2011 Postdoctoral Fellow
Where are they now?
Dr. Yamamoto is an Assistant Professor of Aerospace Engineering at Penn State University.
Material Engineering in Nano/Micro Levels for Space Structures.
Final Report (1.4 MB pdf)
"The goal of my research is to gain the freedom to tailor material properties for any desired space application, taking advantage of a palette of nano/micro-scale features through controlled and ordered implementation. Currently, the selection of materials compatible with the space environment (vacuum, high and low temperature, and cosmic rays) is limited, resulting in high mass, high cost, and poor productivity. In the Keck Institute Study on Large Space Structures, new bi-material arrays are proposed for segmented mirrors as an alternative to monolithic single-component mirrors. Here, engineering in micro-scale is critical since it benefits optimization in various aspects, from optical, mechanical and thermal properties to affordability and productivity. However, these designed arrays have not been delivered yet due to the difficulty in achieving structural stability. I set the short-term goal to achieve thin (~1-100m), free-standing bi-material space mirrors that are thermomechanically stable in the space operation environment. A unique support that edge-clamps the array under a tensile stress is proposed to achieve high flexural rigidity regardless of the small thickness. Mechanical and thermal properties will be experimentally characterized using Stoney's equation, and thermal and mechanical failures will be theoretically evaluated using von Karman non-linear plate theory."