Session 1: In situ transmission electron microscopy investigation on the mechanical properties of ceramic nanowires
Dr. Qiong Liu (QUT)
Abstract: Ceramic semiconducting nanowires (NWs) have been widely applied to the NW-based devices and NW-strengthened composites. Determining the mechanical performance of NWs and understanding their deformation behaviors are crucial for designing and manufacturing NW-based devices and composites. This talk will provide an overview of our works, where we use in situ transmission electron microscopy (TEM) method to reveal the underlying bending mechanisms of ceramic NWs. The results can offer implications of the mechanical deformations for ceramic semiconductors.
Presenter: Dr. Qiong Liu started his PhD in 2017 under the supervision of Prof. Yuantong Gu at QUT and graduated in 2020. He is currently a postdoctoral researcher in our group. His current and PhD’s projects are to investigate the mechanical properties of ceramic semiconducting nanowires. In the past four year, he has published 5 papers in high-quality international peer-reviewed journals and has another one under review.
Session 2: An introduction of Discrete Element Method (DEM)
Mr. Mingrui Dong (USYD)
Abstract: Granular materials play an essential role in our daily lives, from the sand castle on the beach and medicine powder to nuclear thermal beds. DEM is one of the computational methods which can provide rich information about the behaviour of materials constituted by individual particles or coarse-grained particle clusters. Therefore, observing the particle scale movement due to the inter-particle contact (normal, tangential, rolling and cohesion) is possible from a particle level. From a macro perspective, one can examine the overall stress state of the sample. This presentation will start with introducing fundamental governing equations in DEM. Then, looking into several applications of DEM in terms of packing and granular flow. Finally, the presenter would like to discuss the current challenges of DEM when solving specific problems and share some personal experiences using DEM.
Presenter: Mingrui DONG is currently a third-year PhD candidate at the University of Sydney (USYD). His supervisor is Assoc. Prof. Yixiang GAN. He obtained a master’s degree at USYD and a bachelor’s degree from the China University of Geosciences (Beijing). His research interests centre around the granular packing formation and the effect of packing structure on transportation phenomena. His current research is on the cohesive granular packing and liquid transfer within pores.