| 研究開始時の研究の概要 |
This research aims to investigate polymer particles behavior, especially Ultra-High Molecular Weight Polyethylene (UHMWPE), subjected to high velocity impact at the scale of the nano-microstructure. The challenge of the project lies in the difficulties to obtain reliable material characterization at the scale of the powder. This is even more true at large strain rate due to the event kinetic. This research will allow a deeper understanding of the nano-micromechanics of UHMWPE under highvelocity impact, as well as the formation mechanism of polymer coating by cold spray.
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| 研究実績の概要 |
Despite the progress of the last decade regarding polymer coating by cold spray process, the process is still governed by "try and fail" experiments. In this research, we focused on the microstructural evolution of the material, from powder to coating. Using PFA powder, which shows remarkable results when being cold spray, we developed a theory, which if reliable, could allow to spray any polymeric powder. This one is based on 4 pillars: 1) roughness of the substrate 2) addition of nano-alumina, 3) feedstock powder in a glassy state, 4) sprayed powder at the melting temperature. These assumptions led us to design a new cold spray experiment for polymeric powder whose glass transition temperature is well below the room temperature using computational fluid dynamics simulations.
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