Tribologia - Finnish Journal of Tribology <p>An open access journal publishing both practical and scientific articles related to tribology: wear, friction and lubrication.</p> <p>Benefits to Authors:</p> <ul> <li class="show">No publication fees</li> <li class="show">Authors remain as copyright owners</li> <li class="show">Peer reviewed publishing process</li> <li class="show">Prompt publishing</li> <li class="show">Free printed copy for the corresponding author</li> </ul> <p>The flyer of the journal can be downloaded in pdf-form by clicking the picture below:</p> <p><a href="" target="_blank" rel="noopener"><img src="blob:" alt="" /></a></p> en-US <p>The authors of the publication retain the copyrights and the author can publish the article also in other media, such as in her/his PhD thesis or open access databases, such as ResearchGate.</p> <p>The license of the published metadata is Creative Commons CC0 1.0 Universal (CC0 1.0).</p> (Vuokko Heino) (Janne Juoksukangas) Thu, 16 Dec 2021 16:11:45 +0200 OJS 60 Tribological studies of different bioimplant materials for orthopedic application using Taguchi experimental design <p>In this research ball on disc wear tests have been carried out with ASTM G-99 standard at room temperature in simulated body fluid. The tribological property such as the coefficient of friction and wear weight loss was studied by using the Taguchi design of experiments. The design of the experiment was done using L8 orthogonal array to determine the collective contribution of the wear parameters. An analysis of variance demonstrated that the individual contribution of type of material factor was 97.15% and 66.66% for the coefficient of friction and wear weight loss respectively, which is the highest individual contribution as compared to other factors. It was concluded that the coefficient of friction and wear weight loss is mainly influenced by type of material factor. The analysis of the signal-to-noise ratio shows that the optimal coefficient of friction and wear weight loss was obtained with CoCrMo material at an applied normal load of 5 N with a sliding velocity of 0.05 m/s for a track diameter of 30 mm. To check the accuracy of results a confirmation test was carried out which indicates that predicted values are very close to the experimental values and the model is significant to predict the coefficient of friction. The results showed that the coefficient of friction and wear weight loss increases with increasing the applied load and sliding velocity. The microstructure of all substrates materials was analyzed using a scanning electron microscope. Wear track study showed that adhesive dominant wear mechanism for all four different substrate materials.</p> Sachin Solanke, Vivek Gaval Copyright (c) 2021 Sachin Solanke, Vivek Gaval Thu, 16 Dec 2021 00:00:00 +0200 Wear and Friction properties of H-Al-17Si alloy with dry, lubrication and coated (DLC-Star) conditions under HFRR <p>Dry, lubrication (SAE15W40), and coated (DLC-Star) reciprocating tribological tests on rapid solidified AlSi17Cu3.5-4Mg0.6-0.8 alloy was conducted using a high frequency linear reciprocating rig (HFRR) at ambient temperature. The alloy fabricated with the rheo-stir squeeze casting procedure under T-6 condition. However, at different loading (0-30 N) conditions, wear and friction properties of rapid solidified H-Al-17Si<strong> </strong>alloy are investigated. It is observed that the lower friction coefficient value obtained for DLC-Star coated H-Al-17Si<strong> </strong>alloy compared to dry and lubrication conditions. Though, for dry and lubricated sliding, the obtained wear coefficient values are 2.9X10-3 mm<sup>3</sup>/N.m and 4.0X10-4 mm<sup>3</sup>/N.m. A lower coefficient of wear value of 5.4X10<sup>-5</sup> mm<sup>3</sup>/N.m was recorded with DLC-star coating under dry conditions. The alloy wear coefficient values first increases with applied load (up to 20 N) and then decreases (20 N to 30 N). EDS, AFM surface roughness profilometer, SEM, and advanced metallurgical microscope (AMM) analysis techniques used for the characterization of surface morphologies. The developments in friction and wear coefficients were fundamentally ascribed to the dispersion and size of primary Si elements and the development of tribo-oxide films on the rapid solidified AlSi17 alloy coated (DLC-Star) surfaces.