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19th International Union of Materials Research Societies - International Conference in Asia, IUMRS-ICA 2018

作者： Venkataraman, Mohanapriya Militký, Jiří Mishra, Rajesh Kremenakova, Dana Petru, Michal Technical University of Liberec Faculty of Textile Engineering Department of Material Engineering Liberec46117 Czech Republic Technical University of Liberec Faculty of Mechanical Engineering Department of the Design of Machine Elements and Mechanisms Czech Republic

Among many other materials for the reinforcement of composites, technical fabrics are increasingly being used, especially from glass tows, which have good mechanical properties. In this paper, glass fiber based tapes containing special types of resins, in pre-condensate form with application in technology of composites preparation by precise winding is prepared. Also, the selected suitable resin was loaded by suitable types of nanoparticles for enhancing mechanical properties. The tensile properties of the tapes made from glass were investigated. Measurements of resultant stabilized hybrid composite tapes (SHCT) were focused on the breaking force, deformation at break and initial modulus. It was found that the durability of the tapes was sufficient for long term storing. The main benefit was avoiding of resin penetration into winded structure which is due to tight arrangements of fibrous phase which is very complicated. The results show that SHCT can be stored and used after a longer period of time. © Published under licence by IOP Publishing Ltd.

关键词： Glass

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Hydromechanical automatic transmission

Communications - Scientific Letters of the University of Ži...

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Communications - Scientific Letters of the University of Žilina 2009年第2期11卷 33-35页

作者： Kucera, Lubos Lulac, Michal Jurak, Ladislav Brumercik, Frantisek Department of Design and Machine Elements Faculty of Mechanical Engineering University of Zilina Slovakia

This contribution describes some tests of hydromechanical infinitely variable transmission (IVT) on a test stand. Further, there is described a truck with installed IVT and tests of this IVT at real conditions. There ... 详细信息

关键词： Variable speed transmissions

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Influence of surface structure on film formation and friction coefficient of elastohydrodynamic contacts

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Tribologie und Schmierungstechnik 2009年第4期56卷 14-20页

作者： Mihailidis, A. Bakolas, V. Drivakos, N. Decker, P. Gatsios, S. Laboratory of Machine Elements and Machine Design Greece Laboratory of Machine Elements and Machine Design Department of Mechanical Engineering Aristotle University of Thessaloniki 54124 Thessaloniki Greece Schaeffler KG 91074 Herzogenaurach Germany

Wear and surface fatigue of elastohydrodynamic contacts are strongly affected by asperity collisions. Therefore, the transition from the full to the mixed lubrication regime is of particular interest. In order to quantify this transition, the solid contact time percentage is introduced in this study. It is obtained by an experimental technique based on a two-disk test rig that enables to determine whether asperity collisions occur or not. The influence of the surface finish on the elastohydrodynamic performance is investigated using several disk pairs with the same composite roughness but different surface micro-topography. Results are evaluated using both the solid contact time percentage and the friction coefficient. It is shown that significant improvement on the tribological behaviour can be achieved by properly selecting the surface finish. In this way, the need for special surface texturing can be eliminated in many cases.

关键词： Surface roughness

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An interactive design methodology for service engineering of functional sales concepts – A potential design for environment methodology 13

An interactive design methodology for service engineering of...

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13th CIRP International Conference on Life Cycle engineering, LCE 2006

作者： Lindahl, Mattias Sundin, Erik Sakao, Tomohiko Shimomura, Yoshiki Department of Mechanical Engineering Linköping University Sweden Institute for Product Development and Machine Elements Darmstadt University of Technology Germany Department of System Design Tokyo Metropolitan University Japan

ISBN: (纸本)905682712X

Manufacturing companies around the globe are striving to increase their revenues and profitability. One way is through Functional Sales, i.e. shifting the focus from the production of products to the production of services. Functional Sales and design for Environment (DfE) have many common issues, e.g. the life cycle perspective. The paper’s aim is to highlight a proposed interactive design method for Service engineering of Functional Sales offers and to relate this method to selected DfE methods and tools as well as users’ experiences with these methods and tools. The paper concludes that the proposed method has several benefits that are useful in DfE. One benefit is that the method does not focus on products but rather on how needs can be satisfied by increasing service content. Another is the visualization of e.g. validation in order to facilitate communication between different actors in the product development process. © 2006 Katholieke Universiteit Leuven. All rights reserved.

