Presentation to Bond voor Materialenkennis - 27 april 2011 - Mark ...
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Transcript of Presentation to Bond voor Materialenkennis - 27 april 2011 - Mark ...
October 30, 2007 © SKF Group Slide 0
Slijtage in hoogbelastegesmeerde contacten
Presented to:
Bijeenkomst Bond voor Materialenkennis, Aludra, Vlaardingen
Presented by:
Dr. ir. Mark van Drogen,
team leader Functional Surfaces
SKF/Engineering and Research Centre
2011-04-27
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Intro SKF
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SKF Engineering & Research Centre
The SKF Engineering Research Centre (SKF ERC) is located in the SKF Business & Technology Park in Nieuwegein, the Netherlands.
The SKF Engineering & Research Centre has been established in 1972 as the core of SKF Research & Development.
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SKF Engineering & Research Centre
• High level R&D through over a 100 research professionals from more than 25 countries
• Technology for the SKF Platforms
• Product development support the SKF Divisions
• Specialized application support for SKF Customers
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Organisation ERC
Based on Competence Areas
Located in Five departments
• Lubrication & Metallic Materials• Sealing & Functional surfaces
• Modelling & Simulation
• Mechatronics
• Testing
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Competence Areas in SKF ERC
• Steel & Heat treatment
• Ceramics
• Coating
• Polymers & Elastomers
• Sealing
• Lubrication
• Tribo-Chemistry
• Computer modelling & simulation
• Mechatronics
• Testing
• Tribology & Functional Surfaces
cameraLight source
wire connecting cage with camera set-up
rotating holder for visualisation set-up, incl. slip ring
bearing (not visible)
cameraLight source
wire connecting cage with camera set-up
rotating holder for visualisation set-up, incl. slip ring
bearing (not visible)
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Bearing Life – Drivers
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Multi-Scale Modelling in Tribology
Bearing analysisSystem analysis Surface analysis
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Tribology Models for In-Contact Topography and Tribochemistry Behavior
1. Fast models for gap, pressure,temperature and stressvariations inside a lubricated contact:
Stresses
Roughness
Pressures
2. Tribochemisty:
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Friction
Film Thickness & Friction Detailed Measurement
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Surface Topography Optimisation
transverse longitudinal
bi-sinusoidal combined orientation
• Film Build-up• Friction• Temperatures• Pressures• Life
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Wear and Failure diagrams
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Lubricated Wear Mechanisms
1. Abrasive wear 2. Adhesive wear
3. Tribo-Chemical wear 4. (sub)surface Fatigue wear
…and combinations!
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F/v Transition Diagram
Transition from mild to severe adhesive wear
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Lines of defense against adhesive wear
1. EHL films
2. Surface/boundary films
3. Material strength
1à 2 Stribeck curve:
mild wear
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Pin-on-disk measurements
Oil A: fully formulated transmission oil
Oil B: mineral white oil (no additives)
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F/v Transition Diagram Modelling
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F/v Transition Diagram Modelling
Failure Hypothesis: critical oil temperature à
boundary layers cannot withstand the heat in the contact.
Analytical Modelling Approach
1. Deformation Model2. Friction Model
3. Temperature Model
Include deterministic roughness description
Source: M. van Drogen, 2005, Transition to adhesive wear in lubricated concentrated contacts, Ph.D. Thesis, University of Twente.
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Roughess description: 9 points summit definition
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Deformation/Pressure Model
• Macroscopic deformation: Hertzian
• Microscopic/Summit deformation:(1) Elastic, (2) Elasto-Plastic or (3) Plastic
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Deformation Modelling - example
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Friction Model
Stribeck curve included, according to
Load is carried by both EHL film and BL-asperities
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Temperature Model
Blok’s flash temperatures:no roughness
Microscale flash temperatures:so incl. roughness
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Asperity temperatures
Temperature rise
Low speed/Péclet: mainly conduction
High speed/Peclet: mainly convection
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Flash Temperatures - example
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F/v diagram modelling – critical temperatures
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Critical oil temperature determination
Pin-on-disk experiment for mineral white oil (oil B): low F and low v (no frictional heat)
and heat up the oil until adhesive wear
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Parameter study and validation
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Bedankt voor uw aandacht!
