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Prof. Shigeru Horii

Faculty of Engineering, Kyoto University of Advanced Science, Japan

Speech Title: Linear-drive type modulated rotating magnetic field for triaxial grain orientation

Abstract: Epitaxial growth technique is the typical and practical for production of single crystals which have triaxial aligned and densified microstructure. Recently, a modulated rotating magnetic field (MRF) has been reported as the magnetic field in which the triaxial aligned microstructure can be formed for grains with triaxial magnetic anisotropy. In principle, this MRF technique is a room-temperature process and is useful for fabrication of not only triaxially aligned polycrystals but also composites containing triaxially aligned fillers. However, the most serious issue on the MRF technique is that a sample-rotation system is required to generate MRF when the 10-tesla-class superconducting electromagnets are used. That is, it is a batch process and quite inefficient from the viewpoint of the production process. Recently, our group has newly developed Linear Drive-type MRF (LDT-MRF) apparatus [1] as MRF applicable to the continuous production process for sheet-shaped products in 2018. In this presentation, the principle of the apparatus and recent progress in triaxial magnetic alignment by LDT-MRF are explained.
[1] S. Horii et al., J. Cer. Soc. Jpn. 126 (2018) 885.

Biography:Shigeru Horii is currently a Professor in the Faculty of Engineering at the Kyoto University of Advanced Science (KUAS), Kyoto, Japan. He obtained Dr. Eng. from the Nagoya University, Nagoya, Japan, in 1999. He worked at the University of Tokyo, Tokyo, as a post-doctoral fellow of JSPS from 1999 until 2000. He joined the University of Tokyo as an Assistant Professor from 2000 until 2009 in the Department of Applied Chemistry, and the Kochi University of Technology, Kochi, as an Associate Professor from 2009 until 2013. He worked at the Kyoto University, Kyoto, as an Associate Professor from 2013 until 2019. He joined KUAS in 2019 and is focusing on triaxial magnetic alignment in layered functional materials as a research topic.

Prof. Armando Ramalho

Polytechnic Institute of Castelo Branco, Portugal

Speech Title: Structural integrity evaluation of anisotropic components manufactured by 3D printing

Abstract: The fused filament fabrication process used on low-cost 3D printers has allowed the growth of this manufacturing method in the most diverse technological fields. The use of more strength, rigid, and tough thermoplastics such as polylactic acid (PLA), acrylonitrile butadiene styrene (ABS), polyethene terephthalate glycol (PETG), or polyamides, including their reinforcement with short fibres, allowed the expansion of this technique in areas with demanding structural requirements, in which should be assured a reliable design. Predicting the mechanical integrity of components manufactured by additive processes is a challenging task that is difficulted by the complexity of the geometries fabricated by these processes, along with the anisotropy enhanced by the layer-by-layer manufacturing method and the difficulty in quickly obtaining the elastic and strength properties of the materials, which are strongly influenced by the manufacturing parameters. The use of 3D CAD models in the design phase of components manufactured by 3D printing facilitates the use of the finite element method in assessing their integrity and simulating their in-service behavior. However, in the literature there are few examples of application of the finite element method in the analysis of 3D anisotropic printed parts, and the existing ones are restricted to simple geometries. To deal with the anisotropy of materials and the presence of several phases, intense research has been carried out for the last decades in the field of evaluating the mechanical strength of composite materials, introducing several specific failure criteria. In this speech, the simulation of in-service behavior of components manufactured by 3D printing is presented, applying criteria usually used in the study of composite materials, to evaluate their structural integrity.

Biography: Armando Ramalho holds a PhD degree in Mechanical Engineering completed at the University of Coimbra, Portugal, as well as a MSc in Mechanical Engineering from the Higher Technical Institute of the University of Lisbon. He currently works at the Polytechnic Institute of Castelo Branco, Portugal. He was a Professor at the Polytechnic Institute of Guarda and at the University of Coimbra. He was the Director of the School of Technology of the Polytechnic Institute of Castelo Branco for over twelve years. His current research efforts focus on fatigue of welded structures, design of parts obtained by additive manufacturing, Mechanical Properties of Materials, as well as in simulation of mechanical and biomechanical systems using numerical models developed on finite element software. Some of his most significant publications can be found in https://www.cienciavitae.pt//en/1D19-1C61-FA56

Prof. Osman Adiguzel

Department of Physics, Firat University, Turkey

Speech Title: Thermomechanical Transformations Governing Thermoelasticity and Superelasticity in Shape Memory Alloys

