Browsing by Author "Samal, Sneha"
Now showing 1 - 5 of 5
Results Per Page
Sort Options
- ItemEffects of filler distribution on magnetorheological silicon-based composites(MDPI, 2019-01-01) Samal, Sneha; Škodová, Marcela; Blanco, IgnazioThe smart materials subclass of magnetorheological elastomer (MRE) composites is presented in this work, which aimed to investigate the influence of filler distribution on surface morphology. Iron particles with sizes ranging from 20 to 150 μm were incorporated into the elastomer matrix and a 30% volume fraction (V%) was chosen as the optimal quantity for the filler amount in the elastomer composite. The surface morphology of MRE composites was examined by 3D micro-computed tomography (μCT) and scanning electron microscopy (SEM) techniques. Isotropic and anisotropic distributions of the iron particles were estimated in the magnetorheological elastomer composites. The filler particle distribution at various heights of the MRE composites was examined. The isotropic distribution of filler particles was observed without any influence from the magnetic field during sample preparation. The anisotropic arrangement of iron fillers within the MRE composites was observed in the presence of a magnetic field during fabrication. It was shown that the linear arrangement of the iron particle chain induced magnetization within the composite. Simulation analysis was also performed to predict the particle distribution of magnetization in the MREs and make a comparison with the experimental observations.
- ItemInvestigation of the Internal Structure of Fiber Reinforced Geopolymer Composite under Mechanical Impact: A Micro Computed Tomography (mu CT) Study(MDPI, 2019-02-01) Samal, Sneha; Kolínová, Marcela; Rahier, Hubert; Dal Poggetto, Giovanni; Blanco, IgnazioThe internal structure of fiber reinforced geopolymer composite was investigated by microfocus X-ray computed tomography (mu CT) under mechanical impact. mu CT is a non-destructive, multi approach technique for assessing the internal structures of the impacted composites without compromising their integrity. The three dimensional (3D) representation was used to assess the impact damage of geopolymer composites reinforced with carbon, E-glass, and basalt fibers. The 3D representations of the damaged area with the visualization of the fiber rupture slices are presented in this article. The fiber pulls out, and rupture and matrix damage, which could clearly be observed, was studied on the impacted composites by examining slices of the damaged area from the center of the damage towards the edge of the composite. Quantitative analysis of the damaged area revealed that carbon fabric reinforced composites were much less affected by the impact than the E-glass and basalt reinforced composites. The penetration was clearly observed for the basalt based composites, confirming mu CT as a useful technique for examining the different failure mechanisms for geopolymer composites. The durability of the carbon fiber reinforced composite showed better residual strength in comparison with the E-glass fiber one.
- ItemInvestigation of the Internal Structure of Fiber Reinforced Geopolymer Composite under Mechanical Impact: A Micro Computed Tomography (µCT) Study(2019-02-02) Samal, Sneha; Kolínová, Marcela; Rahier, Hubert; Dal Poggetto, Giovanni; Blanco, IgnazioThe internal structure of fiber reinforced geopolymer composite was investigated by microfocus X-ray computed tomography (µCT) under mechanical impact. µCT is a non-destructive, multi approach technique for assessing the internal structures of the impacted composites without compromising their integrity. The three dimensional (3D) representation was used to assess the impact damage of geopolymer composites reinforced with carbon, E-glass, and basalt fibers. The 3D representations of the damaged area with the visualization of the fiber rupture slices are presented in this article. The fiber pulls out, and rupture and matrix damage, which could clearly be observed, was studied on the impacted composites by examining slices of the damaged area from the center of the damage towards the edge of the composite. Quantitative analysis of the damaged area revealed that carbon fabric reinforced composites were much less affected by the impact than the E-glass and basalt reinforced composites. The penetration was clearly observed for the basalt based composites, confirming µCT as a useful technique for examining the different failure mechanisms for geopolymer composites. The durability of the carbon fiber reinforced composite showed better residual strength in comparison with the E-glass fiber one.
- ItemMagneto-Rheological Elastomer Composites. A Review(MDPI, 2020-01-01) Samal, Sneha; Škodová, Marcela; Abate, Lorenzo; Blanco, IgnazioMagneto-rheological elastomer (MRE) composites belong to the category of smart materials whose mechanical properties can be governed by an external magnetic field. This behavior makes MRE composites largely used in the areas of vibration dampers and absorbers in mechanical systems. MRE composites are conventionally constituted by an elastomeric matrix with embedded filler particles. The aim of this review is to present the most outstanding advances on the rheological performances of MRE composites. Their distribution, arrangement, wettability within an elastomer matrix, and their contribution towards the performance of mechanical response when subjected to a magnetic field are evaluated. Particular attention is devoted to the understanding of their internal micro-structures, filler–filler adhesion, filler–matrix adhesion, and viscoelastic behavior of the MRE composite under static (valve), compressive (squeeze), and dynamic (shear) mode.
- ItemMagnetorheological Elastomer Composites: The Influence of Iron Particle Distribution on the Surface Morphology(Wiley-VCH Verlag, 2020-02-01) Samal, Sneha; Blanco, Ignazio; Kolínová, Marcela; Dal Poggetto, Giovanni; Catauro, MichelinaIron particles ranging from 50 to 150 µm are incorporated in an elastomer matrix to obtain magnetorheological elastomer (MRE) composites, aiming to investigate their effects on the surface morphology. The isotropic and anisotropic distribution of fillers are estimated in MRE composites. A simulation analysis is carried out to predict the particle distribution in MRE composites, and a correlation between the experimental observation and simulation analysis is established. The volume fraction of 30 vol% is chosen as the optimal quantity for the filler amount in elastomer composite.