Abstract
Metal rubber (MR) is a porous damping material, which achieves the damping energy consumption by the contact friction between the internal wires. Complex wire structure makes explanation of energy dissipation mechanism by the traditional theoretical models limited to comparison with equivalent models or microcell models, which cannot truly reflect the spatial multi-point contact characteristics of each wire. This work demonstrates numerical modeling based on actual preparation process parameters of annular MR. Using the penalty function to solve the complex contact that is difficult to predict between the internal spiral wires, the variation laws for equivalent stress and strain recorded during the loading-unloading process of MR, were obtained. The small-ball algorithm and the Tabu search algorithm were used to realize the accurate assessment of contact points between the wires and the hyper dimension matrix was used to track the friction state of the contact points in real time, thereby obtaining a proportional relationship between various friction forms during the loading-unloading process. It is found that sliding friction accounts for the majority of the total number of contact points, which is about 81.38%, consistent with the equivalent plastic strain law of stepwise change. It becomes further clarified from the microscopic point that MR accomplishes macroscopic energy dissipation mechanism through the fretting slip friction between the internal wires. In order to verify the authenticity of the simulation, a quasi-static loading-unloading experiment of MR was carried out under identical parameters, and the experimental macroscopic results were in excellent agreement with the simulation results. The research indicates that the MR finite element model established in this paper can precisely describe the dynamic contact of the internal structural features of MR materials, for providing a theoretical basis for guiding the preparation and application of MR.
Highlights
Metal rubber (MR) is a porous functional material (Fig.1(a))
In order to study the micro-mechanical properties of MR, in this paper, based on the preparation process of annular
The small ball algorithm, Tabu search algorithm and the hyper-dimension space matrix were used to achieve the accurate estimation of the contact points of the wires and real-time tracking of the friction states, thereby obtaining the proportional relationship of various friction states
Summary
MR is a porous functional material (Fig.1(a)). Compared with ordinary rubber products, MR has obvious advantages in improving the life, reliability and performance of aerospace, naval equipment and cutting-edge military products under special working conditions [1]. Cao et al [15] proposed a micro-structure element based on interaction between variable length curved beams by analyzing the spatial structures and contact forms of the wires during compression deformation Such equivalent models deviate from the complexity of actual working conditions, and its accuracy needs to be further improved. We report a finite element model for the structure of spiral wires considering the material properties of MR, wire geometry and winding process parameters This model has been established for studying the changes in stress and strain between wires along with exploration of the variation in the regularities of the friction forms of contact points between internal spiral wires during the MR’s loading-unloading process and clarifying the macroscopic mechanism of damping energy dissipation in MR from microscopic point of view thereby providing theoretical bases for effective design of MR. The spatial spiral wires having a certain trajectory, were generated by transforming the local coordinate system to change the generation trajectory of the generatrix continuously
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