Browsing NTNU Open by Author "Kiendl, Josef"
Now showing items 1-20 of 27
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A displacement-free formulation for the Timoshenko beam problem and a corresponding isogeometric collocation approach
Kiendl, Josef; Auricchio, Ferdinando; Reali, Alessandro (Journal article; Peer reviewed, 2017)We present a reformulation of the classical Timoshenko beam problem, resulting in a single differential equation with the rotation as the only primal variable. We show that this formulation is equivalent to the standard ... -
A framework for isogeometric-analysis-based optimization of wind turbine blade structures
Herrema, Austin; Kiendl, Josef; Hsu, Ming-Chen (Journal article; Peer reviewed, 2018)Early‐stage wind turbine blade design usually relies heavily on low‐fidelity structural models; high‐fidelity, finite‐element‐based structural analyses are reserved for later design stages because of their complex workflows ... -
A natural framework for isogeometric fluid-structure interaction based on BEM-shell coupling
Heltai, Luca; Kiendl, Josef; DeSimone, Antonio; Reali, Alessandro (Journal article; Peer reviewed, 2017) -
A Numerical and Experimental Study of a Multi-torus Floating Solar Island Concept
Sigstad, Mari Vassdokken (Master thesis, 2019)En flytedel som skal brukes til plattform for en flytende soløy er testet i modellskala både med og uten solcellepaneldekket. En realistisk skalert membran er brukt for å tilsvare dekket. Begge modellene ble testet både i ... -
A simplified Kirchhoff–Love large deformation model for elastic shells and its effective isogeometric formulation
Leonetti, Leonardo; Magisano, Domenico; Madeo, Antonio; Garcea, Giovanni; Kiendl, Josef; Reali, Alessandro (Journal article; Peer reviewed, 2019)Isogeometric Kirchhoff–Love elements have received an increasing attention in geometrically nonlinear analysis of elastic shells. Nevertheless, some difficulties still remain. Among the others, the highly nonlinear expression ... -
An anisotropic constitutive model for immersogeometric fluid-structure interaction analysis of bioprosthetic heart valves
Wu, M.C.H.; Zakerzadeh, R.; Kamensky, David; Kiendl, Josef; Sacks, Michael; Hsu, Ming-Chen (Journal article; Peer reviewed, 2018)This paper considers an anisotropic hyperelastic soft tissue model, originally proposed for native valve tissue and referred to herein as the Lee–Sacks model, in an isogeometric thin shell analysis framework that can be ... -
An isogeometric analysis formulation for red blood cell electro-deformation modeling
Nodargi, Nicola; Kiendl, Josef; Bisegna, Paolo; Caselli, Federica; De Lorenzis, Laura (Journal article; Peer reviewed, 2018)An isogeometric analysis formulation for simulating red blood cell (RBC) electro-deformationis presented. Electrically-induced cell deformation experiments are receiving increasing attention as an attractive strategy for ... -
An isogeometric collocation method for frictionless contact of Cosserat rods
Weeger, Oliver; Narayanan, Bharath; De Lorenzis, Laura; Kiendl, Josef; Dunn, Martin L. (Journal article; Peer reviewed, 2017)A frictionless contact formulation for spatial rods is developed within the framework of isogeometric collocation. The structural mechanics is described by the Cosserat theory of geometrically nonlinear spatial rods. The ... -
An isogeometric digital twin for Gunnerus
Witte, Gerrit (Master thesis, 2019)Isogeometric analysis (IGA) is a new approach in the world of Finite Element Analysis (FEA). The idea is to merge the Computer Aided Design (CAD) model directly into FEA. This was not possible until now due to different ... -
Controlling toughness and strength of FDM 3D-printed PLA components through the raster layup
Kiendl, Josef; Gao, Chao (Journal article; Peer reviewed, 2020)We investigate the influence of raster layup on the resulting material properties of FDM 3D-printed materials made of PLA. In particular, we investigate the resulting toughness, strength, and stiffness, with a special focus ... -
Explicit isogeometric collocation for the dynamics of three-dimensional beams undergoing finite motions
Marino, Enzo; Kiendl, Josef; De Lorenzis, Laura (Journal article; Peer reviewed, 2018)We initiate the study of three-dimensional shear-deformable geometrically exact beam dynamics through explicit isogeometric collocation methods. The formulation we propose is based on a natural combination of the chosen ... -
A framework for efficient isogeometric computations of phase-field brittle fracture in multipatch shell structures
Proserpio, Davide; Ambati, Marreddy; De Lorenzis, Laura; Kiendl, Josef (Peer reviewed; Journal article, 2020)We present a computational framework for applying the phase-field approach to brittle fracture efficiently to complex shell structures. The momentum and phase-field equations are solved in a staggered scheme using isogeometric ... -
Hierarchically refined isogeometric analysis of trimmed shells
Coradello, Luca; D’Angella, Davide; Carraturo, Massimo; Kiendl, Josef; Kollmannsberger, Stefan; Rank, Ernst; Reali, Alessandro (Peer reviewed; Journal article, 2020)This work focuses on the study of several computational challenges arising when trimmed surfaces are directly employed for the isogeometric analysis of Kirchhoff–Love shells. To cope with these issues and to resolve ... -
Isogeometric analysis with trimmed geometries applied to ship hulls
Schønfeldt-Borchgrevink, Sofie (Master thesis, 2018)This Paper aims to investigate Trimmed NURBS surfaces for Isogeometric Analysis(IGA). NURBS are Non-Rational B-spline functions which are widely used for geometric modelling in most Computer aided Design programs. This is ... -
Isogeometric collocation for implicit dynamics of three-dimensional beams undergoing finite motions
Marino, Enzo; Kiendl, Josef; De Lorenzis, Laura (Journal article; Peer reviewed, 2019)We propose a novel approach to the implicit dynamics of shear-deformable geometrically exact beams, based on the isogeometric collocation method combined with the Newmark time integration scheme extended to the rotation ... -
Isogeometric collocation for the Reissner–Mindlin shell problem
Kiendl, Josef; Marino, Enzo; De Lorenzis, Laura (Journal article; Peer reviewed, 2017)We present an isogeometric collocation formulation for the Reissner-Mindlin shell problem. After recalling the necessary basics on differential geometry and the shell governing equations, we show that the standard approach ... -
An isogeometric finite element-boundary element approach for the vibration analysis of submerged thin-walled structures
Del Toro Llorens, Alvaro; Kiendl, Josef (Peer reviewed; Journal article, 2021)In this paper, the isogeometric formulations of the finite element and boundary element methods are applied to the dynamic analysis of thin-walled structures submerged in an infinite, inviscid, and incompressible fluid ... -
Isogeometric Kirchhoff-Love shell formulation for elasto-plasticity
Ambati, Marreddy; Kiendl, Josef; De Lorenzis, Laura (Journal article; Peer reviewed, 2018)An isogeometric thin shell formulation allowing for large-strain plastic deformation is presented. A stress-based approach is adopted, which means that the constitutive equations are evaluated at different integration ... -
Isogeometric Phase-Field Methods for Modeling Fracture in Shell Structures
Proserpio, Davide (Doctoral theses at NTNU;2021:87, Doctoral thesis, 2021)The simulation of the fracture of engineering structures is a challenging topic that requires accurate and efficient numerical models. This thesis focuses on the modeling of brittle and ductile fracture in thin shell structures ... -
Isogeometric Structural Analysis of Wind Turbine Blades
Vågnes, David (Master thesis, 2018)Isogeometric analysis, IGA, seeks to bridge the gap between engineering design and computational analysis by using spline functions as finite element bases in the analysis framework. The general concept can be applied to ...