Biography: Professor Ir Dr Mohd Hamdi bin Abd Shukor received his B.Eng. (Mechanical), with Honours from Imperial College London and his M.Sc. In Advanced Manufacturing Technology & System Management from University of Manchester Institute of Science & Technology (UMIST). His Doctoral study was in the field of thin film coating for biomedical applications for which he was conferred Dr. Eng by Kyoto University. He is a Fellow of the Institution of Mechanical Engineering, UK, and a professional engineer registered with the Board of Engineers Malaysia. Prof Hamdi has devoted his career in nurturing research and innovation and has mentored over 70 PhD students, particularly in the field of machining, materials processing and biomaterials. He has authored more than 160 ISI journals and h-index of 26. He is also a director and founder of the Centre of Advanced Manufacturing & Materials Processing (AMMP Centre), in which has grown from modest-size team of researchers and engineers to an interdisciplinary research hub. Prof Hamdi has obtained recognition from various international and local organizations.
Title of Speech: Development of Hydroxyapatite-Bioglass composite bioceramics scaffold for implant application
Abstract: In a current research project extremely low pressure Spark plasma sintering (SPS) has been employed to develop mechanically stable composite scaffold materials with considerable porosity in Hydroxyapatite and Bioglass® system, with the aim to avoid excessive reactions between the constituents and crystallization of Bioglass®. The ability to avoid excessive reactions between the constituents and crystallization is very critical, as crystallized Bioglass® does not exhibit the characteristic of high biocompatibility and the reaction between the constituents yield undesired new products. SPS is a non-conventional sintering technique which can consolidate samples at lower pressures and temperatures in a shorter time period, compared to the conventional powder processing routes. These less severe processing parameters provide an opportunity to control the mechanical stability, crystallization tendency and grain size of the bioceramics and their composites. The optimized processing parameters during SPS could achieve the above-mentioned targets which is a novel development. Physico-mechanical characterization, in vitro bioactivity analyses and in vitro biocompatibility analyses have been carried out to analyze the impact of the processing conditions on the final characteristics of the scaffold materials. This novel development has yielded promising bioactivity and biocompatibility results suggesting that SPS has a great potential to improve the biological performance of Hydroxyapatite-Bioglass composite bioceramics.
Biography: Yong Suk Yang is a Professor Emeritus in the Nanoenergy Engineering Department and former Dean of the College of Nanoscience & Nanotechnology, and former Director of the Research Center for Dielectric and Advanced Matter Physics at Pusan National University. He received his BS in physics in 1977 from Sogang University, Seoul, and PhD in solid state physics in 1990 from McGill University, Montreal. He is a faculty member since 1993. He has been carrying out experiments at neutron- and synchrotron radiation- related international facilities, NSLS, APS, SSRL, Oak Ridge (USA), AECL (Canada), SPring8 (Japan), Riso (Denmark), KAERI (Korea). He has published various articles on the phase transitions of structural order-disorder, spin dynamics on low dimensional magnet, glass-crystallization through nucleation and growth, negative thermal expansion. Multiferroics, dielectric relaxation, solid oxide fuel cell, lithium ion battery are also his recent interests. Not only research but he also emphases the importance of education and training. He has taught under and graduate students over 30 different subjects, quantum mechanics, statistics, solid state physics, thin films, electronic properties of materials, thermoelectric, semiconductor, thermal physics, ceramics, dielectrics, modern physics…, during the last 20 years.
Title of Speech: Nano-crystallization mechanism of BaO-Na2O-Nb2O5-SiO2-B2O3 glass; critical size, growth rate and strain effect
Abstract: Crystallization of a glass is one of the ways to produce various types of composite materials such as secondary glass, mixture of glass-ceramics/metals, ceramics/metals and nano crystals, which can reveal different physical properties. In the scientific point of view, understanding the crystallization process from a glass is important and useful because it enables us to control the composite production specifications of crystal size, crystallinity, crystal structure, and crystal volume fraction in the glass. In this work, BaO-Na2O–Nb2O5–SiO2–B2O3 glass was synthesized by rapidly quenching the melt. Measurements of thermal, structural, local vibrational and surface properties have been analyzed by applying the models of Williamson-Hall plot, Johnson-Mehl-Avrami-Kolmogorov function and isoconversion method, to investigate the crystallization kinetics.
Biography: Professor Chen is a Professor of Mechanical Engineering Department at the National Cheng Kung University, Taiwan. After receiving his Ph.D. from University of Florida, Prof. Chen joined the Department of Mechanical Engineering, National Cheng Kung University in 1986. He is the Editor of “Selected Papers on Photoelasticity”, SPIE Milestone Series, 1999. He was an Adjunct Professor in Department of Material Sciences and Mechanics, Michigan State University in 2000. Since 2004, he served as the Chairman of Photoelasticity Division of Society for Experimental Mechanics for 10 years, and received Zandman Award in 2009. He was the Vice Chairman of Mechanical Engineering Department in 2005, and the Director of Research and Education Division in 2010, and Distinguished Research Fellow in 2012, Center for Micro/Nano Science and Technology, National Cheng Kung University. He has published more than 100 papers, guest edited a special issue of Journal of Strain, contributed chapter in more than 10 books, and gave invited or keynote talks in various international conferences. His current research is focused on materials/structures measurement and testing, digital photomechanics, optical inspection and nondestructive testing for various applications.
Title of Speech: Application of Digital Image Correlation to Test Composite Materials
Abstract: Digital Image Correlation (DIC) is a noncontact full-field optical method for measuring displacements in experimental testing, based on the correlation of object images taken before and after deformed. It has been used in several fields of experimental mechanics. Recently, the application of DIC to the characterization of composite materials is widely expanded. Dental composites are light-curable resin-based materials with an inherent defect of polymerization shrinkage which may cause tooth deflection and debonding of restorations. The shrinkage behaviors of dental composites under four different light curing regimens were investigated by using digital image correlation (DIC) method. The shrinkage in unbonded and bonded restorations are compared. The effect of curing direction and light intensity on the shrinkage were compared. The results may provide useful information for clinical usage, and further stress analysis by numerical methods. Bonding process is frequently used in the composite structure. However, the occasional occurrence of weaker bonds in the adhesive bonded composites may cause catastrophic failure of the composite structure. Therefore an infrared image correlation method was developed to assess the strength of bonded composites by tensile testing. Using step heating thermography, the IR images of composites are obtained under various loads. Utilizing the natural feature of IR image of bonded composites, the deformation at the bonding area were determined by (DIC). Test specimens with artificial defects of Teflon and various combination of hardener/adhesive were made. With proper filtering process, sub image size, and IR image, the deformation at the bonding areas determined experimentally were compared to the results obtained using ordinary light DIC. Test results will be shown and discussed.