Blar i NTNU Open på forfatter "Skallerud, Bjørn Helge"
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Finite element analysis of mitral valve annuloplasty in Barlow's disease
Aguilera, Hans Martin; Urheim, Stig; Persson, Robert; Haaverstad, Rune; Skallerud, Bjørn Helge; Prot, Victorien Emile (Peer reviewed; Journal article, 2022)Barlow’s Disease affects the entire mitral valve apparatus causing mitral regurgitation. Standard annuloplasty procedures lead to an average of 55% annular area reduction of the end diastolic pre-operative annular area in ... -
Finite Element Approach to Estimating Shell Properties of Nanoparticle-stabilized Microbubbles
Morton, Daniel Thor (Master thesis, 2016)The application of nanoparticle-stabilized microbubbles (NP-MBs) for localized drug delivery is a new and promising method for enhancing the effectiveness of administered drugs. The NP-MBs move through the vascular system ... -
Fluid structure interaction aspects in obstructive sleep apnea patients
Hole, Øyvind (Master thesis, 2017)In this master thesis, a comparative study of the feasibility of fluid-structure interaction (FSI) tools has been done in light of simulating the problem of obstructive-sleep apnea (OSA). Part of the study has been done ... -
Fourier transform-based method for quantifying the three-dimensional orientation distribution of fibrous units
Alberini, Riccardo; Spagnoli, Andrea; Sadeghinia, Mohammed Javad; Skallerud, Bjørn Helge; Terzano, Michele; Holzapfel, Gerhard (Peer reviewed; Journal article, 2024)Several materials and tissues are characterized by a microstructure composed of fibrous units embedded in a ground matrix. In this paper, a novel three-dimensional (3D) Fourier transform-based method for quantifying the ... -
Grain-size Induced Strengthening and Weakening of Dislocation-free Polycrystalline Gas Hydrates
Wu, Jianyang; Skallerud, Bjørn Helge; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2017)Sediment-hosted gas hydrates have profound impacts on global energy sources and climate change. Their mechanical properties play a crucial role in gas recovery and understanding their evolution in nature, however, the ... -
In silico analysis provides insights for patient-specific annuloplasty in Barlow's disease
Aguilera, Hans Martin Dahl; Persson, Robert; Haaverstad, Rune; Skallerud, Bjørn Helge; Prot, Victorien Emile; Urheim, Stig (Peer reviewed; Journal article, 2023)Objective To predict the required mitral annular area reduction in patients with Barlow's disease to obtain a predefined leaflet area index by a novel in silico modeling method. Methods Three-dimensional echocardiography ... -
Influence of Annular Dynamics and Material Behavior in Finite Element Analysis of Barlow’s Mitral Valve Disease
Aguilera, Hans Martin; Urheim, Stig; Skallerud, Bjørn Helge; Prot, Victorien Emile (Peer reviewed; Journal article, 2021)Barlow’s disease affects the entire mitral valve apparatus, by altering several of the fundamental mechanisms in the mitral valve which ensures unidirectional blood flow between the left atrium and the left ventricle. In ... -
Macro-indentation testing of soft biological materials and assessment of hyper-elastic material models from inverse finite element analysis
Ayyalasomayajula, Venkat Siva Radha Krishna; Ervik, Øyvind; Sorger, Hanne; Skallerud, Bjørn Helge (Peer reviewed; Journal article, 2024)Mechanical characterization of hydrogels and ultra-soft tissues is a challenging task both from an experimental and material parameter estimation perspective because they are much softer than many biological materials, ... -
Mechanical behavior and collagen structure of degenerative mitral valve leaflets and a finite element model of primary mitral regurgitation
Sadeghinia, Mohammadjavad; Aguilera, Hans Martin Dahl; Urheim, Stig; Persson, Robert; Ellensen, Vegard Skalstad; Haaverstad, Rune; Holzapfel, Gerhard; Skallerud, Bjørn Helge; Prot, Victorien Emile (Peer reviewed; Journal article, 2023)Degenerative mitral valve disease is the main cause of primary mitral regurgitation with two phenotypes: fibroelastic deficiency (FED) often with localized myxomatous degeneration and diffuse myxomatous degeneration or ... -
