scispace - formally typeset
Search or ask a question
Author

Leif Kari

Bio: Leif Kari is an academic researcher from Royal Institute of Technology. The author has contributed to research in topics: Natural rubber & Audio frequency. The author has an hindex of 21, co-authored 105 publications receiving 1371 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a time-discrete variant of full-3D friction contact model is reformulated, and an analytical expression of the Jacobian matrix is obtained for the same.

40 citations

Journal ArticleDOI
TL;DR: In this article, the high-Velocity compaction (HVC) process for powder polymers has been studied, with a focus on the compactibility characteristics and surface morphology of the compacted materials.

40 citations

Journal ArticleDOI
TL;DR: Comparison between the application of polymer- and phospholipid-shelled ultrasound contrast agents (UCAs) for characterization of the capillary microcirculation is reported and results suggest that the novel polymer- shelled microbubbles have a potential to be used for perfusion evaluation.

36 citations

Journal ArticleDOI
TL;DR: In this article, a phenomenological uniaxial model is derived for implementation in the time domain, which captures the amplitude and frequency dependency of filled elastomers, motivated by the experimental observation that the frequency dependency is stronger for smaller strain amplitudes than for large ones.

32 citations

Journal ArticleDOI
TL;DR: An indirect measurement method for blocked dynamic transfer stiffness of vibration isolators in the audible frequency range, up to 1000 Hz, including static preload and all six degrees of freedom is presented in this paper.
Abstract: An indirect measurement method for blocked dynamic transfer stiffness of vibration isolators in the audible frequency range, up to 1000 Hz, including static preload and all six degrees of freedom is presented, Techniques for improving the stiffness accuracy are discussed in some detail, To suppress (unwanted) coupling effects between different degrees of freedom an improved excitation and terminating arrangement is adopted. Source correlation technique and stepped sine excitation are applied, increasing the signal-to-noise ratio. Computationally, a heavy blocking mass is replaced by its effective mass in the high frequency region, while using an overdetermined stiffness equation system. This is possible by applying various blocking masses, measuring acceleration at several positions and repeating the measurements. The method applied to a cylindrical vibration isolator at four axial preloads, results in smooth stiffness magnitude and phase curves, displaying antiresonances, resonances and the expected preload dependence, The test rig flanking transmission is shown to be negligible, while applying an auxiliary isolator decoupled test set-up, embedded in a heavy rigid frame construction, The stiffness error due to non-vanishing motion of the blocking mass is also shown to be negligible,

29 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, the authors focus on the important role and challenges of high-k polymer-matrix composites (PMC) in new technologies and discuss potential applications of highk PMC.

1,412 citations

Journal ArticleDOI
TL;DR: In this paper, a comprehensive assessment of recent developments of nonlinear isolators in the absence of active control means is presented, which highlights resolved and unresolved problems and recommendations for future research directions.

885 citations

Journal ArticleDOI
TL;DR: In this article, the authors present 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.
Abstract: 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

491 citations

Journal ArticleDOI
TL;DR: In this paper, the structural damping characteristics of polymeric composites containing single-walled carbon nanotubes (SWNTs) were investigated, with a focus on analyzing the interfacial interaction between the CNT and the resin materials.

348 citations

01 Jan 2016
TL;DR: Formulas for natural frequency and mode shape is available in the authors' book collection an online access to it is set as public so you can get it instantly.
Abstract: formulas for natural frequency and mode shape is available in our book collection an online access to it is set as public so you can get it instantly. Our book servers hosts in multiple countries, allowing you to get the most less latency time to download any of our books like this one. Kindly say, the formulas for natural frequency and mode shape is universally compatible with any devices to read.

333 citations