Browsing Publikasjoner fra CRIStin - NTNU by Author "Echtermeyer, Andreas"
Now showing items 1-20 of 38
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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. ... -
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 ... -
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. ... -
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 ... -
The effects of the van der Waals potential energy on the Young’s modulus of a polymer: comparison between molecular dynamics simulation and experiment
Sahputra, Iwan Halim; Echtermeyer, Andreas (Journal article, 2021)Molecular dynamics simulation were employed to investigate the effect of changing the potential energies describing primary and secondary bonds on the Young’s modulus of a polymer. The energies were changed by arbitrarily ... -
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 ... -
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 THE STRAIN FIELD IN A COMPOSITE – METAL ADHESIVE JOINT WITH AN OPTICAL BACKSCATTER REFLECTOMETER
Grave, Jon Harald Lambert; Håheim, Magnus Lund; Echtermeyer, Andreas (Chapter; Peer reviewed, 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 ... -
Experimental verification of the elastic response in a numeric model of a composite propeller blade with bend twist deformation
Rokvam, Sondre Østli; Vedvik, Nils Petter; Mark, Lukas; Rømcke, Eivind; Ølnes, Jon; Savio, Luca; Echtermeyer, Andreas (Journal article; Peer reviewed, 2021) -
Filament wound composite fatigue mechanisms investigated with full field DIC strain monitoring
Hugaas, Eivind; Echtermeyer, Andreas (Peer reviewed; Journal article, 2021)Fatigue of filament wound materials was investigated using Digital Image Correlation DIC monitoring every 50th cycle of a high cycle fatigue test of a split disk ring sample. The ring was cut from a filament wound glass ... -
HNBR elastomer composite with zero thermal contraction over a range of temperatures
Akulichev, Anton; Alcock, Benjamin; Protasov, Andrey; markin, pavel; Echtermeyer, Andreas (Journal article; Peer reviewed, 2019)Elastomers such as hydrogenated nitrile butadiene rubber (HNBR) are known to have inferior dimensional stability upon temperature changes compared to metallic materials. This can result in thermal contraction mismatches ... -
Hygrothermal Aging of Amine Epoxy: Reversible Static and Fatigue Properties
Krauklis, Andrey; Gagani, Abedin; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)Fiber-reinforced polymers (FRP) are widely used in structural applications. Long-term properties of such materials exposed to water are of high concern and interest, especially for subsea and offshore applications. The ... -
Immersed interlaminar fatigue of glass fiber epoxy composites using the I-beam method
Gagani, Abedin; Mialon, Emeric; Echtermeyer, Andreas (Journal article; Peer reviewed, 2019)Exposure to marine environment causes a degradation of the interlaminar shear performance of composites. This effect has been reported in several studies, but the mechanisms that lead to failure in composites subjected to ... -
In-Situ Strain Measurements in Large Volumes of Hardening Epoxy Using Optical Backscatter Reflectometry
Heinze, Søren; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)Some large engineering structures are made by casting polymers into a mold. The structures can have complicated geometries and may be filled with other components, such as electrical transformers. This study investigated ... -
Influence of Compounding Parameters on the Tensile Properties and Fibre Dispersion of Injection-Moulded Polylactic Acid and Thermomechanical Pulp Fibre Biocomposites
Zarna, Chiara; Rodriguez-Fabia, Sandra; Echtermeyer, Andreas; Chinga-Carrasco, Gary (Peer reviewed; Journal article, 2022)Thermomechanical pulp (TMP) fibres can serve as renewable, cost-efficient and lightweight reinforcement for thermoplastic polymers such as poly(lactic acid) (PLA). The reinforcing ability of TMP fibres can be reduced due ... -
Influence of delaminations on fluid diffusion in multidirectional composite laminates – Theory and experiments
Gagani, Abedin; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)Multidirectional composite laminates are often used in marine and offshore applications. Upon cyclic loading, cracks appear early in the off-axis plies and generate delaminations, which accelerate fluid diffusion. In this ...