主题演讲人
Prof. Henry Hu

Prof. Henry Hu
Department of Mechanical, Automotive and Materials Engineering, University of Windsor, Canada

Speech Title: Heat Transfer in Pressurized Solidification of High Integrity Mg Alloy for Potential Lightweight Automotive Applications

Abstract:
AZ91 as one of the most popular magnesium alloys is widely used for non-structural engineering applications made by die casting (DC) processes in automobiles, hardware and consumer electronic industries. DC AZ91 components have moderate mechanical properties due to the presence of relatively high porosity content resulting from turbulent flow during rapid cavity filling. It has demonstrated that squeeze casting (SC) processes, also termed pressurized solidification, in which laminar filling flow of melt and high applied pressures are employed during solidification, are capable of eliminating porosity and enhancing the mechanical properties of Mg-based alloys for potential lightweight structural automotive applications. However, work on heat transfer phenomena occurring during pressurized solidification of AZ91 is limited. In this study, a step die was made by P20 steel for squeeze casting magnesium alloy AZ91 with five different section thicknesses of 2, 4, 8, 12, and 20 mm under an applied pressure of 60 MPa. K-type thermocouples were utilized to measure temperatures of the squeeze casting surfaces as well as three different depths, i.e., 2, 4, and 8 mm from the mold inner wall at each step. With the temperature measurements, interfacial heat transfer coefficients (IHTC) at the casting and mold inner surface and heat fluxes were determined by solving one-dimensional heat conduction formulae using the inverse method. The results of the calculated IHTCs showed that, upon the commencement of squeeze casting, the IHTC values for all the 5 steps rose very rapidly. Before decreasing, the IHTC at each step reached its own individual peaks. As the section step thickness changed from 2 mm (step 1) to 20 mm (step 5), the IHTC peak values increased significantly. It took comparatively longer time for a thicker step to reach its peak IHTC value, and also to descend its IHTC to a low and steady level.

Prof. Vivian Wing-Yan TAM

Prof. Vivian Wing-Yan TAM
School of Computing, Engineering and Mathematics, Western Sydney University, Australia

Speech Title: The New Era for Recycled Concrete: CO2 Concrete

Abstract:
Professor Vivian Tam and Associate Professor Khoa Le have pioneered sustainable construction research with the invention of CO2 Concrete. CO2 Concrete utilises waste and harmful greenhouse-gas emissions to create new material for structural applications. This is the world’s first recycled concrete research to raise the Australian industry's awareness of the: (i) severe impact of emissions on the environment; and (ii) potential of recycled concrete which has only been used for non-structural applications to date. Using this new techniques, CO2 Concrete has matched its strength of virgin concrete. CO2 Concrete also uses less cement which makes its more environment-friendly and cost effective with 11% cost reduction.
Using existing annual Australian concrete production, a potential net life-cycle benefit of $16 billion could be achieved using CO2 Concrete instead of the net deficit of $22 billion using virgin concrete and 2.68 billion kgs of CO2-e of life-cycle greenhouse-gas emissions could be reduced using CO2 Concrete. This gap will only grow bigger with the increasing growth rate of concrete production.
This innovation has founded a start-up company, Ecobond (http://www.ecobond.com.au) in January 2018. The technology has been adopted in the market on a commercial scale for biosecurity platforms in April 2018 at Western Sydney University, and 3m x 3m slabs in partner with Volumetric Concrete Australia in March 2019.

Prof. Wei Min Huang

Prof. Wei Min Huang
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore

Speech Title: Advanced shape memory technology to reshape product design, manufacturing and repairing/recycling: an update of recent development

Abstract:
New shape memory materials and phenomena are continuously reported in recent years. The interesting feature of the shape memory effect (SME), which has been found in alloys, polymers, ceramics and hydrogels, is behind all shape memory phenomena, and is different from the shape change effect (SCE) in most of the applications based on traditional materials.
The SME provides us with many new techniques for advanced applications, in which conventional approaches may have difficulties to cope with.
In this talk, a brief review of the various shape memory phenomena in SMMs is presented. The fundamentals behind them are discussed. The important features of the advanced shape memory technology are explained. Typical applications in the whole life cycle of products, from design, fabrication to repairing/recycling, are revealed to demonstrate the potential advantages of this technology.

Prof. Ping Lu

Prof. Ping Lu
School of Optical and Electronic Information, National Engineering Laboratory for Next Generation Internet Access System, Huazhong University of Science and Technology, China

Speech Title: Special optical fiber microstructure devices for sensing applications

Abstract:
Special optical fiber microstructure devices for sensing applications with high precision is very important in the applications, especially for biochemical detection, structural health monitoring, pipeline leakage detection, antisubmarine monitoring, nondestructive testing and seismic wave monitoring.
I mainly focus on these following special microstructure sensor,such as Asymmetrical thin-core long period grating (ATC-LPG),Asymmetrical thin-core ultralong period grating (ATC-ULPG),
Single hole twin eccentric core fiber (SHTECF) . These microstructure sensors show high sensitivity and some other special advantages.

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IWMSME2020
2020第三届材料科学与机械工程国际学术研讨会

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