A Micromechanics‐Based Predictive Model for Damping Behavior of Resin‐Mineral Composites: Theory, Experiment, and Design Implications

Based on micromechanical theory, this paper develops a predictive model for the damping behavior of resin–mineral composites. This framework enables the quantitative prediction of macroscopic loss factors from constituent properties. The study compares the prediction accuracy of a two‐phase model with that of a three‐phase model, which incorporates a third phase (pores or an interfacial layer). Dynamic mechanical analysis experiments reveal the evolution of storage modulus ( E ′), loss modulus ( E ″), and loss factor ( η ) with temperature. As the filler volume fraction increases from 60% to 80%, the storage modulus rises from 8.86 to 13.37 GPa, while the loss factor decreases from 0.0362 to 0.0313. Theoretical predictions show that the two‐phase model yields average errors of approximately 18% for storage modulus and 10% for loss factor. In contrast, the three‐phase model reduces these errors to about 10% and 5%, respectively, demonstrating significantly improved agreement with experimental data. The three‐phase model captures coupled filler–matrix–interface damping, revealing that the interfacial phase enhances stiffness and provides extra energy dissipation. The proposed model therefore provides a theoretical basis for the structure–property relationship of resin–mineral composites, supporting their targeted design and performance optimization in vibration‐damping structures such as high‐precision machine tools.