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5th International Conference of Engineering Against Failure, ICEAF-V 2018

作者： Tsakiris, Antonios Salpistis, Christos Mihailidis, Athanassios Aristotle University of Thessaloniki Faculty of Engineering School of Mechanical Engineering Laboratory of Machine Elements and Machine Design Thessaloniki54124 Greece

Additive Manufacturing (AM) has been widely considered a key factor for innovative design. However, the utilization of AM has not been as high as expected, although the technology offers key innovative design capabilities, weight reduction, parts count and assembly consolidation as well as material saving. This low utilization is attributed to the lack of AM understanding, mature CAE/CAM software tools addressing AM specific issues such as design support structure generation and removal, residual stresses, surface quality. In most cases, design for AM (DfAM) is a crucial requisite for a "design Right Once" approach. Such an approach is shown in the current study using three parts as example: an arthropod's leg, a gearshift drum and an electric motor mounting frame. The implementation of geometrical conformal lattice structures and lattices with variable density are discussed. A structured design approach is presented and design dilemmas are solved in terms of a DfAM approach. Primary design optimizations are evaluated. Weight reduction is considered throughout the design and free form surfaces are being used. "Freedom to design" principle is also portrayed and assembly parts consolidation occurs as a natural process of DfAM in comparison with previous design practices. It is concluded that, even from the primary design phase the design engineer can reveal his creativity because of the absence of constraints set by the traditional manufacturing technologies. © The Authors, published by EDP Sciences, 2018.

关键词： 3D printers

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Parametric design and Finite Element Analysis of metallic tanks transporting dangerous goods 5

Parametric design and Finite Element Analysis of metallic ta...

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5th International Conference of Engineering Against Failure, ICEAF-V 2018

作者： Sykaras, Konstantinos Malikoutsakis, Michail Loulas, Minas Mihailidis, Athanassios Aristotle University of Thessaloniki Faculty of Engineering School of Mechanical Engineering Laboratory of Machine Elements and Machine Design Thessaloniki54124 Greece

Metallic tanks are widely used for the transportation of dangerous goods. Manufacturers utilize standards in conjunction with European legislation concerning the international carriage (ADR and RID) to specify the minimum design and construction requirements. The analysis of the tank's attachment to the vehicle is not covered by analytical calculation methods, and only the Finite Element stress analysis can be used prior to manufacture. New ADR amendments demand that the certification authorities conduct stringent examinations that the manufacturer has the ability to perform high quality weldings. Applying the structural strength concept implemented in the International Institute of Welding (IIW) guidelines into the calculation is a protracted task. Aiming at speeding up the procedure, a parametric design and an efficient FE analysis is developed for a LGBF tank. Utilizing parametric design offers sufficient overview of the whole structure, while a supplementary surface model is generated to reduce pre-processing time. The tank is subjected to prescribed load cases, while the meshing directives of the structural hot spot stress concept (SHSSC) according to the IIW recommendations are incorporated in the procedure, in order to assess both the static and fatigue strength of the weld details. Using a multi-compartment LGBF tank as a case study, it is shown that the proposed detailed and automated analysis succeeds in reducing the time and effort needed, as well as in allocating the critical spots, substantially increasing the calculation accuracy. © The Authors, published by EDP Sciences, 2018.

关键词： Welding

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Micro/nano-structured TiO2 surface with dual-functional antibacterial effects for biomedical applications

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Bioactive Materials 2019年第1期4卷 346-357页

作者： Xiang Ge Chengzu Ren Yonghui Ding Guang Chen Xiong Lu Kefeng Wang Fuzeng Ren Meng Yang Zhuochen Wang Junlan Li Xinxin An Bao Qian Yang Leng Key Laboratory of Mechanism Theory and Equipment Design of Ministry of Education School of Mechanical EngineeringTianjin UniversityTianjin300354China Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongChina Center for Advanced Regenerative Engineering Northwestern UniversityEvanstonIL60208USA Department of Biomedical Engineering Northwestern UniversityEvanstonIL 60208USA Key Lab of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu610031China National Engineering Research Center for Biomaterials Sichuan UniversityChengdu610064China epartment of Materials Science and Engineering Southern University of Science and TechnologyShenzhenGuangdong518055China State Key Laboratory of Precision Measuring Technology and Instruments Tianjin UniversityTianjin300072China School of Humanities Tianjin Agricultural UniversityTianjin300384China Department of Machine Elements and Engineering Design University of KasselKassel34125Germany