</p> N.D. Malleswararao.K, I.N. Niranjan Kumar, BH. Nagesh Copyright (c) 2021 N D MALLESWARARAO K, I.N. Niranjan Kumar, BH. Nagesh Thu, 16 Dec 2021 00:00:00 +0200 Study on Solid Particle Erosion of Pump Materials by Fly Ash Slurry using Taguchi’s Orthogonal Array <p>Various grades of stainless steel are used to fabricate the pump impeller, casings, and seals used in heavy-duty erosion and corrosion conditions. In the present study, stainless steel (SS316L, SS304, SDSS2507) and grey cast iron used in the fabrication of heavy-duty pump impellers were taken for the analysis of solid particle erosion. Experiments were conducted on the lab-scale slurry pot tester. Fly ash slurry was prepared of different concentrations (wt%). Taguchi’s orthogonal array is used to design the experiments of erosion wear for the variation of rotational speed, solid concentration, time, and particle size. Results showed that SS316L showed superior microhardness and wear behavior against the fly ash slurry followed by SS304, SDSS2507 and Grey cast iron.</p> <p class="Abstract" style="line-height: 200%; margin: 0cm 14.45pt .0001pt 0cm;"><span lang="EN-US" style="font-size: 12.0pt; line-height: 200%;"> </span></p> Jashanpreet Singh, Satish Kumar, S.K. Mohapatra Copyright (c) 2021 Jashanpreet Singh, Satish Kumar, S.K. Mohapatra Thu, 16 Dec 2021 00:00:00 +0200 Inhibition Evaluation of 5-(4-(1H-pyrrol-1-yl)phenyl)-2-mercapto-1,3,4-oxadiazole for the Corrosion of Mild Steel in an Acidic Environment: Thermodynamic and DFT Aspects <p>In this investigation, an oxadiazole namely 5-(4-(1H-pyrrol-1-yl)phenyl)-2-mercapto-1,3,4-oxadiazole (PMO), was synthesized and explored as an inhibitor against the corrosion&nbsp; of mild steel in 1.0 M hydrochloric acid environment at various solution temperature 303-333 K. gravimetric, and microscopic techniques, namely, weight loss (WL), and scanning electron microscopy (SEM), have been used to evaluate the inhibitive performance of the tested PMO. The results of the WL method displayed that the inhibition efficiency (%IE) was found to increase with the inhibitor concentration, while it reduced with increasing temperature. Furthermore, the WL results reveal that PMO inhibits corrosion display an IE of 95% at the highest concentration of 0.005 M. The SEM images of the mild steel surface coupon after adding PMO revealed a wide coverage of PMO molecules on the mild steel surface. Hence, the high inhibiting efficiency acquired by the tested inhibitor was explained by the strong adsorption of PMO molecules on the surface of mild steel. A protective layer has been constructed and it separating the mild steel surface from the hydrochloric acid solution, and such adsorption was found to obey Langmuir adsorption isotherm. Moreover, the thermodynamic parameters suggested that the adsorption nature of PMO molecules on the coupon surface was chemo-physisorption. Quantum chemical calculations were conducted by density functional theory (DFT) which help correlate the methodological findings with the theoretical investigations. The mechanisms of PMO molecules as corrosion inhibitor for mild steel surface in the corrosive environment was also discussed.