Blar i NTNU Open på forfatter "Gagani, Abedin"
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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 ... -
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 ... -
Environmental Effects on Fiber Reinforced Polymer Composites Fluid and Temperature Effects on Mechanical Performance
Gagani, Abedin (Doctoral theses at NTNU;2019:120, Doctoral thesis, 2019)In several applications, like offshore, marine, wind energy and aerospace industry, fiber reinforced polymer composites are exposed to mechanical loads and environmental effects: fluid exposure and high temperature. The ... -
Fluid diffusion in cracked composite laminates – Analytical, numerical and experimental study
Gagani, Abedin; Echtermeyer, Andreas T. (Journal article; Peer reviewed, 2018)Composite structural components are often subjected to service loads that cause cracks in off-axis layers, without compromising the load bearing capability of the structure. In marine or humid environments fluid ingress ... -
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 ... -
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 ... -
Long-Term Hydrolytic Degradation of the Sizing-Rich Composite Interphase
Krauklis, Andrey; Gagani, Abedin; Echtermeyer, Andreas (Journal article; Peer reviewed, 2019)Glass fiber-reinforced composites are exposed to hydrolytic degradation in subsea and offshore applications. Fiber-matrix interphase degradation was observed after the matrix was fully saturated with water and typical water ... -
Micromechanical modeling of anisotropic water diffusion in glass fiber epoxy reinforced composites
Gagani, Abedin; Fan, Yiming; Muliana, Anastasia H; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)Fluid diffusion in fiber reinforced composites is typically anisotropic. Diffusivity in the fiber direction is faster than in the transverse direction. The reason for this behavior is not yet fully understood. In this work, ... -
Multiscale Modelling of Environmental Degradation—First Steps
Echtermeyer, Andreas; Gagani, Abedin; Krauklis, Andrejs; Mazan, Tobiasz (Chapter, 2018)Fibre-reinforced plastics are praised for their good corrosion resistance. However, when this resistance needs to be documented for safety-critical applications extensive and time-consuming test programmes are needed. A ... -
Near-Infrared Spectroscopic Method for Monitoring Water Content in Epoxy Resins and Fiber-Reinforced Composites
Krauklis, Andrejs; Gagani, Abedin; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)Monitoring water content and predicting the water-induced drop in strength of fiber-reinforced composites are of great importance for the oil and gas and marine industries. Fourier transform infrared (FTIR) spectroscopic ... -
Orthotropic fluid diffusion in composite marine structures. Experimental procedure, analytical and numerical modelling of plates, rods and pipes
Gagani, Abedin; Krauklis, Andrey; Echtermeyer, Andreas (Journal article; Peer reviewed, 2018)Finite elements simulations of fluid diffusion for composite structures are becoming more common in marine and offshore applications. Input parameters for such simulations are the orthotropic diffusion constants for the ... -
Predicting multi-axial diffusion of water in laminated composite structural components
Fan, Yiming; Krauklis, Andrey, E; Gagani, Abedin; Sæter, Erik; Echtermeyer, Andreas; Muliana, Anastasia H (Journal article, 2021)This study examines the diffusion of water in fiber-reinforced polymer (FRP) laminated composites, comprising epoxy resin and unidirectional glass fibers, at different material and structural scales. Experiments on the ... -
Prediction of Orthotropic Hygroscopic Swelling of Fiber-Reinforced Composites from Isotropic Swelling of Matrix Polymer
Krauklis, Andrey; Gagani, Abedin; Echtermeyer, Andreas (Journal article; Peer reviewed, 2019)Swelling in fiber-reinforced composites is anisotropic. In this work, dealing with glass fiber epoxy composite immersed in distilled water, swelling coefficients are obtained in each direction experimentally. Swelling ... -
Time-Temperature-Plasticization Superposition Principle: Predicting Creep of a Plasticized Epoxy
Krauklis, Andrey; Akulichev, Anton; Gagani, Abedin; Echtermeyer, Andreas (Journal article; Peer reviewed, 2019)Long-term creep properties and the effect of water are important for fiber reinforced polymer (FRP) composite materials used in offshore applications. Epoxies are often used as a matrix material in such composites. A typical ... -
Zero Stress Aging of Glass and Carbon Fibers in Water and Oil—Strength Reduction Explained by Dissolution Kinetics
Echtermeyer, Andreas; Krauklis, Andrey; Gagani, Abedin; Sæter, Erik (Journal article; Peer reviewed, 2019)Understanding the strength degradation of glass and carbon fibers due to exposure to liquids over time is important for structural applications. A model has been developed for glass fibers that links the strength reduction ...