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

N. FOCHESATTO; F. BUEZAS; M. ROSALES; W. TUCKART

JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME

ASME-AMER SOC MECHANICAL ENG

Lugar: New York; Año: 2017 vol. 139 p. 1 - 10

0742-4787

In this work, the inuence of dierent crack arrangements in the stress distribution of hard chromium coatings was determined. Three parameters for position and length of the cracks for two dierent types of coatings were probabilistically modelled measuring SEM images. Probability density functions for those parameters were obtained to characterise each kind of coating. A 2D nite element model of the coating in contact with a rigid disc was developed, modelling cracks with ellipses shapes. A Monte Carlo method was used to simulate dierent 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.