Implant-associated infections are generally difficult to cure owing to the bacterial antibiotic resistance which is attributed to the widespread usage of *** the global threat and increasing influence of antibiotic resistance,there is an urgent demand to explore novel antibacterial strategies other than using ***,using a certain surface topography to provide a more persistent antibacterial solution attracts more and more ***,the clinical application of biomimetic nano-pillar array is not satisfactory,mainly because its antibacterial ability against Gram-positive strain is not good ***,the pillar array should be equipped with other antibacterial agents to fulfill the bacteriostatic and bactericidal requirements of clinical ***,we designed a novel model substrate which was a combination of periodic micro/nano-pillar array and TiO2 for basically understanding the topographical bacteriostatic effects of periodic micro/nano-pillar array and the photocatalytic bactericidal activity of *** innovation may potentially exert the synergistic effects by integrating the persistent topographical antibacterial activity and the non-invasive X-ray induced photocatalytic antibacterial property of TiO2 to combat against antibiotic-resistant implant-associated ***,to separately verify the topographical antibacterial activity of TiO2 periodic micro/nano-pillar array,we systematically investigated its effects on bacterial adhesion,growth,proliferation,and viability in the dark without involving the photocatalysis of *** pillar array with sub-micron motif size can significantly inhibit the adhesion,growth,and proliferation of Staphylococcus aureus(***)and Escherichia coli(***).Such antibacterial ability is mainly attributed to a spatial confinement size-effect and limited contact area availability generated by the special topography of pillar ***,the pillar array is not lethal to S

关键词： Titanium dioxide Micro/nano-structured surface Topographical bacteriostatic activity Photocatalytic bactericidal property Non-invasive treatment

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Micro product and process fingerprints for zero-defect net-shape micromanufacturing 19

Micro product and process fingerprints for zero-defect net-s...

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19th International Conference of the European Society for Precision Engineering and Nanotechnology, EUSPEN 2019

作者： Tosello, Guido Gulcur, Mert Whiteside, Ben Coates, Phil Luca, Antonio De Sousa Lia Fook, Pablo Vinícius Riemer, Oltmann Danilov, Igor Zanjani, Matin Yahyavi Hackert-Oschätzchen, Matthias Schubert, Andreas Baruffi, Federico Achour, Soufian Ben Calaon, Matteo Nielsen, Chris Valentin Bissacco, Giuliano Cannella, Emanuele Rasmussen, Anette Bellotti, Mattia Saxena, Krishna Qian, Jun Reynaerts, Dominiek Santoso, Teguh Syam, Wahyudin Leach, Richard Kose, Sandeep Kuria Parenti, Paolo Annoni, Massimiliano Cai, Yukui Luo, Xichun Qin, Yi Zeidler, Henning Department of Mechanical Engineering Technical University of Denmark Kgs. Lyngby Denmark RKT Centre for Polymer MNT Faculty of Engineering and Informatics University of Bradford Bradford United Kingdom Laboratory for Precision Machining Leibniz Institute for Materials Engineering IWT University of Bremen Bremen Germany Chemnitz University of Technology Professorship Micromanufacturing Technology Chemnitz Germany IPU Kgs. Lyngby Denmark Department of Mechanical Engineering KU Leuven Member Flanders Make Leuven Belgium Manufacturing Metrology Team University of Nottingham Nottingham United Kingdom Mechanical Engineering Department Politecnico di Milano Milano Italy Centre for Precision Manufacturing Design Manufacture and Engineering Management University of Strathclyde Glasgow United Kingdom Institute of Machine Elements Design and Manufacturing Professorship for Additive Manufacturing TU Bergakademie Freiberg Freiberg Germany Beckmann-Institut für Technologieentwicklung Chemnitz Germany

