Browsing Institutt for konstruksjonsteknikk by Title
Now showing items 8-27 of 2612
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A combined isotropic, kinematic and distortional hardening model for aluminum and steels under complex strain-path changes
(Journal article; Peer reviewed, 2018)In this work, a new model is proposed for predicting stress transients caused by strain path changes. The model is formulated in stress space, where a second order tensor, i.e., the microstructure stress deviator, is used ... -
A Combined Precipitation, Yield Stress, and Work Hardening Model for Al-Mg-Si Alloys Incorporating the Effects of Strain Rate and Temperature
(Journal article; Peer reviewed, 2018)In this study, a combined precipitation, yield strength, and work hardening model for Al-Mg-Si alloys known as NaMo has been further developed to include the effects of strain rate and temperature on the resulting stress–strain ... -
A Comparative Study Between the Finite Element Analysis and the Isogeometric Analysis Within a Parametric Environment.
(Master thesis, 2022)Vanlig praksis for en design prosess i dag, er at arkitekter og ingeniører jobber i ulik programvare. Det er derimot fordelaktig med et tett samarbeid, for å kunne skape visuelt pene og strukturelt smarte design. I et ... -
A Comparative Study Between the Finite Element Analysis and the Isogeometric Analysis Within a Parametric Environment.
(Master thesis, 2022)Vanlig praksis for en design prosess i dag, er at arkitekter og ingeniører jobber i ulik programvare. Det er derimot fordelaktig med et tett samarbeid, for å kunne skape visuelt pene og strukturelt smarte design. I et ... -
A comparative study of beam element formulations for nonlinear analysis: corotatinal vs. geometrically exact formulations
(Chapter, 2017)In this work the geometrically exact three-dimensional beam theory has been used as basis for development of a family of isoparametric higher order large deformation curved beam elements. Geometrically exact three-dimensional ... -
A density-dependent failure criterion for concrete
(Journal article, 2016)This work focuses on the large effect of small secondary stresses on the compressive strength of concrete. The strength and especially the ductility of structural concrete members depend on local triaxial stress conditions ... -
A dynamic analysis of Skuteviksboder in Bergen and alternative load-bearingsystems
(Master thesis, 2010)A seismic analysis of Skuteviksboder is carried out by a simplified hand calculation in addition to a computation by the analytical program FEM-design. Alternative load-bearingsystems are discussed as well. The theory that ... -
A family of hyperelastic models for human brain tissue
(Journal article; Peer reviewed, 2017)Experiments on brain samples under multiaxial loading have shown that human brain tissue is both extremely soft when compared to other biological tissues and characterized by a peculiar elastic response under combined shear ... -
A framework for estimating the implicit safety level of existing design codes
(Chapter, 2017)Target safety levels ( t ) are key elements for reliability-based design and calibration of design codes. They are derived by monetary optimization or from existing codes. The current article discusses these two approaches ... -
A general framework for design of rooftop extensions, exemplified for Trondheim and Oslo
(Master thesis, 2024)Den økende etterspørselen etter boliger i urbane områder, kombinert med begrenset areal, har økt boligprisene betydelig i byer som Oslo og Trondheim. Påbygg i høyden er én bærekraftig løsning på byfortetting, som unngår ... -
A gradient-based multiaxial criterion for fatigue crack initiation prediction in components with surface roughness
(Journal article, 2018)The current study presents methods to predict the governing crack initiation site and fatigue crack initiation life of components with surface roughness. The surface topography is measured with white light interferometry ... -
A Knowledge-Based Engineering-approach to globalanalysis models
(Master thesis, 2009) -
A Lode-dependent Gurson model motivated by unit cell analyses
(Journal article; Peer reviewed, 2017)In this study, the effects of including a dependency on the third deviatoric stress invariant in the void evolution equation of the Gurson model are examined using unit cell calculations and imperfection band analyses. ... -
A method for determining material's equivalent stress-strain curve with any axisymmetric notched tensile specimens without Bridgman correction
(Journal article, 2017)Large deformation analyses of problems such as plastic forming, ductile fracture with finite element method need a full range of material's equivalent stress-strain curve or flow stress-strain curve. The equivalent ... -
A microstructure-based yield stress and work-hardening model for textured 6xxx aluminium alloys
(Journal article; Peer reviewed, 2016)The plastic properties of an aluminium alloy are defined by its microstructure. The most important factors are the presence of alloying elements in the form of solid solution and precipitates of various sizes, and the ... -
A Minimal Haemodynamic System Model for Varying Exercise Intensity
(Master thesis, 2021)En matematisk modell av kardiovaskulær respons til trening under steady state presenteres, med sikte på å lage en tilpassbar, enkel, beregningsmessig billig modell som gir resultater i samsvar med eksperimentelle data. ... -
A Multi-Scale Approach for Modelling of Fracture in Aluminium Alloys under Impact Loading
(Master thesis, 2015)The main objective of this thesis was to investigate the ballistic properties of an isotropic AlMgSi aluminium alloy both experimentally and numerically. Uncoupled and coupled fracture models were calibrated using ... -
A nano-scale material model applied in finite element analysis of aluminium plates under impact loading
(Journal article, 2013)Finite element simulations of AA6070 aluminium plates struck by ogival-nose projectiles are performed. The aluminium plates are 20 mm thick and heat treated to temper O, T4, T6 and T7. A nano-scale material model, consisting ... -
A New Method for Measuring the Ice Adhesion Strength of Anti-Icing Coatings
(Master thesis, 2014)This work provides a new method for measuring the ice adhesion strength of anti-icing coatings. An extensive literature review was performed to investigate the different means by which other researchers have performed ice ... -
A new method to estimate the residual stresses in additive manufacturing characterized by point heat source
(Journal article; Peer reviewed, 2019)Residual stress in additive manufacturing (AM) is one of the key challenges in terms of structural integrity and finish quality of printed components. Estimating the residual stress distribution on additively manufactured ...