Completely Analytical Tools for the Next Generation of Surface and Coating Optimization

Abstract

Usually, some severe efforts are required to obtain tribological parameters like Archard's wear depth parameter k d . Complex tribological experiments have to be performed and analyzed. The paper features an approach where such parameters are extracted from effective interaction potentials in combination with more physical-oriented measurements, such as Nanoindentation and physical scratch. Thereby, the effective potentials are built up and fed from such tests. By using effective material potentials one can derive critical loading situations leading to failure (decomposition strength) for any contact situation. A subsequent connection of these decomposition or failure states with the corresponding stress or strain distributions allows the development of rather comprehensive tribological parameter models, applicable in wear and fatigue simulations, as demonstrated in this work. From this, a new relatively general wear model has been developed on the basis of the effective indenter concept by using the extended Hertzian approach for a great variety of loading situations. The models do not only allow to analyze certain tribological experiments, such as the well known pin-on disk test or the more recently developed nano-fretting test, but also to forward simulate such tests and even give hints for structured optimization or result in better component life-time prediction. The work will show how the procedure has to be applied in general and a small selection of practical examples will be presented.

Special Issue: Tribological Coatings—Properties, Mechanisms, and Applications in Surface Engineering

“…Modeling the behavior of tribological multi-functional coatings requires sophisticated analytical, numerical, and statistical methods to include the effects of mechanical, thermal, and tribological processes on the changes in the properties and durability of coatings [24][25][26]. Experimental tests carried out on multifunctional tribological coatings include methods that simultaneously monitor changes in their properties (mechanical, tribological, electrochemical, and thermal) caused by loads (mechanical, thermal, electrochemical) and by wear processes [26][27][28][29].…”

Measurement of Cohesion and Adhesion of Semiconducting Polymers by Scratch Testing: Effect of Side-Chain Length and Degree of Polymerization

“…Similarly, adhesive failure occurs due to compressive stress in front of the stylus tip, leading to delamination of the film by buckling or spallation. Schwarzer analyzed the stress distribution in scratch tests using the concept of the effective indenter and extended Hertzian theory . In scratch tests both the cohesive and adhesive failure of thin films are thickness dependent, but saturate above a critical thickness (bulk value) .…”

“…Schwarzer analyzed the stress distribution in scratch tests using the concept of the effective indenter and extended Hertzian theory. 16 In scratch tests both the cohesive and adhesive failure of thin films are thickness dependent, but saturate above a critical thickness (bulk value). 15 A prior study showed that cohesion and adhesion increased linearly with thickness for silicone elastomer coatings, until the bulk value was reached.…”