scispace - formally typeset
Search or ask a question

Showing papers by "Leif Kari published in 2012"


Journal ArticleDOI
TL;DR: In this paper, a dynamic torsional stiffness model of a magneto-sensitive circular annular rubber bushing is presented where influences of frequency, amplitude and magnetic field dependence are included.

22 citations


Journal ArticleDOI
TL;DR: In this paper, the dynamic shear modulus of magnetosensitive (MS) natural rubber composites is experimentally studied, where influences of carbon black, plasticiser and iron particle concentrations are investigated at various dynamicShear strain amplitudes and external magnetic fields within the lower structure borne frequency range.
Abstract: The dynamic shear modulus of magnetosensitive (MS) natural rubber composites is experimentally studied, where influences of carbon black, plasticiser and iron particle concentrations are investigated at various dynamic shear strain amplitudes and external magnetic fields within the lower structure borne frequency range. The iron particles embedded in natural rubber are irregularly shaped and randomly distributed; the plasticisers simplify the iron particle blending process, while carbon black reduces the production costs and improves the mechanical properties. The results show that the relative MS effect on the shear modulus magnitude increases with increased plasticiser and iron particle concentration and decreases with increased carbon black concentration. Furthermore, their relative contributions are quantified. Consequently, the study provides a basis for optimising the composition of MS natural rubber to meet a variety of requirements, including those of vibration isolation, a promising appli...

19 citations


Journal ArticleDOI
TL;DR: The effectiveness of highly nonlinear, frequency, amplitude and magnetic field dependent magneto-sensitive natural rubber components applied in a vibration isolation system is experimentally evaluated in this article, where the results show that the rubber components are effective in vibration isolation.

18 citations


Journal ArticleDOI
TL;DR: In this article, the discrete element method is used to investigate the high-velocity compaction process with additional piston supports known as relaxation assists, and it is shown that by incorporating the relaxation...

13 citations


Proceedings ArticleDOI
06 Sep 2012
TL;DR: In this article, non-linear elasto-plastic shock waves in particle systems at high-velocity compaction are simulated by the discrete element method, where contact laws applied between the spherical metal particles include nonlinear elastic and plastic loading, adhesion and elastic unloading.
Abstract: Non-linear elasto-plastic shock waves in particle systems at high-velocity compaction are simulated by the discrete element method. The contact laws applied between the spherical metal particles include non-linear elastic and plastic loading, adhesion and elastic unloading. Of particular interest is to study the transmission and reflection of non-linear shock waves through a particle system with and without voids between the particles. Interesting results are presented in the paper including the particle deformation at incident and reflected shocks and particle velocity oscillations as a result of voids. The study of non-linear elasto-plastic shock waves in particle systems has a strong practical relevance including high-velocity compaction of metal powder.

3 citations


Journal ArticleDOI
TL;DR: A weak form of the Biot's equation represented in a cylindrical coordinate system using a spatial Fourier expansion in the circumferential direction is presented in this paper, where the original three dim dim lights are used.
Abstract: A weak form of the anisotropic Biot's equation represented in a cylindrical coordinate system using a spatial Fourier expansion in the circumferential direction is presented. The original three dim ...

3 citations


Journal Article
TL;DR: In this article, an experimental study was conducted where the prestrain dependence of magneto-sensitive rubber in the audible frequency range is studied along with the dependence of the dynamic strain amplitude, fr
Abstract: An experimental study is conducted where the prestrain dependence of magneto-sensitive rubber in the audible frequency range is studied along with the dependence of the dynamic strain amplitude, fr ...

1 citations