Browsing by Author "Thorvaldsen, Tom"
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Bond strength and performance of optical fibre Bragg gratings sensors embedded in composite patch repairs for military aircraft
Jones, Tyler Paul; Thorvaldsen, Tom; Sagvolden, Geir; Pran, Karianne; Olsen, Torbjørn (2016)Structural health monitoring (SHM) systems are recognized as a key element in a modern and efficient approach to structural lifecycle management. With novel applications of advanced materials, such as extensive use of ... 
COMPACT project  hydro burst testing of impact damaged fourinch pressure vessels
Thorvaldsen, Tom; Larsen, Helge Roar; Olsen, Torbjørn (20130920)Twelve fourinch pressure vessels made of carbon fibre reinforced plastic (CFRP) have been produced at FFI. The applied material system is a carbon fibre reinforced prepreg system, TCR UF332595/M30SC. The vessels have ... 
Dynamic mechanical analysis : theoretical considerations on mechanical properties
Osnes, Harald; Thorvaldsen, Tom (20110919)English summary Dynamic mechanical analysis (DMA) is a technique used to study and characterize materials. In the test method, small test specimens, or beams, are typically subjected to harmonic, threepoint bending ... 
Experiences from ultrasound testing  Olympus Omniscan MX and DolphiCam CF08/DF16
Jones, Tyler P.; Thorvaldsen, Tom (20160108)Modern military platforms, such as the NH90 helicopter and the F35 Joint Strike Fighter, consist of a large percentage of lightweight materials, such as composites. New materials require new and different techniques ... 
Improved discretisation and linearisation of active tension in strongly coupled cardiac electromechanics simulations
Sundnes, Joakim; Wall, Samuel Thomas; Osnes, Harald; Thorvaldsen, Tom; McCulloch, Andrew (2012)Mathematical models of cardiac electromechanics typically consist of three tightly coupled parts: systems of ordinary differential equations describing electrochemical reactions and crossbridge dynamics in the muscle ... 
Investigation of Theoretical Models for the Elastic Stiffness of NanoparticleModified Polymer Composites
Thorvaldsen, Tom; Johnsen, Bernt Brønmo; Olsen, Torbjørn; Hansen, Finn Knut (2015)Mathematical models are investigated and suggested for the calculation of the elastic stiffness of polymer nanocomposites. Particular emphasis is placed on the effect on the elastic stiffness from agglomerates and the ... 
A model study of the effective Young´s modulus for randomly distributed shortfiber composites
Thorvaldsen, Tom (20110125)This report provides an overview of a set of macromechanical models for the effective Young’s modulus of short fiber composites. Various models are found in the literature with varying complexity, ranging from simple rule ... 
Modelling of a thinwalled filamentwound composite cylinder using an axisymmetric approach
Thorvaldsen, Tom; Osnes, Harald (20110330)In this report, finite element analyses (FEA) are preformed for a thinwalled filamentwound composite cylinder exposed to an inner pressure load. Analyses are run for an open cylinder, as well as for a closed cylinder. ... 
Modelling the elastic stiffness of nanocomposites using interphase models
Thorvaldsen, Tom (20150615)This report describes mathematical modelling of the elastic stiffness of nanocomposites, which in this context is referred to as particles of nanosize included in a polymer matrix, i.e. particles with one dimension of ... 
Modelling the elastic stiffness of nanocomposites using the MoriTanaka method
Thorvaldsen, Tom (20150619)This report describes mathematical modelling of the elastic stiffness of nanocomposites, which in this context is referred to as particles of nanosize included in a polymer matrix, i.e. particles with one dimension of ... 
Modelling the elastic stiffness of nanocomposites using threephase models
Thorvaldsen, Tom (20150615)This report describes mathematical modelling of the elastic stiffness of nanocomposites, which in this context is referred to as particles of nanosize included in a polymer matrix, i.e. particles with one dimension of ... 
Nondestructive testing/inspection of composite materials  acoustic impact testing, TV holography and shearography
Kvalbein, Martine; Thorvaldsen, Tom (20120704)This report provides an introduction to three different nondestructive testing/inspection (NDT/NDI) methods applicable for damage detection in composite materials. A lot of techniques have been developed for metals. ... 
Numerical modeling of singlelayered piezoelectric elements
Thorvaldsen, Tom (2007)The focus of this report is on numerical simulation of piezoelectric materials. One example of such a material is quartz. By applying a pressure load to a piezoelectric material, electricity is generated – the socalled ... 
Preparation and characterisation of epoxy/alumina polymer nanocomposites
Johnsen, Bernt Brønmo; Frømyr, Tomas Roll; Thorvaldsen, Tom; Olsen, Torbjørn (2013)The effect of adding nanosized alumina fillers of both fibrelike and spherical shapes to an epoxy polymer has been investigated. The alumina was dispersed in the epoxy hardener using two different sonication techniques. ... 
Pythonbasert verktøy for analyse av resultater fra strekkmaskintester
Engebretsen, Solveig; Thorvaldsen, Tom; Sagsveen, Bendik (20121022)Denne rapporten er en brukermanual for analyse av tester utført på strekkmaskinen av typen MTS 810. Rapporten inneholder informasjon om hvordan man installerer Pythonprogramvare som er nødvendig for å kjøre analysene, ...