Mechanical behavior of DLC coatings under various scratch conditions - École des Ponts ParisTech Access content directly
Conference Papers Year : 2014

Mechanical behavior of DLC coatings under various scratch conditions

Abstract

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.
Fichier principal
Vignette du fichier
FFW_WR 014_v2.pdf (621.25 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-01093241 , version 1 (10-12-2014)

Identifiers

  • HAL Id : hal-01093241 , version 1

Cite

Geoffrey Pagnoux, Siegfried Fouvry, Michaël Peigney, Benoit Delattre, Guillaume Mermaz-Rollet. Mechanical behavior of DLC coatings under various scratch conditions. Internation Conference on Fracture Fatigue and Wear, Sep 2014, Kyushu, Japan. ⟨hal-01093241⟩
434 View
1542 Download

Share

Gmail Facebook X LinkedIn More