2018 3rd International Conference on Design, Materials and Manufacturing
ICDMM 2018              August 11-13, 2018
University of the Ryukyus, Okinawa, Japan

Keynote Speakers

Prof. Jesus Toribio, University of Salamanca, Spain

Professor Jesus Toribio graduated in Civil Engineering in 1982 and then in Mathematics in 1986. In 1987 he was awarded his PhD in the Polytechnic University of Madrid (UPM) and turned into Associate Professor in that Institution. In 1992 he became Full Professor and Head of the Materials Science Department of the University of La Coruña (at the age of 32, thus being the youngest Full Professor in the area of Materials Science in Spain). In 2000 he moved to the University of Salamanca (USAL) where is currently Full Professor of Materials Science and Head of the Fracture and Structural Integrity Research group (FSIRG) of that Institution.
His research work is mainly concerned with fatigue and fracture mechanics, environmentally assisted cracking, stress corrosion cracking and hydrogen embrittlement/degradation/damage of metals and alloys (mainly cold drawn pearlitic steel wires for civil engineering and austenitic stainless steels for nuclear engineering and energy applications), covering theoretical, computational and experimental aspects. He actively participates in International Conferences, very often being member of the International Advisory Committee, organising Special Sessions/Symposia, being Session Chairman or delivering Plenary/Keynote/Invited Lectures. Professor Dr. Jesus Toribio has published more than 500 scientific papers, most of them in international books and journals.
He is the Chairman of the Technical Committee 10 (TC10): Environmentally Assisted Cracking of the European Structural Integrity Society (ESIS) and has been Director (2013-2017) of the International Congress of Fracture-The World Academy of Structural Integrity (ICF-WASI), being responsible of launching the Ibero-American Academy of Structural Integrity (IA2SI). Prof. Toribio has been awarded a variety of scientific research prizes and awards including: (i) UPM Young Scientist Award of the Polytechnic University of Madrid; (ii) METROTEC Award for the best Technological Research Project; (iii) Honour Medal of the Spanish Group of Fracture (GEF/SEIE) in recognition of his research achievements in the field of fracture mechanics; (iv) Fellow of the Wessex Institute of Technology (WIT) in recognition of leadership and outstanding work in engineering sciences, (v) Top Reviewer 2011 in recognition of an outstanding contribution to the quality of the Elsevier International Journal Engineering Fracture Mechanics, (vi) Fellow of the European Structural Society (ESIS Fellow) for his outstanding contributions to the art, science, teaching or practice of fracture mechanics and his service to the society; (vii) Honorary Member of the Italian Group of Fracture (IGF) in acknowledgement and appreciation of his outstanding achievements in the research field of fracture mechanics (viii) Best Paper and Presentation Award in the International Conference on Energy Materials and Applications (ICEMA 2017) held in 2017 in Hiroshima, Japan, with a paper entitled: Numerical Simulation of Hydrogen Diffusion in the Pressure Vessel Wall of a WWER-440 Reactor.

Speech title: Fatigue & Fracture Crack Paths Generated by Manufacturing-Induced Microstructural & Strength Anisotropy in Cold Drawn Pearlitic Steels: A Tribute to Fray Luis de León in the 800th Anniversary of the University of Salamanca

Abstract: This paper studies fatigue & fracture crack paths generated by manufacturing-induced microstructural & strength anisotropy in heavily cold drawn pearlitic steel wires that are made by progressive (multi-step) cold drawing of a previously hot rolled pearlitic steel bar to produce commercial high-strength prestressing steel wires to be used in prestressed concrete structures. The paper deals with anisotropic fatigue & fracture behavior of progressively cold drawn pearlitic steels on the basis of their microstructural evolution during manufacturing by multi-step cold drawing that produces slenderizing and orientation of the pearlitic colonies, together with densification and orientation of the Fe/Fe3C lamellae, reviewing previous research by the author and co-workers on fracture behavior in inert and aggressive environments in the presence of crack and notches, with focus on hydrogen embrittlement as an important particular phenomenon (including many names such as hydrogen assisted cracking, hydrogen assisted fracture or hydrogen degradation). Results demonstrate the key role of manufacturing-induced microstructural anisotropy (orientation of the two microstructural levels of pearlitic colonies and ferrite/cementite lamellae as a consequence of the progressive/repetitive cold drawing) in the fatigue & fracture crack paths, thereby producing crack path deflection/deviation/branching with mixed-mode propagation, with the associated anisotropy of fatigue & fracture resistance and its linked anisotropic fatigue & fracture behavior (it means strength anisotropy with regard to fatigue, fracture, environmentally assisted cracking and hydrogen embrittlement), allowing the definition of a directional toughness depending on the specific crack path with its defined crack propagation direction/angle.

