Three Argonne researchers will discuss their Laboratory-Directed Research and Development (LDRD) sponsored work at the LDRD Seminar Series presentation Tuesday, Nov. 13, 2018, at 12:30 p.m. in Building 212, Room A157. All are welcome to attend.
Visit the LDRD website to view upcoming seminars.
Robert Erck
“Rheological Properties of Some Lubricating Fluids,” by Metallurgist Robert Erck (AMD)
Abstract
Rheology is the study of flow in fluids. The LDRD was used to obtain a machine which measures the traction forces of fluids which are compressed between a rotating ball and disk. The types of fluids that were tested are those kinds that are typically used in engineering systems like engines and drivetrains. The fluids were bio-based, olefin, mineral, polyol, polyalkylene glycol and diester. Values of the traction force correlated with regime and type of fluid and temperature. It is described how these results can be used to increase efficiency in mechanical systems.
Biography
Robert Erck is a metallurgist in the Applied Materials division. His principle work involves the science of tribology (friction and wear). Emphasis is placed on oil additives, test machine design and data gathering. Prior projects involved electron-beam thin film deposition, flywheel energy storage, ferroelectrics and superconductors.
Jeffrey Larson
“Coordinated Vehicle Platooning with Multiple Speeds,” by Assistant Computational Mathematician Jeffrey Larson (MCS)
Abstract
Vehicles in a platoon — following each other with small intervehicle distances — experience reduced aerodynamic drag and use less fuel. In this talk, we consider a model for optimally routing vehicles through a network to minimize their collective fuel use.
Biography
Jeffrey Larson is an assistant computational mathematician and he studies numerical optimization methods for optimizing functions that are expensive to evaluate.
“Ultrahigh-Speed X-ray View of Metal Laser Spattering,” by Postdoctoral Appointee Cang Zhao (XSD)
Cang Zhao
Abstract
We integrated and combined the state-of-the-art in situ and in-real-time synchrotron-X-ray-based full-field imaging technique and the laser processing system at the Advanced Photon Source (APS). In this talk, we will show our most recent progress in understanding the laser spattering behavior of Ti-6Al-4V. With the micrometer spatial and sub-nanosecond temporal resolutions, our study has unraveled an instantaneous-bulk-explosion induced mechanism. The discovery opens a door to manufacturing spatter- and defect-free metal parts via precise control of the keyhole dynamics.
Biography
Cang Zhao is a postdoc in the X-ray Imaging Group at the APS. He works, together with Tao Sun and Niranjan Parab, on the LDRD project of Real-time Monitoring of Material Structure Evolution in Additive Manufacturing Processes. He joined the group in early 2016 after completing his Ph.D. in structural engineering at UCSD. Recently he received the Postdoctoral Performance Award in Applied Science from the lab.