Browsing NTNU Open by Author "Echtermeyer, Andreas"
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3D Printable Filaments Made of Biobased Polyethylene Biocomposites
Filgueira, Daniel; Holmen, Solveig; Melbø, Johnny K; Moldes, Diego; Echtermeyer, Andreas; Chinga-Carrasco, Gary (Journal article; Peer reviewed, 2018)Two different series of biobased polyethylene (BioPE) were used for the manufacturing of biocomposites, complemented with thermomechanical pulp (TMP) fibers. The intrinsic hydrophilic character of the TMP fibers was ... -
A Practical Approach for Data Gathering for Polymer Cure Simulations
Heinze, Søren; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)Producing precision parts requires good control of the production parameters. When casting thermoset polymers an understanding of the curing process, with its heat release and associated temperature changes, is important. ... -
A Running Reference Analysis Method to Greatly Improve Optical Backscatter Reflectometry Strain Data from the Inside of Hardening and Shrinking Materials
Heinze, Søren; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)Due to the increasing ease of use and the superiority of the results, distributed strain measurements, utilizing Optical Backscatter Reflectometry (OBR), have become more important and widespread over the last few years. ... -
Adhesion, Friction and Leakage in Contacts with Elastomers
Tiwari, Avinash (Doctoral theses at NTNU;2018:277, Doctoral thesis, 2018)Adhesion, friction and leakage in contacts with elastomers is central to many technologically demanding applications such as tires, seals, wiper blades and syringes to just name a few. These tribological systems are very ... -
Anisotropic fluid diffusion in carbon fiber reinforced composite rods: Experimental, analytical and numerical study
Gagani, Abedin; Krauklis, Andrejs; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)Carbon fiber composite plastic (CFRP) rods immersed in water present a pronounced anisotropic diffusion behavior. Understanding and predicting this behavior is important as the mechanical properties of the material are ... -
Buckling due to external pressure of a composite tube measured by Rayleigh optical backscatter reflectometry and analyzed by finite elements
Hugaas, Eivind; Vedvik, Nils Petter; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)There is a growing interest in replacing steel tubes that operate in high pressure and high temperature environments with composite tubes. Such applications can include drilling risers and drill strings for the offshore ... -
Change of strain field due to damage development in adhesive joints
Midtbø, Carl-Magnus (Master thesis, 2013)In this thesis six metal I-beams with a crack repaired by a composite patch been tested in four point bending. The patches used to repair the beams had three different patch thicknesses. The different thicknesses were ... -
Closed Mould Net Shape Processing of Prepregs with Resin Injection
Johnsen, Simen (Master thesis, 2013)High performance composite parts require strict tolerances in all directions before the parts are ready to be used. Numerous of machining and assembly operations are often required to obtain the desired geometry and ... -
Compression stress relaxation in carbon black reinforced HNBR at low temperatures
Akulichev, Anton; Alcock, Benjamin; Echtermeyer, Andreas (Journal article; Peer reviewed, 2017)Findings of a study of stress relaxation behaviour of hydrogenated nitrile butadiene rubber (HNBR) at nominal compressive strains up to 0.4 and temperatures above and below the glass transition temperature Tg are reported. ... -
Cure Modeling of Large Casted Thermoset Polymer Parts
Heinze, Søren (Doctoral theses at NTNU;2018:407, Doctoral thesis, 2018) -
Development of Pressure Vessel Using Steel Fiber
Juell, Thomas (Master thesis, 2019)Denne oppgaven har undersøkt muligheten for bruk av ende-trukket rustfritt stålfiber med diameter på 8 $\mu$m for å produsere fiberforsterket polymerkompositt produsert gjennom filamentviklingsmetode. Hovedformålet med ... -
Digital Twin for composite materials
Ekerhovd, Peder Lange (Master thesis, 2020)En Digital Tvilling (Digital Twin) ble utviklet for å kalkulere skade fra kryp og utmatting på grunn av en-akset belastning i plastkomponenter. Den Digitale Tvillingen gjorde en kvantitativ analyse av skaden som oppstår ... -
Dissolution kinetics of R-glass fibres: Influence of water acidity, temperature, and stress corrosion
Krauklis, Andrey; Gagani, Abedin; Vegere, Kristine; Kalnina, Ilze; Klavins, Maris; Echtermeyer, Andreas (Journal article; Peer reviewed, 2019)Glass fibres slowly degrade due to dissolution when exposed to water. Such environmental aging results in the deterioration of the mechanical properties. In structural offshore and marine applications, as well as in the ... -
Dissolving Cylinder Zero-Order Kinetic Model for Predicting Hygrothermal Aging of Glass Fiber Bundles and Fiber-Reinforced Composites
Krauklis, Andrey; Echtermeyer, Andreas (Chapter, 2018)Glass fibers and fiber-reinforced composites degrade when exposed to water. Understanding the dissolution behaviour of glass in fiber-reinforced composites is necessary to predict the changes in physical and mechanical ... -
Elastomer viscoelasticity and performance of seals in coldclimate applications
Akulichev, Anton (Doctoral theses at NTNU;2017:295, Doctoral thesis, 2017)The Ph.D. thesis addresses the issues of elastomer seals operating in cold climate areas like Arctic. The work is devoted to a better understanding of low-temperature behaviour of elastomer seals near the glass transition ... -
Embedded optical fibres for monitoring pressurization and impact of filament wound cylinders
Sæter, Erik; Lasn, Kaspar; Echtermeyer, Andreas; Nony, Fabien (Journal article, 2018)Filament wound composite pressure vessels have found use throughout many industries for storing high-pressure gases. The ability to investigate the vessels for possible damage from accidental impact loads is important for ... -
Environmental Aging of Constituent Materials in Fiber-Reinforced Polymer Composites
Krauklis, Andrejs (Doctoral theses at NTNU;2019:215, Doctoral thesis, 2019)Fiber-reinforced polymer (FRP) composites have seen a rapid rise in use in the past 50 years due to their high strength, stiffness, relatively light weight and relatively high corrosion resistance, especially when compared ... -
Estimating SN curves for local fiber dominated fatigue failure in ring specimens representing filament wound pressure vessels with damage
Hugaas, Eivind; Echtermeyer, Andreas (Peer reviewed; Journal article, 2021)Modeling the effect of fatigue is important for predicting remaining life of damaged filament wound composite pressure vessels. This study shows how S-N curves can be measured that describe local fiber dominated fatigue ... -
Evaluation of Antifreeze Coatings to prevent icing on Arctic Offshore Structures
Toreskås, Oda Lunde (Master thesis, 2013)Icing of operating structures in the Arctic areas causes difficulties for ships and offshore drilling units. The large amount of accreted ice on these structures can make the ship turn over, and makes the work both challenging ... -
EVALUATION OF THE STRAIN FIELD IN A COMPOSITE – METAL ADHESIVE JOINT WITH AN OPTICAL BACKSCATTER REFLECTOMETER
Grave, Jon Harald Lambert; Håheim, Magnus Lund; Echtermeyer, Andreas (Conference object, 2012)Knowing the strains and stresses in an adhesive joint is critical for the understanding and proper modeling of adhesive joints. To find a good method for measuring this has been a part of the work done by FP7 Co-Patch ...