Mechanical behavior of DLC coatings under various scratch conditions
| Autor: | Pagnoux, Geoffrey, Fouvry, Siegfried, Peigney, Michaël, Delattre, Benoit, Mermaz-Rollet, Guillaume |
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| Přispěvatelé: | Laboratoire de Tribologie et Dynamique des Systèmes (LTDS), École Centrale de Lyon (ECL), Université de Lyon-Université de Lyon-École Nationale des Travaux Publics de l'État (ENTPE)-Ecole Nationale d'Ingénieurs de Saint Etienne-Centre National de la Recherche Scientifique (CNRS), Matériaux et Structures Architecturés (msa), Laboratoire Navier (navier umr 8205), École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR), PSA Peugeot - Citroën (PSA), PSA Peugeot Citroën (PSA), Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-École des Ponts ParisTech (ENPC)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: | |
| Zdroj: | Internation Conference on Fracture Fatigue and Wear Internation Conference on Fracture Fatigue and Wear, Sep 2014, Kyushu, Japan |
| Popis: | International audience; In lubricated sliding contact systems with Diamond-Like Carbon (DLC) coated solids, several studies have shown DLC coatings are highly sensitive to asperities breaking through the lubricant film within the contact area. Those asperities produce damages similar to those obtain from scratch tests, from where coating delamination can initiate and propagate. In the present study, controlled scratches have been performed on DLC-coated samples by varying the tip radius, the normal load and the sliding speed. From one hand, the different fracture mechanisms are compared to those observed on a coated cam-tappet system. They both lead to similar damage and wear, from substrate plasticity to gross spallation, via tensile and angular cracking. On the other hand, a numerical analysis is conducted with a finite element model. It reveals the fracture mechanism can be qualitatively predicted. Additional computations show the scratch severity increases by considering a thinner coating. This upholds the observed experimental coupling between tribochemical wear, scratch networks and coating delamination. |
| Databáze: | OpenAIRE |
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