Experimental characterization and analytical modeling of a large-capacity high-damping rubber damper

Abstract

Summary This study explores the mechanical response of a high‐damping rubber damper (HRD) under different loading conditions. HRD is a typical viscoelastic damper that consists of 2 layers of elastomer compound sandwiched between 3 steel plates. The elastomer compound used in this study is a synthetic isoprene rubber reinforced with carbon black and designed to provide high damping capacity with relatively low stiffness. Four damper specimens with a displacement capacity of 75 mm at 300% shear strain were fabricated. Each damper was subjected to harmonic loading to investigate the effects of strain amplitude, loading frequency, strain history, and cyclic loading on the mechanical properties of HRD. Hysteretic force–displacement loops for each loading condition were plotted, and the variations of maximum damper force, equivalent stiffness, storage shear modulus, dissipated energy, loss factor, and equivalent viscous damping ratio with different test parameters were examined. In addition, an analytical model capable of simulating behavior of HRD at various strain amplitudes and loading frequencies was proposed. The experimental results indicate that the developed HRD can provide a damping ratio ranging from 15% to 43% under different loading conditions and has relatively stable hysteresis loops under cyclic loads. In addition, the energy dissipation capacity of the damper significantly increases when the loading frequency is over 0.5 Hz without an increase in stiffness.

Design, manufacturing, and testing of a hybrid self‐centering brace for seismic resilience of buildings

“…[33][34][35][36][37] Previous experimental studies 49,50 reveal that the training of SMA material has a considerable effect on the cyclic stability of the mechanical response. On the other hand, rubble-like viscoelastic materials also show mechanical degradation after experiencing large strains, [51][52][53] that is, the Mullins effect. In order to investigate the effect of training on the cyclic stability of the HSB, the HSB-II specimen is first cyclically loaded at a loading frequency of 0.1 Hz at 30 mm for thirty cycles.…”

Development and investigation of an innovative shape memory alloy cable‐controlled self‐centering viscoelastic coupling beam damper for seismic mitigation in coupled shear wall structures

“…In this study, the Mooney-Rivlin model was used to simulate the hyper-elastic properties of viscoelastic materials, and the Prony series model was used to simulate the viscoelastic properties of viscoelastic materials. 63 Previous studies show that for small deformation conditions, that is, shear strain γ ≤ 150%, when the Mooney-Rivlin model is used to simulate the characteristics of hyper-elastic materials, the relationship between the elastic modulus E 0 of viscoelastic materials and steady shear modulus G can be E 0 = 3G = 6 (C 10 + C 01 ), C 01 /C 10 = 0.05, Poisson's ratio ν = 0.4997. The parameters of the Prony series can be determined according to previous studies, 64 and the relationship between the storage modulus, energy dissipation modulus, and viscosity parameters of viscoelastic rubber materials under different excitation frequencies can be transformed using the Laplace transform shown in Equations ( 1) and (2).…”

“…G I = G I /( G I + G ∞ ). To ensure the reliability of the finite element entity simulation, the viscoelastic damper test performed by Zhou and Shi 65 was selected to verify the aforementioned implementation method.…”

Study on the performance of a gear‐driven rotation‐amplified rubber viscoelastic damper and its vibration control of a frame structure

“…F Max is the Maxwell model. The parameters of α 2 , k 2 , and C are selected to regulate the variations in stiffness and damping at different shear deformations 53 . a 1 , a 2 , and a 3 are parameters of the Mullins Effect model F Mul .…”