Tribologia - Finnish Journal of Tribology <p>An open access&nbsp;journal publishing both practical and scientific articles&nbsp;related to tribology: wear,&nbsp;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><img src="/public/site/images/jannej/flyer_2019_image.png"></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) Fri, 04 Jun 2021 09:32:57 +0300 OJS 60 Overview of recent dissertations in the field in Finland <p>An overview of recent dissertations in the field of tribology in Finland.</p> -- Copyright (c) 2021 -- Fri, 04 Jun 2021 00:00:00 +0300 Wear and corrosion interaction of AISI D2 in an acidic environment <p>The tribological, electrochemical and tribo-electrochemical behavior of bare AISI D2 was studied. The tribological aspects were tested by pin on disc with an aluminum oxide ball as counter body, the electrochemical tests were performed in an aqueous solution of citric acid and the tribo-electrochemical evaluation was through a combination of both tests. AISI D2 steel presented abrasive wear in dry and wet conditions, such type of wear occurred due to stick-slip motion, moreover, in wet conditions the alloy corroded at corrosion current values around 10<sup>-6 </sup>A/cm<sup>2</sup><sub>.</sub><sup> </sup>The damage produced over the wear track was larger under wet conditions than for the dry conditions.</p> Tania Garcia, Andreas Zeinert, Stephen Muhl , Michaël Lejeune Copyright (c) 2021 Tania Garcia, Andreas Zeinert, Stephen Muhl , Michaël Lejeune Fri, 04 Jun 2021 00:00:00 +0300 The analysis of fretting fatigue in forced-in joint with the induction-hardened shaft <p>Subject to the analysis was a tribological kinematic pair consisting of shaft and sleeve, both made of C45 steel. The elements were joined by pressing with the 0.02 mm tolerance. The shaft was subjected to the finishing and strengthening treatment consisting in induction hardening. The tribological kinematic pair made in such way was tested on a fatigue testing machine, which permitted obtaining a rotational bending moment.</p> <p>Macroscopic investigations of the unhardened shaft demonstrated, on the shaft surface, the traces of fretting wear in the form of a ring of the uniform width comprising the entire axle seat circumference.</p> <p>Based on the test results, it may be concluded that the use of the shaft induction hardening process has caused the reduction of fretting wear development compared to shafts without additional treatment. In this case, Wear traces in the form of small diameter ring comprising the entire shaft circumference are observed on one side of the shaft axle seat.</p> Sławomir Kowalski Copyright (c) 2021 Sławomir Kowalski Fri, 04 Jun 2021 00:00:00 +0300 Mechanical and the effect of oil absorption on tribological properties of carbon-based brake pad material <p>This research focuses on the mechanical and effect of oil absorption on the tribological properties of carbon-based brake pad material (CBP). Carbon-based materials, including those at a nanosize, are combined for developed brake pad material. The mechanical properties related to wear properties such as compression strength, stiffness, hardness, and absorption properties were determined. The effect of oil absorption on the tribological properties of carbon-based materials was investigated. The obtained properties are compared with that of a ceramic-made brake pad (commercial). The experimental results show that the mechanical and absorption properties of the developed brake pad material varied with the combination and quantity of additives used to develop each brake pad material. CBP material offered higher performance than ceramic-made brake pads. The CBP material showed a higher shear strength of about 110%, 51% enhanced compressive strength, 35% greater modulus, comparative statistical hardness, 98% lesser water intake, and 97% oil absorption rate than ceramic made brake pad. The tribological properties of friction material after soaked in oil proved that absorption properties affect tribological properties of brake pads, which can be attributed to the oil content in the material system. The effect of oil uptakes on wear rate and friction of the commercial brake pad was higher than CBP materials, implying that the loading of carbon-based materials is a viable way to reduce absorption rate, which helps in increasing brake pad performance. The improved properties are suggestive of materials combinations that may be used to develop brake pad materials.</p> Oluwatoyin Joseph Gbadeyan, T. P. Mohan, K. Kanny Copyright (c) 2021 Oluwatoyin Joseph Gbadeyan, T. P. Mohan, K. Kanny Fri, 04 Jun 2021 00:00:00 +0300 Study On Effect of Boron Carbide, Aluminium Oxide and Graphite On Dry Sliding Wear Behaviour of Aluminium Based Metal Matrix Composite at Different Temperature <p>The present research has been conducted to study the impact of boron carbide (B<sub>4</sub>C), aluminium oxide(Al<sub>2</sub>O<sub>3</sub>) and graphite on Aluminium 2219 (Al2219). According to current research, B<sub>4</sub>C and graphite material be a good substitute for Al2219.Reinforced composites and unreinforced Al2219 prepared by a stir casting process. A scanning electron microscope was used to analyze the reinforcement and distribution in the matrix and worn surface of the specimen. Exceptional wear resistance (30%) exhibited by B<sub>4</sub>C and graphite-reinforced hybrid composite at 150 ºC in contrast with the unreinforced Al2219. The B<sub>4</sub>C and Gr reinforcement particulate existence improves the strengthening kinetics in the matrix phase at 150 °C. The artificial neural network used to get the test significance, normalized factor importance and absolute relative error of less than 1%.</p> Sharath BN, Venkatesh C V Copyright (c) 2021 Sharath BN, Venkatesh C V Fri, 04 Jun 2021 00:00:00 +0300 Foreword No 1−2 (2021) <p>Dear Readers,</p> <p>We are hoping that you have had successful first half of this year. It is almost time for summer holidays, and we are happy to deliver you our latest issue.</p> <p>Our publishing work is enabled by the Finnish Society for Tribology. Our society also acknowledges the doctoral thesis published in the field of tribology. In this issue we are introducing the doctoral thesis by PhD Tommi Varis, who was also recently granted by our society. Congratulations to him!</p> <p>Since our latest issue, the Institution of Mechanical Engineers has awarded the Gold Medal for Tribology to Professor Bharat Bhushan. He has contributed five decades to improve our knowledge in tribology, being pioneer in the tribology of magnetic storage devices, bio-/nanotechnology, cosmetics and biomimetics, nanotribology and green tribology. All the best to Professor Bhushan.</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. 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.</p> <p>We hope that you stay safe and enjoy reading our latest issue!</p> <p><em>Vuokko Heino</em><br>Editor-in-Chief</p> <p>&nbsp;</p> Vuokko Heino Copyright (c) 2021 Vuokko Heino Fri, 04 Jun 2021 00:00:00 +0300