关键词： Life cycle

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Notch stress and fracture mechanics based assessment of fatigue of seam weld ends under shear loading

Notch stress and fracture mechanics based assessment of fati...

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作者： Shams, E. Malikoutsakis, M. Savaidis, G. Vormwald, M. Department of Civil and Environmental Engineering Material Mechanics Group Technische Universität Darmstadt Franziska-Braun-Straße 3 64287 Darmstadt Germany Department of Mechanical Engineering Laboratory of Machine Elements and Machine Design Aristotle University of Thessaloniki 54124 Thessaloniki Greece

Welding processes often lead to pronounced weld termination points (start/end), which are prone to fatigue events such as crack initiation. The fatigue of weld ends under shear loading, especially in thin sheet structures, is not sufficiently explored yet. In the present investigation, the real geometry of welds was obtained by scanning the three-dimensional surface, especially of weld ends. Cryogenic breaking of the weld opened the view to the weld root geometry and especially to the critical location, where the weld root migrates to a weld toe at the weld end. In the experimental part of this research, fatigue testing of thin sheet plane and cylindrical specimens as well as large components containing weld ends was performed. Based on the data, weld end life curves have been obtained. The notch stress concept and a fracture mechanics based approach were applied for describing the results of fatigue tests providing sufficient accuracy. © 2014 Wiley Publishing Ltd.

关键词： Welds

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The Above-ground Weighbridge

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Procedia engineering 2017年 192卷 52-57页

作者： Marek Bisták Štefan Medvecký Slavomír Hrček University of Zilina Faculty of Mechanical Engineering Department of Design and Machine Elements Univerzitna 2 Žilina 01026 Slovakia

This paper presents the layout of the about-ground weighbridge. There is requirement on the implementation of this device in order to re-measure the weight of the vehicles used for transportation of the steel waste collected to the collecting yard. The weighbridge is used wherever the vehicles must be weighed in order to not exceed the maximum permissible weight established in the legislation with regard to the transport of the goods by road. The advanced CAD / CAE systems used in the design and optimization contributed to carried out a number of modifications of the steel structure, reaching an ergonomic installation, weight saving, greater strength and rigidity of the structure when loaded.

关键词： Weighbridge Strain gauge FEM simulation

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Impact of backlash, manufacturing deviations and friction on the load sharing factor of planetary gear systems

Impact of backlash, manufacturing deviations and friction on...

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6th International BAPT Conference on Power Transmissions, PT 2019

作者： Mihailidis, Athanassios Moisiadis, Anastasios Psarros, Andreas Lab of Machine Elements and Machine Design School of Mechanical Engineering Faculty of Engineering Aristotle University of Thessaloniki Thessaloniki54624 Greece Department of Mechanical Engineering School of Technological Applications University of Applied Sciences of Cen-tral Macedonia Serres Greece

Techniques and software tools, which were recently introduced by the authors, allowed for effi-cient automatic generation of 3D gear flanks and selective meshing of the gears of a simple planetary gear system with backlash and manufacturing imperfections. Friction of the meshing gear flanks was neglected. First results were promising and showed that even in geometrically perfect planetary gear systems the torque distribution is not uniform. It was further verified that pitch errors have a strong impact on the load distribution and that a self-aligning sun gear significantly enhances the torque distribution among the planets. In the current study, the procedure mentioned above is enhanced in several aspects. First, the tooth friction is considered. The friction coefficient is assumed constant along the path of contact;however different values for the sun-planet and planet-ring gear mesh may be given to account for the different contact conditions. Second, deviations are generated between given limits in a stochastic way. This feature significantly reduces the time needed to setup a model. Third, the entire analysis procedure is further automated by extensively employing Python scripting, enabling the solution of successive snapshots in much shorter time. Besides the torque distribution among the planets, the mesh load factor Kγ and the deformation of the teeth, the planet bearing load is also shown. © 2019 The Authors, published by EDP Sciences.

关键词： Friction

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The Effect of External Forces on the Load Sharing of a Full Planet Engagement Planetary Gear Train 3

The Effect of External Forces on the Load Sharing of a Full ...

