
• Analytical Solution

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2D Analytical Solution:

Uphill:

Downhill:

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2D FE Calculation:

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2D FE Calculation :

• Reaction force:
• due to Alpha
• due to Local COF

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2D FE Calculation & Analytical Solution:

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2D FE Calculation & Analytical Solution:

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3D Analytical Solution

3’

1’

2’

Rotation in Alfa and Beta Directions

3

1

2

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3D Analytical Solution

Alpha = 20°

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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

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3D FE Calculation

Y

X

Z

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3D FE Calculation

Global COF

FEM = 0.71

Analytical Solution = 0.91

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3D FE Calculation – Misses Stress

No contact on the

whole surface

Contact area

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3D FE Calculation – Vertical Displacement

Y

• Rotation around z

X

Z

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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

WEMESURF

Thank you.