ISBN: (纸本)9780995775145

Highly miniaturized systems find applications in key technological fields such as health-care, mobility, communications and optics. Required innovations for precision manufacturing of micro components can be achieved through post-process and in-process measurement of process input and output parameters. Hence, it is of critical importance to reduce the measurement and optimization effort, since process and product quality control can take a significant part of the production time in micro manufacturing. To solve this challenge, research is undertaken in order to define, investigate, implement and validate the "Product/Process Micro Manufacturing Fingerprint" concept. In particular, in the Horizon2020 Innovative Training Network "Process Fingerprint for Zero-defect Net-shape MICROMANufacturing", 9 beneficiaries and 14 industrial partners are collaborating to establish this concept for several manufacturing technologies, such as micro injection and micro ultrasonic moulding, micro mechanical and micro plasma polishing, micro electrical discharge machining, micro electrochecmical machining, micro grinding, micro laser machining, micro extrusion, micro metrology, micro sintering. The project has reached its goals of developing novel methods in micro scale manufacturing process monitoring and control, as well as micro and sub-micro product quality assurance. The overall result has been the establishment of effective micro product and process fingerprints for the considered manufacturing technologies. © 2019 European Society for Precision Engineering and Nanotechnology, Conference Proceedings - 19th International Conference and Exhibition, EUSPEN 2019. All rights reserved.

关键词： Quality assurance

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Load carrying capacity of a heterogeneous surface bearing

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Friction 2015年第4期3卷 287-293页

作者： Evan THOMAS Mircea D PASCOVICI Romeo P GLOVNEA Tribology Laboratory Department of Engineering and DesignUniversity of SussexUnited Kingdom Machine Elements and Tribology Division Politehnica University of BucharestBucharestRomania

It has been shown before that liquids can slip at a solid boundary,which prompted the idea that parallel-surfaces bearings can be achieved just by alternating slip and non-slip regions in the direction of fluid *** amount of slip at the wall depends on the surface tension at the liquid-solid interface,which in turn depends on the chemical state of the surface and its *** the present study a heterogeneous surface was obtained by coating half of a circular glass disc with a coating repellant to glycerol.A rotating glass disc was placed at a known/calibrated distance and the gap was filled with *** the mobile surface moving from the direction of slip to non-slip region it can be theoretically shown that a pressure build up can be *** pressure gradient in the two regions is constant,similar to that in a Rayleigh step bearing,with the maximum pressure at the separation *** heterogeneous disc was placed on a holder supported by a load cell thus the force generated by this pressure increase can be measured *** were carried out at different sliding speeds and gaps and the load carried was measured and subsequently compared with theoretical *** allowed the slip coefficient to be evaluated.

关键词： bearing slip heterogeneous load

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Fatigue assessment of thin-welded joints with pronounced terminations

Fatigue assessment of thin-welded joints with pronounced ter...

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作者： Malikoutsakis, M. Savaidis, G. Department of Mechanical Engineering Laboratory of Machine Elements and Machine Design Aristotle University of Thessaloniki 54124 Thessaloniki Greece

The present paper reviews and contains simple modifications to extend the applicability of global and local fatigue concepts to thin-welded specimens with pronounced weld terminations (starts/ends). Experimental fatigue data reported by Kaffenberger and Vormwald have been used for the validation of the proposed procedures. Special attention is paid to the notch strain concept. The material state is explicitly considered by means of corresponding strain-life curves in conjunction with PSWT, PMorrow or the experimental mean stress sensitivity factors proposed by Olivier. The accuracy of Neuber's sharp and mild notch formulas, Seeger-Beste's formulation and Glinka's strain energy density rule within the context of the notch strain approach has been investigated. Simple rules accounting for stress relaxation effects have been additionally proposed and implemented into the calculations. Comparison of experimental with theoretical fatigue lives validates the accuracy and robustness of the proposed procedures to calculate fatigue design S-N curves. © 2014 Wiley Publishing Ltd.

