Research Papers: Contact Mechanics

Effect of Crack Patterns on the Stress Distribution of Hard Chromium Coatings Under Sliding Contact: Stochastic Modeling Approach

[+] Author and Article Information
Nicolas S. Fochesatto

Department of Engineering,
Universidad Nacional del Sur;
Bahía Blanca 8000, Argentina
e-mail: nicolas.fochesatto@uns.edu.ar

Fernando S. Buezas

Department of Physics,
Universidad Nacional del Sur;
Bahía Blanca 8000, Argentina

Marta B. Rosales, Walter R. Tuckart

Department of Engineering,
Universidad Nacional del Sur;
Bahía Blanca 8000, Argentina

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 23, 2016; final manuscript received February 14, 2017; published online June 7, 2017. Assoc. Editor: Sinan Muftu.

J. Tribol 139(6), 061401 (Jun 07, 2017) (10 pages) Paper No: TRIB-16-1294; doi: 10.1115/1.4036181 History: Received September 23, 2016; Revised February 14, 2017

In this work, the influence of different crack arrangements in the stress distribution of hard chromium (HC) coatings was determined. Three parameters for position and length of the cracks for two different types of coatings were probabilistically modeled based on measured scanning electron microscopy (SEM) images. Probability density functions (PDF) for those parameters were obtained to characterize each kind of coating. A two-dimensional finite element (FE) model of the coating in contact with a rigid disk was developed, modeling 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 (SIFs) were taken as comparative parameters of the results. Coatings which statistically present larger quantities of shorter cracks have lower values of J-integral and SIFs, and, therefore, distribute stresses better than those with low density of longer cracks.

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Fig. 1

Cross-sectional SEM micrographs of samples: (a) conventional chromium plating bath sample and (b) nonfluoride catalyst-containing chromium plating bath sample

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Fig. 2

Sketch of parameters of crack distribution

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Fig. 3

Histograms and fitting distributions for S1 samples

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Fig. 4

Histograms and fitting distributions for S2 samples

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Fig. 5

Geometry created in FE software (coordinate axes in mm): (a) domain geometry and (b) crack geometry and mesh

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Fig. 6

Ball-on-cylinder configuration for COF estimation

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Fig. 8

Geometry of the crack distribution for a realization: (a) sample S1 and (b) sample S2

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Fig. 9

PDF of studied variables at different times

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Fig. 10

Evolution of PDFs of the studied variables

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Fig. 11

Evolution of mean and 95% envelope of the studied variables



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