Coating structure effect on

stress formation

Composites Product Line

VTT Technical Research Centre of Finland

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Background

Paper rolls, valve spindles, piston rings, gear wheels

Sliding contact

Friction, wear, corrosion

Need for replacement/maintenance

Tackle the challenge with the aid of modelling

Increase understanding of the affecting phenomena

Reduce time from design table to market

Get lifetime estimations

Reduce R&D costs

Improved competitiveness in products and production

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Background - Modelling

Problem Experiments Conclusions,

case limited First

level

Second

level

Third

level

Fourth

level

Understanding

Theory

Modelling and

simulation Experiments Conclusions,

generic,

prediction

Conclusions,

generic

Characterization

Experiments

Conclusions,

case limited

Validation

Validation

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VTT ProperTune™

Computational modelling based material design

methodology and a portfolio of software modules that can

be integrated to solve specific material problems

Collection of material modelling tools applied,

incorporated and developed during the last 15 years

Technique to present in digital form industrial materials

and how they behave in real service conditions

Has been used to understand and optimise material

performance especially in the metal industry

Can be applied to a large variety of materials and surface

coatings

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Pin-on-disc experiment

Pin sliding on a disc

Development of macrolevel

stress during the experiment

Wear can be decreased by

applying a coating on the

material

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Real SEM and Image Analysis

Based Model

Scanning electron microscope

image of a coating structure

Image analysis model of the

coating structure

Complex structure of the coating affects the behaviour

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First Principal Stresses in a Composite

WC/CoCr Coating by Macro- and Micro FEM

Modelling

Change in the stress state when the actual

coating structure is taken into account

Development of custom,

safe to operate and high

performance composite

solutions

Tailor composite structures

for specific property-

performance requirements

and costs

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Advantages of VTT ProperTune™

Increase understanding of the

affecting phenomena

Reduce time-to-market for new

products typically by 50 %

Get lifetime estimations

Reduce R&D costs

Improved competitiveness in

products and production

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