Fundamentals, processes and applications of high-permittivity polymer–matrix composites

Recent advances in nonlinear passive vibration isolators

The present state-of-the-art article is devoted to the analysis of new trends and recent results carried out during the last 10 years in the field of fractional calculus application to dynamic problems of solid mechanics. This review involves the papers dealing with study of dynamic behavior of linear and nonlinear 1DOF systems, systems with two and more DOFs, as well as linear and nonlinear systems with an infinite number of degrees of freedom: vibrations of rods, beams, plates, shells, suspension combined systems, and multilayered systems. Impact response of viscoelastic rods and plates is considered as well. The results obtained in the field are critically estimated in the light of the present view of the place and role of the fractional calculus in engineering problems and practice. This articles reviews 337 papers and involves 27 figures. DOI: 10.1115/1.4000563

Application of Fractional Calculus for Dynamic Problems of Solid Mechanics: Novel Trends and Recent Results

Interfacial damping characteristics of carbon nanotube-based composites

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Formulas For Natural Frequency And Mode Shape

Powertrain shuffle-mode resonance suppression by means of flywheel mounted torsichrone centrifugal pendulum vibration absorbers

Magneto-sensitive elastomers consist of irregularly shaped, magnetically polarizable iron particles embedded in a rubber matrix, that instantly and reversibly alter their mechanical properties under the influence of an external magnetic field. A non-linear constitutive model, the stress depending upon the frequency, magnetic field strength, dynamic strain amplitude and static prestrain, is presented and experimentally verified. Finally, magneto-sensitive elastomers applied in a vibration isolation system are experimentally investigated with a focus on the energy flow transmitted into the receiving structure. The paper covers magneto-sensitive elastomer modeling, experiments and applications.

Magneto-sensitive elastomers—theory and applications

Filler reinforced rubber is widely used for engineering applications; therefore, a sound characterization of the effects of physical aging is crucial for accurately predicting its viscoelastic properties within its operational temperature range. Here, the torsion pendulum is used to monitor the evolution of the storage and loss modulus of carbon black filled samples for four days after a temperature drop to 30 °C. The storage modulus presents a continuous increase, while the loss modulus generally displays a steady decrease throughout the four days that each test was conducted. The relationship of the recovery rates with the carbon black properties is also studied, analysing its dependency on the particle size and aggregate structure. The evolution of the recovery rate seems to depend linearly on the surface area while the carbon black structure appears to have a much weaker influence on the physical aging behavior for the set of compounds tested. The obtained results corroborate the presence of physical aging at room temperature for filler rubber materials and the ability of the torsion pendulum to monitor the storage and loss modulus change, providing pivotal data on the influence of physical aging on the viscoelastic properties of the material.

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Evolution of the Viscoelastic Properties of Filler Reinforced Rubber under Physical Aging at Room Temperature

A phenomenological material model for carbon black filled natural rubber based on the multiplicative split of the deformation gradient is implemented for finite strains in three dimensions. This is ...

Leif Kari

Papers

Powertrain shuffle-mode resonance suppression by means of flywheel mounted torsichrone centrifugal pendulum vibration absorbers

Magneto-sensitive elastomers—theory and applications

Evolution of the Viscoelastic Properties of Filler Reinforced Rubber under Physical Aging at Room Temperature

A finite strain viscoplastic constitutive model for filled rubber

Analysis of stationary displacement patterns in rotating machinery subject to local harmonic excitation