Dynamic characterization and numerical modelling of automotive rubber connections

Mundo, Domenico; Mas, Peter; Clausi, Donato

doi:10.1243/09544070jauto44

Cited by 6 publications

(5 citation statements)

References 9 publications

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“…The complex transmissibility response of the system, H * (ω), that denote the amplification/attenuation of vibrations is (Mundo et al, 2006; Ramorino et al, 2003),…”

Section: Methodsmentioning

confidence: 99%

An experimental investigation on the matrix dependent rheological properties of MRE

Poojary,

Kiran,

Hegde

et al. 2023

Journal of Intelligent Material Systems and Structures

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The rheological properties of magnetorheological elastomers are influenced by magnetically sensitive fillers and the elastomer matrix. The ability to respond to an external magnetic field is imparted by the fillers, while the load-bearing capability is determined by the matrix type. In this paper, the effect of matrix material on the properties of magnetorhological elastomer is explored experimentally. Carbonyl iron particle content is varied by 0%, 15% and 25% by volume to produce magnetorheological elastomer samples using natural rubber, silicone rubber and nitrile butadiene rubber matrices. Forced transmissibility test approach was employed to evaluate the field induced variations in the dynamic stiffness and loss factor of magnetorheological elastomers. The dynamic stiffness of nitrile butadiene rubber is the highest, while that of silicone rubber is the lowest. Addition of carbonyl iron particles significantly improves stiffness, although these gains depend on the properties of unfilled matrix. The addition of 25% by volume of carbonyl iron particle increased the dynamic stiffness of a silicone rubber matrix based magnetorheological elastomer by 67.78%, while the similar change in magnetorheological elastomer with nitrile butadiene rubber matrix was 38.58%. The field dependent response of magnetorheological elastomers is governed by the matrix and ferromagnetic filler concentration. These qualities are higher in magnetorheological elastomer with a low initial dynamic stiffness matrix and lower in magnetorheological elastomers with a stiffer matrix.

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“…The complex transmissibility response of the system, H * (ω), that denote the amplification/attenuation of vibrations is (Mundo et al, 2006; Ramorino et al, 2003),…”

Section: Methodsmentioning

confidence: 99%

An experimental investigation on the matrix dependent rheological properties of MRE

Poojary,

Kiran,

Hegde

et al. 2023

Journal of Intelligent Material Systems and Structures

View full text Add to dashboard Cite

show abstract

“…Dynamic tests were performed on the MRE isolator for various harmonic excitations, and correspondingly the displacement transmissibility response was acquired (Mundo et al, 2006; Ramorino et al, 2003). Here onward, displacement transmissibility will be referred to as transmissibility.…”

Section: Methodsmentioning

confidence: 99%

“…From the magnitude and the phase plots of the transmissibility response, stiffness and the damping characteristics of the MRE isolator at the natural frequency are extracted (Mundo et al, 2006; Ramorino et al, 2003) and the corresponding values are listed in Table 1. The enhancement in the effective stiffness of the isolator is about 155% (0–3 A) which confirms the field-induced interactions between the ferromagnetic fillers.…”

Section: Methodsmentioning

confidence: 99%

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Fractional-order viscoelastic modeling of the magnetic field dependent transmissibility response of MRE isolator

Kiran

Poojary

Gangadharan

2022

Journal of Intelligent Material Systems and Structures

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In the present study, a modeling approach to estimate the parameters of the MRE isolator model with respect to the frequency-response curve is presented. To concur the response of the isolator over wide frequency range, fractional order based Kelvin Voigt model comprised of three parameters and the fractional Zener model having four parameters are proposed. An isolator operating in shear-mode is developed, and its performance is evaluated through the transmissibility tests. The parameters of the model are identified by minimizing the error between the transmissibility response from the MRE isolator model and the experimental results. A polynomial function is used to generalize the variation of these parameters with respect to the input current. The response predicted by the MRE isolator models confirms that both fractional Kelvin Voigt and fractional Zener modeling approaches are effective in portraying the transmissibility response. The fractional Zener MRE isolator model is more accurate and can reproduce the experimentally determined magnitude and phase response of the transmissibility with an accuracy greater than 91.5% and 84.87% respectively. On the contrary, the fractional Kelvin Voigt model is simpler in form, and it effectively reproduced the magnitude of the transmissibility response with an accuracy higher than 86.35% and the phase response greater than 83.77%.

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“…Once evaluated the kinetic constants involved in the reticulation process, the second phase relies in implementing kinetic model parameters within a nonstandard finite element (FEM) software for a thermal analysis of the item. Such approach follows a relatively long tradition regarding FEMs applied to thermo–mechanical problems of weather‐strips installed within devices subjected, after thermal curing, for static and dynamic loads [15–19]. FEM is, indeed, recognized as the most suitable technique to interpret the thermo–mechanical behavior of vulcanized rubber items with complex geometries, giving the possibility to quickly study combined nonlinear 3D problems, with error estimates and error reduction upon mesh refinements.…”

Section: Introductionmentioning

confidence: 99%

Kinetic finite element model to optimize sulfur vulcanization: Application to extruded epdm weather‐strips

Milani¹

2012

Polymer Engineering & Sci

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A numerical two-phase approach based on experimental scorch curve data fitting, to predict the optimal exposure time and cure temperature of extruded thick items is applied for the study of a real weather-strip. In the first phase, an existing single equation kinetic model is used to predict the crosslinking density under sulfur vulcanization at variable temperatures. The model requires the calibration of only three kinetic constants. The variation with respect to temperature of such parameters is then evaluated by means of two experimental cure curves performed at two different temperatures. In the second phase, kinetic reaction parameters are implemented in finite element software, to perform thermal analyses on an extruded weatherstrip. Once evaluated the final mechanical properties of the item point by point, a set of compression tests is numerically simulated, assuming that the rubber behaves as a Mooney-Rivlin material under the large deformations. Elastic properties of the item are evaluated as a function of the vulcanization degree evaluated in the second phase. It is found that suboptimal vulcanizations result into lower elastic moduli and hence great deformability, sometimes incompatible with real scale engineering applications. POLYM. ENG.

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Dynamic characterization and numerical modelling of automotive rubber connections

Cited by 6 publications

References 9 publications

An experimental investigation on the matrix dependent rheological properties of MRE

An experimental investigation on the matrix dependent rheological properties of MRE

Fractional-order viscoelastic modeling of the magnetic field dependent transmissibility response of MRE isolator

Kinetic finite element model to optimize sulfur vulcanization: Application to extruded epdm weather‐strips

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