抄録
Damping materials are essential for achieving precise and stable motion in high-speed robotics. In this study, a magnesium-based composite reinforced with 10 vol% of silicone powder (KMP-602) was developed to improve viscoelastic damping performance. The loss tangent (tanδ), an index representing the ratio of loss stiffness to storage stiffness, was measured using the nanoDMA function of a nanoindenter.
The results revealed that tanδ exhibited frequency-dependent behavior. In particular, tanδ showed relatively higher values in the 60–80 Hz range, indicating enhanced energy dissipation within this frequency band. However, the measurements also showed notable variation at the same frequency, with differences reaching up to three to four times across different test points.
Several factors likely contributed to this variability. These include incomplete mirror polishing of the sintered specimen surfaces, non-uniform dispersion of KMP-602 particles, and a mismatch between the nanoindenter’s shallow indentation depth (~1 μm) and the relatively large powder sizes used (180 μm for Mg, 30 μm for KMP-602). As a result, the local microstructure had a significant effect on the measurements.
Future work will focus on either employing evaluation methods better suited for heterogeneous microstructures or developing composite materials with finer, more uniform structures. These improvements are expected to reduce data variation and lead to a more accurate understanding of the composite’s damping properties.
https://ror.org/00pjwdc92 