关键词： Welds

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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 Effect of Heat and Surface Treatment on the Fatigue Behaviour of 56SiCr7 Spring Steel

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Procedia Engineering 2014年 74卷 309-312页

作者： Roselita Fragoudakis Stelios Karditsas Georgios Savaidis Nikolaos Michailidis Tufts University Department of Mechanical Engineering Medford MA 02155 USA Aristotle University of Thessaloniki Department of Mechanical Engineering Laboratory of Machine Elements & Machine Design Thessaloniki 54124 Greece Aristotle University of Thessaloniki Department of Mechanical Engineering Physical Metallurgy Laboratory Thessaloniki 54124Greece

Heat and surface treatments of spring steels can greatly affect fatigue life by increasing the number of cycles to failure. Heating, quenching and tempering of spring steel will increase its fatigue limit, as tempered martensite formation with an appropriate surface hardness is achieved from an initial ferritic/perlitic microstructure. This study deals with the parameters of the manufacturing process to transforming the initial microstructure of 56SiCr7 steel to tempered martensite, and increasing the surface hardness and fatigue resistance. Microscopy helps determine the decarburized surface layer thickness. Macro- and micro hardness measurements distinguish between core and surface microstructure hardness of the heat-treated steel. Shot-peening induces compressive residual stresses to the surface of the steel, therefore increasing its surface hardness and consequently the number of cycles to failure. This study shows significant hardness increase on the surface of the steel, and verifies how heat- treatment and shot-peening affect surface hardness. Experimental and analytically calculated (FKM guideline) S-N curves at 4- point cyclic bending quantify the individual effects resulting from the applied heat treatment and shot peening on fatigue life.

关键词： Heat Treatmen Shot-peening Tempering Spring Steel Microstructure Surface Hardness Fatigue Life

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Fatigue life assessment of thin welded joints based on local approaches

Fatigue life assessment of thin welded joints based on local...

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3rd International Conference of Engineering Against Failure, ICEAF 2013

作者： Malikoutsakis, Michail Savaidis, G. Aristotle University of Thessaloniki Department of Mechanical Engineering Laboratory of Machine Elements and Machine Design 54124 Thessaloniki Greece

ISBN: (纸本)9789608810433

The present paper examines the potential of applying the Notch Strain Approach to the fatigue assessment of thin welded joints. Detailed analysis of weld geometry along with the experimentally determined fatigue life curve 1, offering weld-end toe failures, is presented using various combinations of parameters for each step of the approach. The Effective Notch Stress Concept described within the IIW guideline2 and properly extended for application on weld-end locations1,3 is used in conjunction with Neuber's sharp and mild notch formulas4, Seeger-Beste formulation5 and Glinka's strain energy density rule6. The fundamental strain-life material curve in combination with the damage parameters after Smith-Watson-Topper7 and Morrow 8 or the mean stress sensitivity factors proposed by Olivier 9 are subsequently applied. The Parent Material, Weld filler Material and Heat Affected Zone are assessed separately with their corresponding ultimate tensile strength values being estimated from hardness measurements and the respective cyclic properties deriving from the Uniform Material Law 10.

关键词： Fatigue of materials

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design of heavy duty parabolic front leaf-springs with respect to kinematics and stress behavior

Design of heavy duty parabolic front leaf-springs with respe...

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3rd International Conference of Engineering Against Failure, ICEAF 2013

作者： Karditsas, S. Savaidis, G. Malikoutsakis, M. Aristotle University of Thessaloniki Department of Mechanical Engineering Laboratory of Machine Elements and Machine Design 54124 Thessaloniki Greece

ISBN: (纸本)9789608810433

The present paper deals with the influence of leaf-spring design parameters on axle kinematics and stress behavior. Parametrical studies on asymmetrical parabolic front mono-leaf springs for heavy duty vehicles were exemplarily performed considering the most significant driving maneuvers using the Finite elements Method. Kinematic curves of the wheel joint were determined and their influence on the steering kinematics was assessed. Additionally, the developed stress distributions along the leaf-spring's arms were determined. The results reveal the influence of each design parameter on the kinematic and stress behavior of leaf springs both qualitatively and quantitatively.

关键词： Finite element method

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