Prof. Ömer Aydan, University of the Ryukyus, Japan

Born in 1955, Professor Aydan studied Mining Engineering at the Technical University of Istanbul, Turkey (B.Sc., 1979), Rock Mechanics and Excavation Engineering at the University of Newcastle upon Tyne, UK (M.Sc., 1982), and finally received his Ph.D. in Geotechnical Engineering from Nagoya University, Japan in 1989. Prof. Aydan worked at Nagoya University as a research associate (1987-1991), and then at the department of Marine Civil Engineering at Tokai University, first as Assistant Professor (1991-1993), then as Associate Professor (1993-2001), and finally as Professor (2001-2010). He then became Professor of the Institute of Ocean Research and Development at Tokai University, and is currently Professor at the University of Ryukyus, Department of Civil Engineering & Architecture, Nishihara, Okinawa, Japan. He has furthermore played an active role on numerous ISRM, JSCE, JGS, SRI and Rock Mech. National Group of Japan committees, and has organized several national and international symposia and conferences. Professor Aydan has received the 1998 Matsumae Scientific Contribution Award, the 2007 Erguvanh Engineering Geology Best Paper Award, the 2011 Excellent Contributions Award from the International Association for Computer Methods in Geomechanics and Advances, the 2011 Best Paper Award from the Indian Society for Rock Mechanics and Tunnelling Technology and was awarded the 2013 Best Paper Award at the 13th Japan Symposium on Rock Mechanics and 6th Japan-Korea Joint Symposium on Rock Engineering. He was also made Honorary Professor in Earth Science by Pamukkale University in 2008 and received the 2005 Technology Award, the 2012 Frontier Award and the 2015 Best Paper Award from the Japan National Group of Rock Mechanics.

Speech title: Some Thoughts on Risk of Natural Disasters in Ryukyu Archipelago

Abstract: Ryukyu Archipelago is situated on Ryukyu Arc and consists of a 6 major islands together with 55 islands of various sizes. Compared to the other parts of Japan, the documented seismic history of Ryukyu Archipelago is not well known. However, there are huge tsunami boulders, which definitely imply mega earthquakes in the vicinity of Ryukyu Archipelago. Furthermore, The archipelago experiences great typhoons every year compared with other parts of Japan. The Ryukyu limestone formation overlaying Shimajiri formation consisting of mudstone, sandstone and tuff cover a huge area in many islands of the archipelago. While large scale sinkholes and cliff failures observed in association with Ryukyu limestone formation, large scale landslides are commonly observed in Shimajiri formation as geotechnical disasters. It is shown that the risk of mega earthquakes, mega-tsunamis, large-scale geotechnical disasters are quite high in addition to super-typhoons in Ryukyu Archipelago.

Plenary Speaker

Prof. Nao-aki Noda, Kyushu Institute of Technology, Japan

Prof. Nao-aki Noda is a professor at Department of Mechanical and Control Engineering, Kyushu Institute of Technology, Japan. He is also a staff of JSMS Kyushu Branch, Japan.
Prof. Noda received his Master and Doctor Degree from Kyushu Institute of Technology and Kyushu University respectively in 1981 and 1984. He is a Guest Professor of several universities, including East China Jiaotong University, Shandong University and Henan University of Science and Technology.
Prof. Noda's research focuses on Machine material/material mechanics, including Stress Analysis, Mechanics of Solids, Elasticity, Fracture Mechanics, Strength of Material, Body Force Method, Finite Element Method, Nemerical Analysis. He has published numerous papers and books, and got the Award for the Best Presentation in Asian Conference on Engineering Education in 2014, JSMS Award for Academic Contribution, The Japan Society of Meterial Science in 2010, Sokeizai Industry Technology Award, The Materials Process Technology Center in 2010. He was a Fellow of the Japan Society of Mechanical Engineers in 2012 and 2015. Prof. Noda also actively participated in many conferences and symposia.

Speech title: Anti-Loosening Performance and Fatigue Life Improvement for Bolt-Nut Connections Having Slight Pitch Difference

Abstract: In wide industrial fields, the bolt-nut joint is widely used as an important machine element to connect mechanical and structural components. To ensure the safety of structures, anti-loosening performance and enough fatigue strength are always required for bolt-nut connections with low cost. A lot of previous studies deal with the anti-loosening performance by developing newly bolt-nut connections and several studies contribute toward improving fatigue strength. This paper focuses on the pitch differences between the bolt and nut to realize both anti-loosing and high strength. In this study, therefore, several pitch differences are considered in experiment and analysis. A three-dimensional FEM simulation is applied to the nut tightening process to obtain the relationship between the torque and the bolt axial force. To obtain the anti-loosening performance without losing tightening force, the most desirable pitch difference is discussed. It is found that the tightening force can be predicted by FEM simulation since both results are in good agreement. From crack initiation and propagation process observed at bolt threads, fatigue life improvement mechanism is studied with the aid of the finite element analysis. To improve the fatigue strength efficiently, a lager root radius at the bolt-nut threads is introduced. Then, the combined effects on the slight pitch difference and the larger root radius are considered experimentally and analytically. The results show that the fatigue life of the bolt joints is significantly improved by introducing the suitable pitch difference and enlarging the root radius.

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