Numerical modeling of the damping capacity of Al/SiC( p )
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Numerical Modeling of the Damping Capacity of Al/SiC( p) JINCHENG WANG and GENCANG YANG In the present article, the damping behaviors of Al/SiC particulate-reinforced metal-matrix composites (PMMCs) at room temperature are investigated by the numerical modeling method. Through the cell method (CM) and finite-element method (FEM), the influences of particulate shape and distribution on the damping capacity of Al/SiC( p) composite are studied. Also, the case of multiparticulate with random distribution and random size is investigated as a comparison with the single-particulate case. At last, the simulation results are compared with the experimental results, which show that they are consistent with each other in quality.
I. INTRODUCTION
PARTICULATE-REINFORCED metal-matrix composites (MMCs) are of particular interest as a result of their feasibility for mass production, promising mechanical properties, and potentially high damping capacity.[1] The high damping materials are very valuable in suppressing mechanical vibration and attenuating wave propagation for the control noise and stabilization of structures.[2,3] And structural analysis suggests that if the composite could offer an adequate level of specific damping capacity, then the active and passive control measures used for the vibration suppression could be minimized significantly, which would reduce the number of complex active control systems required in weight and cost savings for future spacecrafts. On the other hand, with the advent of MMC technology, it becomes possible to modify the damping behavior, as well as other physical and mechanical properties, of metals and alloys by combining them with nonmetallic phases. Therefore, in recent years, there has been a great deal of literature[1–11] discussing the damping behaviors of particulate-reinforced MMCs, among which the most systematical study of damping behaviors of particulate-reinforced MMCs is the work of Zhang et al.,[1,10,11] who experimentally investigated the influences of different kinds of factors on the damping capacity of Almatrix particulate-reinforced MMCs, including types of particulate (SiC and graphite), volume fraction of the second phase, temperature, frequency, strain amplitude, and so on. The primary constituents of the MMC, namely, second phase and matrix, do provide individual contributions to the overall materials damping capacity. The damping response of MMC is associated with the operative microstructural mechanisms such as movements of atomic defects and grain boundaries and phase transformation in its constituents. As to the influences of the parameters of secondary phase on the damping behavior, generally speaking, second phases influence damping behavior of alloys by four possible mechanisms, which are interface, dislocation density, interaction, JINCHENG WANG, formerly Lecturer, State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, is Special Researcher with the High Temperature Materials 21 Project, National Institute for Materials Scien
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