Study on Multi-Point Random Contact Characteristics of Metal Rubber Spiral Mesh Structure

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.INDEX TERMS MR, finite element model, dynamic contact, fretting slip Friction, damping energy consumption.

Mechanical Property Degradation of Entangled Metallic Wire Materials under Vibration Environment: Experiments and Prediction Models

“…Additionally, computed tomography (CT) scanning was performed on the specimens to generate a three-dimensional structure, as shown in Figure 12. The continuity of the metallic wires within the EMWM specimens was confirmed using the search algorithm described in Reference [38], and no wire fractures were detected. This finding suggests that the the primary failure mode of the EMWM was irreversible deformation in the compression direction rather than fracture, fatigue or wear of the metallic wires.…”

Stiffness Constitutive Characteristics of Elastic Disordered Microporous Metal Rubber Considering Temperature Effects

“…During the fabrication process of EDMMR, the complex interlocking and embedding of helical coils present challenges in accurately assessing the microscale deformation of metal wires within EDMMR under high temperatures and external loads. To address this, a finite element model was developed using virtual manufacturing technology (VMT) for EDMMR, [ 17 ] which closely approximates the size and configuration of the actual specimen. This technique enables a more realistic simulation of the microscale wire deformation behavior inside EDMMR.…”

Research on Trajectory Optimization of Multilateral Thin Metal Rubber Automatic Laying Based on Virtual Fabrication Technology

“…To have an enough engagement and high stability between the threads in the blank, the pitch and the diameter of the coil should be approximately the same. [ 16 ] After a certain number of layers are laid, the rolling mechanism is used for shaping to maintain the hook stability of the blank. To ensure the stable winding of the spiral coil during laying and standardize the laying rules of an automatic laying process, the laying path rules are as follows.…”