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3rd International Conference on Communications, Information, Electronic and Energy Systems, CIEES 2022

作者： Ivanov, Vladislav Aleksandrov, Angel Tsonev, Veselin Kuzmanov, Nikola Troha, Sanjin Dimitrov, Lubomir Technical University of Sofia Dept. of Machine Elements And Nonmetallic Constructions Sofia Bulgaria Technical University of Sofia Dept.of Mechanics Sofia Bulgaria Technical University of Sofia Department of Mechanics Sofia Bulgaria University of Rijeka Department of Mechanical Engineering Design Rijeka Croatia Technical University of Sofia Department of Machine Elements And Non-metallic Constructions Sofia Bulgaria

ISBN: (数字)9781665491495

ISBN: (纸本)9781665491495

The aim of the study is to experimentally investigate the effects of external forces on the load sharing characteristics of the full planet engagement gear train. This type of planetary gear trains has a high power density but due to the complexity of the planets' arrangement and the resulting specific assembly and adjacent conditions they are not widely used and there is very little known about the load distribution between the planets, especially in case of additional external loads applied to the gear train. To explore that influence a special test rig using a closed loop power flow is designed and manufactured allowing for the application of external load parallel to the torque applied. Low speed dynamic testing is conducted with different load scenarios and positions of the carrier. All data is acquired with strain gauges and the resulting bending stresses in the pins of the planets are calculated. The load sharing factor LSF is calculated for the planets and the results are presented graphically. © 2022 IEEE.

关键词： Electric load flow

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Fatigue assessment of stress peened leaf springs supported by microstructural surface analyses

Fatigue assessment of stress peened leaf springs supported b...

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3rd International Conference of engineering Against Failure, ICEAF 2013

作者： Savaidis, Georgios Karditsas, Stelios Savaidis, Alexander Stergioudi, Fani Michailidis, Nikolaos Aristotle University of Thessaloniki Department of Mechanical Engineering Laboratory of Machine Elements and Machine Design 54124 Thessaloniki Greece School of Pedagogical and Technological Education Dept. Mechanical Engineering Educators 14121 N. Heraklion Athens Greece Aristotle University of Thessaloniki Department of Mechanical Engineering Physical Metallurgy Laboratory 54124 Thessaloniki Greece

ISBN: (纸本)9789608810433

Taking high-performance parabolic steel leaves from serial springs used for the suspension of front axles of trucks as an example, the present paper focuses on the influence of the material, the heat treatment and the stress peening processes on the microstrucure, the surface properties (residual stresses, micro- and macro-hardness, roughness, decarburization zone and percentage) and, especially, the fatigue life of parabolic leaf springs. Hardnessess of the leaf core and surface, roughness profiles and residual stress profiles of both the stress peened and untreated leaf surfaces were determined to quantify the influence of the applied heat treatment and stress peening. Analytical calculations based on the FKM guideline were performed to evaluate every above mentioned fatigue life influencing factor. Comparison of the analytical results with the corresponding experimentally determined ones reveal the accuracy of the current theoretical tools.

关键词： Fatigue of materials

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Individual contour adapted functional implant structures in titanium 21

Individual contour adapted functional implant structures in ...

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21st CIRP design Conference: Interdisciplinary design, CIRP 2011

作者： Schoene, C. Stelzer, R. Sembdner, P. Markwardt, J. Reitemeier, B. Engel, G. Department of Mechanical Engineering Institute of Machine Elements and Machine Design Dresden University of Technology Dresden01062 Germany Department of Oral and Maxillofacial Surgery Department of Prosthethetic Dentistry Dresden University of Technology Dresden01062 Germany Product Development Company Hofmann and Engel GmbH in Boxdorf Near Dresden

ISBN: (纸本)9788989693291

Apart from applications in mechanical engineering, now even the domain of medicine may benefit from the option of using metallic materials for Direct Manufacturing. In the medical domain, the use of biocompatible materials, such as titanium or titanium alloys is essential to produce individual implants. As a result of this development, it is now possible to generate new patient-specific geometries fitted to the contour. This paper elucidates the process chain to derive individual design variants and to produce patient-specific bone replacement implants for the lower jaw-bone regions by using innovative reverse engineering and manufacturing methods. For this interdisciplinary project, technical scientists, medical scientists at the university hospital and engineers from a product development firm work together. © Proceedings of the 21st CIRP design Conference, Korea 2011: Interdisciplinary design. All rights reserved.

关键词： Reverse engineering

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