The influence of selected factors on the strenght of wood adhesive joints

This paper examines the effect of selected factors on the wood bonded joint strength. The structural factor under scrutiny was the geometry of the surface area; however, other major dimensions of adherends were compared as well. The tests were per-formed on 6 joint types: butt, v-shaped, interlocking, scarf, tongue & groove, and single lap joints, which were formed on two types of substrate materials – pine and oak wood, and adhesively bonded. The joints were bonded with Prefere 6312 wood adhesive and Loctite 3430 two-component epoxy adhesive. Strength testing of the joints was performed on Zwick/Roell Z150 material testing machine, according to DIN EN 1465 standard. The results obtained from the tests indicate that bonded joints of oak wood exhibit higher strength properties than those of pine wood adherends, which was confirmed in nearly all strength tests

Friction and wear properties of nano-Si<inf>3</inf>N<inf>4</inf>/nano-SiC composite under nanolubricated conditions

Friction and wear properties of nano-Si3N4/nano-SiC composite were studied under nanolubricated conditions. Mineral oil mixed with nanoparticles of diamond was used as lubricant. A friction coefficient of 0.043 and a wear coefficient of 4.2×10-7 were obtained for nano-Si3N4/nano-SiC composite under normal load of 600 N with mineral oil + 0.5 wt% nanodiamond, whereas a friction coefficient of 0.077 and a wear coefficient of 10.3×10-7 were obtained for nano-Si3N4/nano-SiC composite under normal load of 600 N with mineral oil. 3D surface profilometer was used to study the surface morphology of wear scars. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) studies were conducted to illustrate reduction in friction and wear

Preface

Engineering ceramics are recently becoming more attractive and the number of various applications in industry is slightly but steadily increasing. The wider use of engineering ceramics is related to their multifunctional character which made them interesting for particular applications compared to other classes of materials. Therefore, data on catalytic, optical, electrical and/or thermal properties are important beside the typical characteristic values of the mechanical properties, such as strength, hardness or fracture resistance. The advanced research workshop Engineering Ceramics 2007 held in Smolenice Castle, Slovakia, from 6 to 10 May 2007 with the subtitle: From engineering to functionality fully confirmed this trend. The workshop was focused on recent advances in ceramic research as well as in their usage in industry. Lectures given by academics as well as researchers from industry gave insights in research on nano-ceramics, ultrahigh temperature materials and multifunctional materials. Especially contributions from industry demonstrated the high potential of multifunctional ceramic materials for applications in the automotive and engineering area. The total number of participants was restricted to 80 and allowed intensive discussions within the one session programme. Close interactions between participants were further stimulated by the relatively large number of industry people (15%), but also by the attractive ambience of Smolenice Castle. A part of the programme was dedicated to Rowland Morell Cannon, one of the best known ceramists in the world, who passed away suddenly and unexpectedly in April 2006. As a Research Engineer, Lecturer and Staff Scientist at the University of California, Berkeley and the Lawrence Berkeley National Laboratory, he engendered the respect, trust and affection from a wide network of colleagues and collaborators across the globe. R.M. Cannon participated in the past several times at our workshop on Engineering Ceramics in Smolenice Castle and made strong contributions with his profound understanding to give us new insights into the mechanical behavior and microstructure evolution in ceramics. The extraordinary impact of his research in the thermodynamics, processing and structural properties of ceramics as well as his strong personality was emphasized by Richard Brook. Further lectures covering the character, stability and properties of interfaces for ceramics and their role in microstructure development and mechanical behavior were given by former collaborators

Analysis of brake system damage in vehicles municipal communication in Lublin in the years 2011-2015

Celem artykułu jest analiza liczby uszkodzeń układu hamulcowego. Wstępnym etapem są analizy statystyczne opisujące częstotliwość pojawiania się uszkodzeń tego układu. W niniejszym artykule autorzy przedstawili wyniki takiej analizy dla wybranej grupy autobusów eksploatowanych przez Miejskie Przedsiębiorstwo Komunikacji w Lublinie. Analizę statystyczną uszkodzeń układu hamulcowego przeprowadzono w okresie od 2011 do 2015 roku dla grupy pojazdów marki Jelcz M121M.The aim of this article is to analyze the number of damage to the braking system. The preliminary stage is the statistical analysis describing the frequency of occurrence of damage of this system. In this article the authors present the results of this analysis for the selected group of buses operated by Municipal Communication Company in Lublin. A statistical analysis of damage to the braking system was carried out in the period from 2011 to 2015 for the group of vehicles Jelcz M121M

Temperatures during the dry cutting of titanium alloy using diamond composites with ceramic bonding phases

In this paper the thermal properties of diamond composites with ceramic bonding phases, such as the Ti–Si–C system with nanometric Ti(CN) and TiB₂ are presented. The thermal conductivities of the materials were analyzed by the laser pulse method. In addition, computational simulations of the temperature dependence on the distance from the cutting edge were performed according to the finite element method for the investigated composites, commercial PCD, and hypothetical diamond monocrystal.Досліджено теплові властивості алмазних композитів з керамічними зв’язуючими фазами, таких як системи Ti–Si–C з нанометровим Ti(CN) і TiB₂. Теплопровідності матеріалів проаналізовано за допомогою методу лазерного імпульсу. Крім того, методом скінченних елементів виконано числове моделювання залежності температури від відстані до ріжучої кромки для досліджених композитів, комерційного PCD і гіпотетичного монокристалу алмазу. Розглянуто дві швидкості різання в ході числового обчислення: 100 і 200 м/хв.Исследованы тепловые свойства алмазных композитов с керамическими связующими фазами, таких как системы Ti–Si–C с нанометровым Ti(CN) и TiB₂. Теплопроводности материалов проанализированы с помощью метода лазерного импульса. Кроме того, методом конечных элементов выполнено числовое моделирование зависимости температуры от расстояния до режущей кромки для исследованных композитов, коммерческого PCD и гипотетического монокристалла алмаза. Рассматривали две скорости резки в ходе числового вычисления: 100 и 200 м/мин