Tribology International

Raw Data and data used to plot graphs in the attached manuscript.

The program was developed in order to enable investigations of how surface roughness relates to rolling contact fatigue. The goal of the program was only to enable simulations of artificial asperities, indents, and general rough surfaces, not to write a program that would be easy to use nor to be the fastest or the most robust one. However, since the code is capable of simulating time-dependent thermal elastohydrodynamic contacts including different surface roughness’s it might be of use for others. The code is therefore distributed as an open-source code free to use for anyone. The author does not take any responsibility for the code. Some example files are included in order for future uses to get started easier and to show the validity of the code.

Data associated to the figures in "Wear Performance of Incoloy 800HT and Inconel 617 in Various Surface Conditions for High-Temperature Gas-Cooled Reactor Components"

This data provides the raw and processed film thickness measurement results from a bespoke journal bearing test platform. Lubricant film thickness has been determined in the present work via a range of ultrasonic techniques, observing changes in signal amplitude, phase and resonant frequency. Test cases include steady state shaft-aligned, shaft-misaligned and shut-down operating conditions. Film thickness results are compared against the Raimondi-Boyd theoretical prediction model and gap sensor measurements. Please consult the corresponding research article "Circumferential Film Thickness Measurement in Journal Bearings via the Ultrasonic Technique" for more information and detail relating to this data set.

Pin and roughness profile data that was used in the article: Sensitivity of the Stribeck curve to the pin geometry of a pin-on-disc tribometer

(1) Data For the Figures contains all the data needed in the manuscript; In addition, in order to facilitate interested readers to further understand the frictional vibration of the rubber bearing and the torsional vibration of the shaft, we also uploaded some cases in (2) and (3). If you still need relevant data, please feel free to contact us.

.xyz files of the optimized structures

The zip file contains the Python implementation of the machine learning algorithm presented in the manuscript titled "Learning acoustic emission signatures from a nanoindentation-based lithography process: Towards rapid microstructure characterization". Additional details are provided in the zip fie.

The research data included: 1. Hardness and elastic modulus of the coated tools 2. Optical microscopy of coated tool at various cutting distances 3. The 3D model and surface profile of AlTiN-based coated tools 4. EDS date

Data from a single asperity passing through a thermal elastohydrodynamic, TEHL, contact. The aim of the simulations is to clarify the loading conditions of asperities passing through thermal elastohydrodynamic lubricated contacts. The Figs 10 to 14 in C.-M. Everitts and B. Alfredssons article ‘Surface initiation of rolling contact fatigue at asperities considering slip, shear limit and thermal elastohydrodynamic lubrication’ was derived from the uploaded data. The numerical method used to obtain the data along with all input parameters used is presented in that article. The uploaded dataset contains two zip files containing data from one simulation each. The loading conditions were the same for both simulations except for the speed of the surfaces. In the first file, the speed of the surface with the asperity was 8 m/s while in the second zip file the speed of the asperity surface was 9 m/s. Note that the mean entrainment speed was 8.5 m/s in both simulations yielding different slip conditions for the two data sets. Each zip file contains the data from one TEHL-simulation divided into four separate results files. One data file contains the pressure, one the film thickness, one the temperature of the lubricant and the last the temperature of the metal body with the asperity. Each file contains the data from 3 steps where the grid size was gradually refined, then 10 steps when the time dependence was gradually introduced. Thereafter it is 514 time steps containing the information of the loading of the asperity as it passed through the TEHL contacts. Included in the folder is also a Matlab script reading and visualizing the data. The structure of the files is that the data from each simulation step is added after each other. For the pressure, the film thickness and the temperature of the lubricant each row represent the transverse direction and each column represents the rolling direction. The first row of each step contains the location of the nodes in the transverse direction and the first column contains the data of the nodes in the rolling direction. The structure of the metal temperature is such that each step contains the temperature of 39 layers. For each layer, the structure is the same as for the files mentioned before, with the rows representing the transverse direction and the columns the rolling direction, and the first row and column containing information about the node positions. For the spacing in the vertical direction, the reader is referred to the article ‘Surface initiation of rolling contact fatigue at asperities considering slip, shear limit and thermal elastohydrodynamic lubrication’ by C.-M. Everitt and B. Alfredsson.