</p> A. M. Mustafa, F. F. Sayyid, N. Betti, M. M. Hanoon, Ahmed Al-Amiery, A. A. H. Kadhum, M. S. Takriff Copyright (c) 2021 A. M. Mustafa, F. F. Sayyid, N. Betti, M. M. Hanoon, Ahmed Al-Amiery, A. A. H. Kadhum, M. S. Takriff Thu, 16 Dec 2021 00:00:00 +0200 Effect of Boron Carbide on wear resistance of graphite containing Al7029 Based Hybrid Composites and its Dry Sliding Wear Characterization Through Experimental, Response Surface Method and ANOVA <p>Composites are often chosen for tribological applications due to its tailored material properties. The development of hybrid metal matrix composites and the study of their wear behavior has been a prominent focus of materials science research. Present paper deals with fabrication of Al-7029/B<sub>4</sub>C/Gr hybrid composite using stir casting. Particle distribution and material phase are identified by SEM and XRD. Hardness of the composite increased to 101 BHN while base alloy with 63 BHN. Pin-on-disc Tribometer used to carry wear test and the experimentation conducted by considering three input wear control parameters: 15–35 N (load), 1.5–3.5 m/s (speed) and 200–600 m (distance). Addition of 6%B4C/3%Gr, wear rate of hybrid composites reduced. ANOVA confirmed that load as the most influencing parameter on wear rate. RSM results correlates with mean effect plots of ANOVA and experiments and found that the results are in good compliance. SEM graphs of worn surface confirms that more wear occurred with increased load.</p> Madhu K S, Venkatesh C V, Sharath B N, Karthik S Copyright (c) 2021 Madhu K S, Venkatesh C V, Sharath B N, Karthik S Thu, 16 Dec 2021 00:00:00 +0200 Development of damage detection parameters over the lifetime of a rolling element bearing <p>This paper presents the trends of damage detection parameters over the lifetime of a rolling element bearing. In the experimental part, a series of bearing tests was performed using the twin-disc test device, until the monitored bearing was severely worn. This was followed by the analysis of measured acceleration and acoustic emission data in a constant-load condition, but also as loaded with impact-type loading. The results showed that traditionally used parameters, such as kurtosis and RMS, can indicate whether the bearing is damaged or not in a non-impact load condition. However, especially under impact-loading, the parameters based on acoustic emission data showed good performance and enabled monitoring of progress of the bearing damage.</p> Matti Savolainen, Arto Lehtovaara Copyright (c) 2021 Matti Savolainen, Arto Lehtovaara Thu, 16 Dec 2021 00:00:00 +0200 Overview of recent dissertations in the field in Finland <p>An overview of recent dissertations in the field of tribology in Finland: Oskari Haiko, M. Erkin Cura.</p> - - Copyright (c) 2021 Oskari Haiko, M. Erkin Cura Thu, 16 Dec 2021 00:00:00 +0200 Foreword No 3−4 (2021) <p>Dear Readers,</p> <p>We are hoping that you have had successful year. It is almost the end of the year 2021, and we are happy to deliver You our latest issue.</p> <p>Next year will be our 40<sup>th</sup> anniversary, it is time for celebrations and also have some overview on the history of Tribologia during forthcoming issues. The story has began in the year 1982, when the Finnish Society for Tribology started publishing Tribologia. The very first Editor-in-Chief was Dr. Eng Heikki Sundqvist. During the years, the editorial work has been changed a lot with the assistance of several different software which enables faster editorial process with significant help for example in pre-evaluation of the papers before the actual reviewing process. However, this also means that authors are also expecting faster approach. We are constantly developing our processes towards more smooth operation which is also very useful mode in operation of many tribological components. Finnish Association for Scholarly Publishing has granted our journal for improving the electronic publishing.</p> <p>We hope that we will be able to organize 40<sup>th</sup> Anniversary Seminar during the next year either as live event or hybrid mode seminar. The announcement of the seminar will be given in the early 2022.&nbsp;&nbsp;</p> <p>We have received many interesting studies related to tribology from our valuable authors. We would like to also thank our reviewers for their valuable work for evaluating our publishing work.&nbsp;</p> <p>We hope that you have relaxing holiday season and enjoy reading our latest issue!</p> <p>Vuokko Heino<br>Editor-in-Chief</p> Vuokko Heino Copyright (c) 2021 Vuokko Heino Thu, 16 Dec 2021 00:00:00 +0200