Abstract: A series of alloy systems, called shape memory alloys exhibit a peculiar property, called shape memory effect, by giving stimulus response to changes in the external conditions. This phenomenon is initiated with thermomechanical processes on cooling and deformation and performed thermally on heating and cooling, with which shape of the materials cycle between original and deformed shapes in reversible way. Therefore, this behavior can be called Thermoelasticity. Deformation in low temperature condition is plastic deformation, with which strain energy is stored in the materials and releases on heating by recovering the original shape. This phenomenon is governed by the thermomechanical transformations, thermal and stress induced martensitic transformations. Thermal induced martensitic transformations occur on cooling with cooperative movement of atoms in <110 > -type directions on {110} - type plane of austenite matrix, along with lattice twinning and ordered parent phase structures turn into the twinned martensite structures. The twinned structures turn into detwinned martensite structures by means of stress induced martensitic transformations with deformation. These alloys exhibit another characteristic, called superelasticity with the recoverability of two shapes at different conditions. Superelasticity is performed in only mechanical manner with stressing and releasing the material in elasticity limit at a constant temperature in the parent austenite phase region, and shape recovery occurs instantly and simultaneously upon releasing, by exhibiting elastic material behavior. Superelasticity is performed in non-linear way, unlike normal elastic materials behavior, stressing and releasing paths are different, and cycling loop refers to the energy dissipation. Superelasticity is also result of stress induced martensitic transformation, with which the ordered parent phase structures turn into the detwinned martensite structures by stressing.
These alloys are functional materials with these properties and used as shape memory elements in many interdisciplinary fields, from biomedical application to the building industry. Copper based alloys exhibit this property in metastable β-phase region, which has bcc-based structures. Lattice invariant shears and twinning are not uniform in these alloys, and the ordered parent phase structures undergo the non-conventional layered structures with martensitic transformation. These layered structures can be described by different unit cells as 3R, 9R or 18R depending on the stacking sequences.
In the present contribution, x-ray diffraction and transmission electron microscopy studies were carried out on copper based CuZnAl and CuAlMn alloys. X-ray diffraction profiles and electron diffraction patterns exhibit super lattice reflections inherited from parent phase due to the displacive character of the transformation. Critical transformation temperatures of these alloys are over the room temperature, and alloy samples were aged at room temperature in martensitic condition, and a series of x-ray diffractograms were taken during ageing. X-ray diffractograms taken in a long-time interval show that diffraction angles and intensities of diffraction peaks change with the aging time at room temperature. This result refers to a new transformation in diffusive manner.

Biography:Dr. Osman Adiguzel graduated from Department of Physics, Ankara University, Turkey in 1974 and received PhD- degree from Dicle University, Diyarbakir-Turkey. He studied at Surrey University, Guildford, UK, as a post doctoral research scientist in 1986-1987, and his studies focused on shape memory alloys. He worked as research assistant, 1975-80, at Dicle University and shifted to Firat University in 1980. He became professor in 1996, and he has been retired due to the age limit of 67, following academic life of 45 years. He published over 80 papers in international and national journals; He joined over 120 conferences and symposia in international and national level as Plenary Speaker, Keynote Speaker, Invited speaker, speaker or Poster presenter. He served the program chair or conference chair/co-chair in some of these activities. In particular, he joined in last six years (2014 - 2019) over 60 conferences as Speaker, Keynote Speaker and Conference Co-Chair organized by different companies in different countries.
Additionally, he retired at the end of November 2019, and contributed with Keynote/Plenary Speeches over 120 Virtual/Webinar Conferences, due to the coronavirus outbreak in three year of his retirement, 2020 and 2022. Dr. Adiguzel served his directorate of Graduate School of Natural and Applied Sciences, Firat University in 1999-2004. He supervised 5 PhD- theses and 3 M. Sc theses. He is also technical committee member of many conferences. He received a certificate which is being awarded to him and his experimental group in recognition of significant contribution of 2 patterns to the Powder Diffraction File – Release 2000. The ICDD (International Centre for Diffraction Data) also appreciates cooperation of his group and interest in Powder Diffraction File.
Scientific fields of Dr. Adiguzel: Shape memory effect and displacive phase transformations in shape memory alloys and other alloys, molecular dynamics simulations, alloy modeling, electron microscopy, electron diffraction, x-ray diffraction and crystallography.

Prof. Ivana Salopek Čubrić

University of Zagreb Faculty of Textile Technology, Croatia

Speech Title: Investigation of the Abrasion Resistance of Polymer Yarns

Abstract: Material abrasion is a critical consideration in product design, manufacturing, and maintenance because it has a high impact on several properties. When it comes to the abrasion of polymer yarns, insight into the behaviour of yarns due to constant abrasion is important for ensuring final product quality, performance, and customer satisfaction. For this study, a group of polymer yarns is selected. The yarns differ in raw material, as well as the yarn type. Within the experiment selected yarns in both single condition and within the fabric structure were conducted to different abrasion tests. The study findings reveal that yarn type, raw material composition, and additional treatments significantly influence abrasion resistance. Recycled polyester yarns demonstrate comparable, if not superior, abrasion resistance to conventional ones, making them viable for various applications.

Biography: Ivana Salopek Čubrić completed two studies at the University of Zagreb and received PhD in technical sciences at the same university. Since the year 2002, she has been employed at the University of Zagreb Faculty of Textile Technology recently in the status of a full professor. She led and was a collaborator on several EU-funded projects and is a lead of a project funded by the Croatian Science Foundation. She is a reporter and reviewer of international competitive projects for different EU agencies. She has published over 250 papers in journals, books and conference proceedings and was the editor of 6 proceedings of international scientific conferences. She is a frequent guest lecturer at a number of European institutions with long research stays at Loughborough University (UK) and the University of Maribor (Slovenia). She served as president and vice president of the Croatian Ergonomics Society, is a member of the editorial board of 8 scientific journals, and participated as an active member of the organizational and program committees of 18 conferences. As part of her teaching activities, she participated in the teaching of 15 courses at all levels of studies. She mentored 50 final and graduate theses. She received several awards for scientific and teaching work. At her home institution, she was the head of the Study for obtaining the requirements for admission to graduate studies, the head of the Extraordinary Graduate Studies, the president of the Committee for Public Relations and the head of the Department for Textile Design and Management (for two terms). Additionally, she is active as the president of TO 159 at the State Institute for Standards in the field of ergonomics.