Showing papers by "Leif Kari published in 2011"
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
TL;DR: In this paper, a constitutive model of magneto-sensitive rubber in the audible frequency range is presented, which includes magnetic sensitivity, amplitude dependence, elasticity and viscoelasticity.
28 citations
TL;DR: In this paper, an audio-frequency wave-guide model for antisymmetric dynamic stiffness of arbitrary long elastomer cylinders is presented, which is based on a fractional derivative of a standard linear solid embodying a Mittag-Leffler relaxation kernel.
10 citations
TL;DR: In this paper, a model of the elastoplastic shock wave propagation in a one-dimensional assembly of spherical metal particles is presented by extending well-established quasistatic compaction models.
Abstract: Elastoplastic shock wave propagation in a one-dimensional assembly of spherical metal particles is presented by extending well-established quasistatic compaction models. The compaction process is modeled by a discrete element method while using elastic and plastic loading, elastic unloading, and adhesion at contacts with typical dynamic loading parameters. Of particular interest is to study the development of the elastoplastic shock wave, its propagation, and reflection during entire loading process. Simulation results yield information on contact behavior, velocity, and deformation of particles during dynamic loading. Effects of shock wave propagation on loading parameters are also discussed. The elastoplastic shock propagation in granular material has many practical applications including the high-velocity compaction of particulate material.
5 citations
Journal Article•
TL;DR: In this article, the dynamic response of a chain of non-homogenous spherical particles is modeled by using elastic and plastic loading, and a discrete element method is used to model the response of the particles.
1 citations