外文翻译双螺杆挤出活性材料加工工艺.docxVIP

附录A Twin Screw Extrusion Processing of Energetic Materials ABSTRACT The continuous processing of various energetic formulations is a challenge that requires the apriority characterization of the rheological behavior of the energe- tic formulation, mathematical modeling of the process, a good understanding of the structure development aspects and ways of verifying and characterization of microstructural distributions of energetic grains. These steps facilitate the gener- ation of a detailed understanding of the flow and deformation behavior and the thermo-mechanical history that the energetic material will experience in the continuous processor. Such work, done prior to the actual continuous processing of the live materials, eliminates or minimizes the subsequent risk associated with the precarious trial and error procedures and experimental studies that are prevalent in other industries~ However, the determination of the physical, rheo- logical and processability characteristics of energetic formulations under various relevant sets of operating conditions of the extrusion process, the development, the fabrication and the installation of instrumentation for the characterization of specific material properties, the data analysis and the determination of material parameters, and the mathematical modeling of the thermo-mechanical history of the energetic formulations in the extruder and the die are not straightforward. The challenges include the slip at the wall of the viscoplastic suspensions, possi- ble segregation of the binder and the migration of the particles in the transverse to flow direction, the important role played by air, the formation of flow insta- bilities and associated surface and bulk distortions of extrudates, the formation of hot spots, the important role played by the distributive and dispersive mixing of the ingredients as affected by the deformation history and the specific energy input in the extruder. The quantitative characterizations of the