Life time of vibration isolators made of MR material subjected to random loads

Уланов, А. М.; Bezborodov, Sergey

doi:10.18287/1998-6629-2014-0-1(43)-159-165

Cited by 6 publications

(5 citation statements)

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“…Considering strong vibration conditions, Lu [4] conducted comparative experiments on metal wire having a single-phase austenite structure state to investigate the fatigue performance. Ulanov [5] conducted fatigue tests on MR isolators under random loads and analyzed the influence rules of structural parameters, such as the relative density and wire diameter, on the life of the isolators. Cao and Qiao [6,7] studied the influence of different amplitudes on the fatigue test results of MR.…”

Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Cross-scale fretting failure mechanism and fatigue failure prediction of metal rubber

Bai

Shi

Guo

et al. 2022

Preprint

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Metal rubber (MR) is a kind of elastic porous material with a complex and disordered internal structure, which results in a life evaluation that can only rely on tests but cannot meet the engineering application. This paper presents an interesting life prediction method based on its virtual fabrication technology. By developing the intricate internal multipoint random contact mesh model of MR, a virtual real-time dynamic tracking contact point in the state is captured. A thorough investigation is conducted into the contact point properties, point distribution, and the interaction of discrete contact points in MR interior space. Accordingly, a cross-scale fretting failure mechanism from micromorphology to macro-performance is proposed. The continuous fatigue cycle of MR is discretized into multiple single-turn metal wire elements by applying the principle of equal spacing. A statistical model of internal contact point wear of MR at the microlayer is developed considering the metal wire's single-turn fretting wear prediction model. The cumulative prediction model of macroscopic fatigue damage of MR is based on the superposition of micro-element interval. Finally, the fitting degree between the mass loss with loss factor and stiffness degradation degree after performing fatigue tests under different periods is investigated. A fatigue failure prediction model of metal rubber is established. The results of the fatigue failure prediction models are compared with experimental data and found to be consistent.

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Section: Introductionmentioning

confidence: 99%

WITHDRAWN: Cross-scale fretting failure mechanism and fatigue failure prediction of metal rubber

Bai

Shi

Guo

et al. 2022

Preprint

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“…Many experiments have shown that the MR is a nonlinear dry friction damping material with good deformation self-reset ability [9][10][11][12][13]. The material has a double-line functional constitutive relationship (memory resilience).…”

Section: Constitutive Model Of Mrmentioning

confidence: 99%

Seismic Response of Reinforced Concrete Frame-Shear Wall Structure with Metal Rubber-Based Damper in Coupling Beam

Zhao¹,

Dong²

2020

ACSM

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In reinforced concrete (RC) frame-shear wall structure, the coupling beam needs to yield before the wall limbs are damaged, in order to dissipate the energy of the external load. However, the coupling beam has a limited energy dissipation capacity. Once severely damaged, the coupling beam is difficult to be repaired, which hinders the structural recovery after an earthquake. Considering excellence of metal rubber (MR) in hysteresis energy dissipation and deformation self-reset, this paper changes the energy dissipation mode of the coupling beam by adding an MR damper to the beam. Firstly, the stress-strain curve of MR was obtained through mechanical experiments, and used to construct the constitutive model of the material. Then, the parameters of the damper were designed based on the constitutive model. Next, the MR dampers were installed on the coupling beams of a 12-layer RC frame-shear wall structure. The authors analyzed the time histories of the elastoplastic dynamics of the structure under seismic actions, and calculated the seismic responses like interlayer displacement, absolute acceleration, and base shear force. These parameters were compared with those of the structure without the damper, and the output-deformation envelope curve of the damper on each layer were obtained. In this way, the authors studied how the parameters of the MR damper affect the seismic response of RC frame-shear wall structure. The results show that adding the MR damper to coupling beam can effectively weaken the seismic response of the RC frame-shear wall structure.

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“…MR is being widely applied in fields of construction machinery, military, aerospace, and marine ships due to its features of large damping, light weight, good flexibility, high impact energy absorption, resistance to high and low temperature effects, and resistance to aging [3][4][5][6][7]. Numerous experiments have proved that MR is a non-linear dry friction damping material with good deformation self-recovery ability [8][9][10][11]. Besides having a bi-polyline functional constitutive relation (memory recovery ability), its elastic recovery force contains obvious cubic nonlinear component during non-memory recovery [12], while the linear viscous damping term in the main component in the damping force, and the high-order speed term could be ignored.…”

Section: Introductionmentioning

confidence: 99%

An Experiment on the Mechanical Properties of Metal Rubber Processed by Improved Processing Techniques and the Construction of Its Constitutive Relation

Dong¹,

Zhao²,

Rasmussen³

et al. 2021

IJHT

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To figure out the performance of dampers made of metal rubber (MR) that are installed in bridge and frame shear wall structures to change the energy consumption mode of artifacts, experiments were performed on the MR material processed by improved processing techniques to test its compression and shear hysteresis properties in high-temperature environment, and discover the laws of the impact of factors such as the improved processing techniques and temperature on the compression and shear hysteresis of the material. At the same time, based on test curves and the strain hardening laws of the material, this paper employed the least square method to perform piecewise linear fitting on MR curves, and the corresponding strain hardening constitutive model was established and verified. The study suggests that, after processed by the improved processing techniques, the compression and shear hysteresis energy consumption performance of the MR test pieces is very stable, and the shear strength had been improved. As the temperature increases, the metal rubber consumes more vibrational energy, and the stiffness of MR vibration isolator increases as well; at a same temperature, as the strain amplitude and relative density increase, the vibrational energy consumed by the MR damping material increases accordingly. The simplified constitutive model constructed in the paper has a simple form, it can not only describe the strain hardening features of the material, but also conform to the test curves, therefore, it can facilitate the parameter design and the calculation of MR dampers. The research conclusions obtained in this paper can provide theoretical and experimental evidence for the processing, preparation, and application of MR dampers, and it is of very important theoretical significance and practical value.

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Life time of vibration isolators made of MR material subjected to random loads

Cited by 6 publications

References 0 publications

WITHDRAWN: Cross-scale fretting failure mechanism and fatigue failure prediction of metal rubber

WITHDRAWN: Cross-scale fretting failure mechanism and fatigue failure prediction of metal rubber

Seismic Response of Reinforced Concrete Frame-Shear Wall Structure with Metal Rubber-Based Damper in Coupling Beam

An Experiment on the Mechanical Properties of Metal Rubber Processed by Improved Processing Techniques and the Construction of Its Constitutive Relation

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