Abstract
This paper describes the numerical simulation of the orbital debris impacts on machined ultra precision surface under space environmental condition. The simulation deals with the degradation process of copper mirror surface by the impact of a diamond debris, where the impact speed is 6 km/s and diameter of debris is 10.4 nm. Influence of mirror surface profile on the degradation mechanism and the surface roughness is evaluated as well. From several molecular dynamics simulations, various degradations formed on the ultra precision surface due to the impact of space debris can be inferred, such as generation process of craters, sizes of craters, stress distribution and temperature of the specimen. It is clarified that the impact of debris makes worse the quality of the mirror surface at least nanometer level even by an impact of space debris in the size of several nanometer.
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