Mechanical behaviour of particlefilled elastomers at various temperatures: An experimental and numerical study
Ilseng, Arne (Doctoral theses at NTNU;2016:295, Doctoral thesis, 2016)Numerical tools that facilitate predictions of the mechanical behaviour of elastomeric products exposed to various temperatures have great cost saving potentials in multiple industries. To unleash these potentials, precise ... -
Mechanical instability of monocrystalline and polycrystalline methane hydrates
Wu, Jianyang; Ning, Fulong; Trinh, Thuat; Kjelstrup, Signe; Vlugt, Thijs J.H.; He, Jianying; Skallerud, Bjørn Helge; Zhang, Zhiliang (Journal article; Peer reviewed, 2015)Despite observations of massive methane release and geohazards associated with gas hydrate instability in nature, as well as ductile flow accompanying hydrate dissociation in artificial polycrystalline methane hydrates ... -
MekIT’17 - Ninth national conference on Computational Mechanics
Skallerud, Bjørn Helge; Andersson, Helge Ingolf (Book, 2017) -
Microstructure and mechanics of the bovine trachea: Layer specific investigations through SHG imaging and biaxial testing
Ayyalasomayajula, Venkat Siva Radha Krishna; Skallerud, Bjørn Helge (Peer reviewed; Journal article, 2022)The trachea is a complex tissue made up of hyaline cartilage, fibrous tissue, and muscle fibers. Currently, the knowledge of microscopic structural organization of these components and their role in determining the tissue’s ... -
Mode I stress intensity factors for semi-elliptical fatigue cracks in curved round bars
Aursand, Mads; Skallerud, Bjørn Helge (Peer reviewed; Journal article, 2021)Some cyclically loaded components such as mooring chains can develop fatigue cracks in locations where the shape of the part is equivalent to that of a curved or bent round bar. Here we consider a semi-elliptical crack ... -
Modeling and simulation of the soft palate for improved understanding of the obstructive sleep apnea syndrome
Liu, Hongliang (Doctoral theses at NTNU;2018:101, Doctoral thesis, 2018)Obstructive sleep apnea (OSA) influences a large part of the population and is increasingly recognized as a major global health problem. For OSA patients, the collapse of the soft palate has been clarified to be a common ... -
Multiaxial fatigue analysis of offshore mooring chains, considering the effects of residual stresses and corrosion pits
Zarandi, Ershad P. (Doctoral theses at NTNU;2020:337, Doctoral thesis, 2020)The integrity of the mooring lines used to anchor offshore facilities and floating platforms has been always desired while its continuous achievement has been challenging. Many mooring line failures have occurred in the ... -
Nano-Indentation of Anisotropic Material: Numerical Approaches to Extract Elasticities from Nano-Indentation
Sveaass, Tore (Master thesis, 2013)Division of Biomechanics participates in a project together with Department of Cancer Research and Molecular Medicine, NTNU, on effects of proton pump inhibitor medication on bone quality. This common anti-stomach acid ... -
Numerical Analysis of Primary Stability on Cementless Hip Prostheses
Olufsen, Sindre Nordmark (Master thesis, 2012)Since the first Total Hip Arthroplasty (THA) performed in the 60's, it has been regarded among the most successful surgical procedures. When an un-cemented hip prosthesis is employed, the prosthesis is impacted into a ... -
Numerical modeling of diseased mitral valves
Aguilera, Hans Martin Dahl (Doctoral theses at NTNU;2023:273, Doctoral thesis, 2023)In this thesis, we have developed methods to create digital replicas of patients’ mitral valves from echocardiographic images and perform structural simulations in a finite element framework. The methods allow us to study ... -
Numerical Modelling and Analysis of the Left Ventricle
Slinde, Gaute Aasen (Master thesis, 2015)The development of a well functioning finite element model of the left ventricle is an important step to better understand the pumping function of the human heart. This may be of interest when developing effective treatments ...