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research-article

Effect of crack patterns on the stress distribution of hard chromium coatings under sliding contact: stochastic modelling approach

[+] Author and Article Information
Nicolás S Fochesatto

Department of Engineering, Universidad Nacional del Sur, Bahía Blanca, ArgentinaCONICET, Argentina
nicolas.fochesatto@uns.edu.ar

Fernando S Buezas

Department of Physics, Universidad Nacional del Sur, Bahía Blanca, ArgentinaCONICET, Argentina
fbuezas@ifisur-conicet.gob.ar

M.B. Rosales

Department of Engineering, Universidad Nacional del Sur, Bahía Blanca, ArgentinaCONICET, Argentina
mrosales@criba.edu.ar

Walter R. Tuckart

Department of Engineering, Universidad Nacional del Sur, Bahía Blanca, ArgentinaCONICET, Argentina
wtuckart@uns.edu.ar

1Corresponding author.

ASME doi:10.1115/1.4036181 History: Received September 23, 2016; Revised February 14, 2017

Abstract

In this work, the influence of different crack arrangements in the stress distribution of hard chromium coatings was determined. Three parameters for position and length of the cracks for two different types of coatings were probabilistically modelled based on measured scanning electron microscopy (SEM) images. Probability density functions for those parameters were obtained to characterise each kind of coating. A 2D finite element model of the coating in contact with a rigid disc was developed, modelling cracks with elliptical shapes. A Monte Carlo method was used to simulate different crack distributions for each kind of coating, and values of stress and strains in the domain were obtained. Both the J-integral and the stress intensity factors were taken as comparative parameters of the results. Coatings which statistically present larger quantities of shorter cracks have lower values of J-integral and stress intensity factors, and, therefore, distribute stresses better than those with low density of longer cracks.

Copyright (c) 2017 by ASME
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