Contact Engineering

Recommended Prerequisites

Not applicable.

Teaching Methods

Not aplicable.

Learning Outcomes

1. The student will master the fundamentals of contact analysis in one-way and reciprocal sliding and rolling.

2. They will learn to determine the critical points for the formation of damages on and under the contact surface.

3. They will master the planning process for the improvement of resistance and tribological properties of contact surfaces, as well as the procedure for the selection of contact surface finishing process and parameters with regard to the stress-strain state. They will understand the importance of proper surface preparation, treatment and modification in ensuring the optimal contact properties.

Work Placement(s)

No

Syllabus

1. Contact between two surfaces; Elastic contact between two curved surfaces: geometry, forces, velocities and stress-strain field; The influence of load on the contact stresses. Hertzian contact theory. Stress analysis of contact in motion. Elastic-plastic contact. Contact between rough surfaces. Thermoelastic contact, thermal instability of contact; Interactions between surface and surroundings, surface energy. 2. Contact surface characterization; Microscopy; Surface film analysis techniques EDS, X-Ray, IR, XPS, Auger,...; profilometry and topography, surface load-carrying capacity; Contact surface hardness and elasticity; Residual stresses in surface layers, surface layer adhesion. 3. Improving the tribological properties of contact surfaces. Protective surface layers. The criteria and procedure for selecting the contact surface texturing and/or finishing, examples of applications in mechanical engineering.

Assessment Methods

Assessment
The exam consists of a written part and oral questioning (50%/50%).Laboratory work (100%). Overall grade is from exam/laboratory work (100%/100%).: 100.0%

Bibliography

1. K.L. Johnson: Contact mechanics, Cambridge University Press, Cambridge, 1985

2. I. Iliuc: Tribology of thin layers, Elsevier, Amsterdam, 1980

3. T.A. Stolarski: Tribology in Machine Design, Butterworth Heinemann, Oxford, 1990

4. F.W. Bach, A. Laarmann, T. Wenz: Modern Surface Technology, Wiley-vch, Weinheim, 2006

5. B. Bhushan, B.K. Gupta: Handbook of tribology – Materials, Coatings and Surface Treatments, McGraw-Hill, New York, 1991

6. K. Holmberg: Coatings Tribology, Elsevier, Amsterdam, 2009

7. K.N. Strafford, P.K. Datta, J.S. Gray: Surface engineering practice, Ellis Horwood, New York, 1990

8. C. Donnet, A. Erdemir: Tribology of diamond-like carbon films: fundamentals and applications, Springer, New York, 2008.