The actual contact between solid surfaces is generally rough and time dependent. The stresses induced by the rough contact can only be correctly described using a detailed 3D model. Even finer details are required in the case of surface coatings. Consequently, the rough coated contact problem is strongly multi-scale: the characteristic dimensions of the contact, the coating and the roughness range from the millimeter to the nanometer. A straightforward discretisation of this multi-scale problem would exceed the memory and CPU capacity of current (and next generation) computers. This paper proposes an efficient numerical model that can handle this multi-scale problem: using 109 points and locally refined grids. The proposed model is based on multigrid techniques within a finite difference frame work. Localised refinement is implemented to optimize memory requirement and computing time. Validation of the solver is performed through a comparison with analytical results for simple cases. The algorithm performance is analyzed through a parametric study describing the influence of layer thickness (0.01 < t/a < 10) and mechanical properties (0.005 < Ec/Es < 10) of the coating on the contact parameters (Ph, a). A linear graded coating, used as a solution to avoid interfacial problems, is then compared to a coating with constant properties. A quantitative analysis of the evolution of the maximum tensile stress with depth is conducted in both cases.
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ASME/STLE 2011 International Joint Tribology Conference
October 24–26, 2011
Los Angeles, California, USA
Conference Sponsors:
- Tribology Division
ISBN:
978-0-7918-5474-7
PROCEEDINGS PAPER
A 3D Multigrid Solver for the Elastic Contact Problem: Application to Graded Materials
H. Boffy,
H. Boffy
Universite´ de Lyon, Villeurbanne, France
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M. C. Baietto,
M. C. Baietto
Universite´ de Lyon, Villeurbanne, France
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P. Sainsot,
P. Sainsot
Universite´ de Lyon, Villeurbanne, France
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T. Lubrecht
T. Lubrecht
Universite´ de Lyon, Villeurbanne, France
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H. Boffy
Universite´ de Lyon, Villeurbanne, France
M. C. Baietto
Universite´ de Lyon, Villeurbanne, France
P. Sainsot
Universite´ de Lyon, Villeurbanne, France
T. Lubrecht
Universite´ de Lyon, Villeurbanne, France
Paper No:
IJTC2011-61031, pp. 269-271; 3 pages
Published Online:
February 9, 2012
Citation
Boffy, H, Baietto, MC, Sainsot, P, & Lubrecht, T. "A 3D Multigrid Solver for the Elastic Contact Problem: Application to Graded Materials." Proceedings of the ASME/STLE 2011 International Joint Tribology Conference. ASME/STLE 2011 Joint Tribology Conference. Los Angeles, California, USA. October 24–26, 2011. pp. 269-271. ASME. https://doi.org/10.1115/IJTC2011-61031
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