Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 10, 2021 - March 11, 2021
To realize carbon fiber reinforced plastic (CFPR) mirror for a space telescope, high-precision polishing of the epoxy resin surface, which is the reflective surface of the mirror, is required. For this purpose, it is necessary to know the polishing characteristics, such as removal rate and surface roughness, of epoxy resin. Our previous polishing experiment of epoxy and acrylic resins showed that the removal rate of epoxy resin was approximately 90% lower than that of acrylic resin. In the present study, to clarify th reason for the differences in removal rate between these two resins, indentation and micro-scratch tests were carried out. The micro-scratch test enables to provide the shear strength of resin by acting a shear force on its surface. As a result, there was no significant differences in indentation hardness between epoxy and acrylic resins. However, the micro-scratch test revealed that the shear strength of epoxy resin was 67.5% higher than that of acrylic resin. These findings indicate that the difference in removal rate between the two resins is mainly due to the difference in the shear strength between the resin surfaces.
