2023 Plenary Speakers
To be added soon...
Biography: Dr. Zengtao Chen joined the Department of Mechanical Engineering at University of Alberta as a Professor in August 2014. He has been a faculty member with the Department of Mechanical Engineering of University of New Brunswick for ten years prior to the current position with UofA. His research areas include Mechanics of Materials, Materials Modelling, and Damage and Fracture Mechanics. His recent work includes multiscale modelling of deformation and damage evolution in aluminum and steel alloys, advanced thermal stress analysis of smart materials and structures, nanostructures, and composite structures. He is a Fellow of ASME. Title: Transient, Nonlocal Heat Conduction and Its Effect on the Vibration of Singlewall Carbon Nanotubes Abstract: Carbon nanotubes exhibits superior thermomechanical properties, such as the extremely high thermal conductivity and strength, and have found many applications as heat conduits and thermomechanical coatings in advanced functional devices. Linear and nonlinear vibration of carbon nanotubes under transient heating or cooling plays an essential role in the integrity and reliability of the advanced devices. In the present talk, we employ the nonlocal, non-Fourier theory to explore the transient heat conduction in single-wall carbon nanotubes, and demonstrate the effect of intrinsic length-scale, thermal relaxation and geometry on heat conduction. Then the effect of transient, nonlocal heat conduction on the vibration of a single-wall carbon nanotube is discussed, focusing on the frequency response of carbon nanotubes.
Biography: Dr. Sergei Alexandrov is a Visiting Professor at Beihang University (Beijing, China) and a Research Professor at the Laboratory for Technological Processes of the Institute for Problems in Mechanics of the Russian Academy of Sciences. He received his Ph.D. in Physics and Mathematics in 1990 and D.Sc. in Physics and Mathematics in 1994. He worked as a Professor at Moscow Aviation Technology Technical University (Russia), a Visiting Scientist at ALCOA Technical Center (USA), GKSS Research Centre (Germany) and Seoul National University (South Korea), and was a Visiting Professor at Aveiro University (Portugal), University of Besancon (France) and Technical University of Malaysia (Malaysia). He is a member of the Russian National Committee on Theoretical and Applied Mechanics. Sergei Alexandrov has published more than 400 papers in journals, books and conference proceedings, including three monographs and around 230 papers in journals indexed in the Web of Science. He has participated in the scientific committee of several international conferences and served as a reviewer in a wide range of international journals. He is on the editorial board of several journals including Continuum Mechanics and Thermodynamics (Springer) and Structural Engineering and Mechanics (Technopress). His research areas are plasticity theory, fracture mechanics, and their applications to metal forming and structural mechanics. Title: Finite Plastic Bending Under Plane Strain Conditions Abstract: Finite plastic bending attracts researchers' attention due to its importance for identifying material properties and frequent occurrence in sheet metal forming processes. This presentation focuses on analytic and semi-analytic solutions for pure bending and bending under tension. Both elastic- and rigid- plastic models are considered, but the material is supposed to be incompressible. It is shown that elasticity can be ignored even if residual stress and strain fields are concerned. The solution is facilitated by using Lagrangian and cylindrical coordinate systems. The origin of the latter moves as the deformation proceeds. This unified approach allows for several isotropic material models, such as |
Biography: Prof. Takahiro Ohashi is one of the representative delegate of Japan Society for Technology of Plasticity from April 2016 to now. Also, he is the board of trustees of Aluminum Forging Association in Japan. Prof. Takahiro Ohashi experienced in directing a national research project for a new die structure of Ministry of Economy, Trading and Industry (METI), as well as experienced in directing 3 research teams of National Institute of Advanced Industrial Science and Technology (AIST). Title: Utilization of Fiber-reinforced Ice as a Soluble Core for Tube Forming Abstract: Methodologies to generate hollow products have recently been studied due to industries’ demands for lightweight parts. The presenter has studied the lateral extrusion of a pipe with a lost core of a low-temperature melting medium. This process tends to be considered as a kind of tube hydroforming processes (THF), however it is like rather a forging process that is called lateral extrusion or injection forging from the view to material deform mechanism than hydroforming and sheet metal forming. In tube forming, the sum of the circumference strain, the reduction ratio of wall thickness, and the meridian strain must be zero because of the volume constancy law. Therefore, bulging (i.e., the increment of the circumference strain) must be generated by reduction of wall thickness or development of meridian strain. In conventional THF without an axial load, bulging is generated by reducing wall thickness. However, in the lateral extrusion of a pipe with a lost core, it is generated mainly by development of meridian strain. . Product shape is fabricated under compression though it is done under tension in hydroforming. mechanism. As the lateral extrusion process is performed under compression, it can be used to obtain a more accurate product shape and has different forming limitations than hydroforming. The extrusion process can be used to fabricate a particular product shape which cannot be obtained by conventional hydroforming. Only a die-set and a single press are required for the extrusion process, and hence, the process is convenient for manufacturers who do not have dedicated facilities for hydroforming. Thus, the extrusion process is successfully utilized in small industries. However, utilization of lead and its alloys are strictly prohibited in industries because of environmental problems. Therefore, an effective alternative of fillings for lead or low temperature melting alloys is necessary for use in tube forming industries. The presenter have successfully utilized fiber-reinforced ice (FRI) as a filling for the bulging process of pipes. In the presentation, he introduces the detail of the process and fiber-reinforced ice, and how to prepare the ice composite rapidly. |
Prof. Zengtao Chen, ASME Fellow, University of Alberta, Canada
Prof. Sergei Alexandrov, Beihang University, China&Institute for Problems in Mechanics of the Russian Academy of Science, Russia
Prof. Takahiro Ohashi, Kokushikan University, Japan