Metallic powder-based additive manufacturing (AM) technologies show promising potentials to reshape manufacturing industries. However, the wide adoption is hindered by the lack of understanding of physical mechanisms and uncertainties due to numerous influential factors. To this end, we have developed a variety of multi-scale multi-physics models, including: physically-informed heat source models, specifically, for an electron beam from micro-scale simulations of electron-atom interactions, and for a laser incorporating multi-reflection and Fresnel absorption; high-fidelity powder-scale Discrete Element Method-Computational Fluid Dynamics (DEM-CFD) models to simulate powder being spread and then melted; and an efficient Finite Element (FE) model to simulate thermal stress and distortion at part-scale. We also realized the seamless linking of Process-Structure-Property models to predict mechanical properties from process parameters. These models have proven to be useful in revealing the physical mechanisms, which have been validated against experiments.
Dr. Wentao Yan has been an assistant professor at the Department of Mechanical Engineering, National University of Singapore (NUS) since 2018. Prior to this, he was a postdoctoral fellow at Northwestern University and also a guest researcher at the National Institute of Standards and Technology (NIST), in the USA. He finished his phd work jointly between Tsinghua University and Northwestern University, after obtaining his bachelor’s degree in Tsinghua University. His research is focused on employing computational modeling to understand the mechanics and physics in advanced manufacturing and to improve the manufacturing quality in a “smart” way instead of trial-and-error experimentation.
Zoom Link: https://umass-amherst.zoom.us/j/93324973114