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1

Thermal gravimetric analysis of glass fiber reinforced composite for understanding the impact of copper oxide in relation to titanium oxide filler particles

Alam Shahinoor, Chowdhury Mohammad Asaduzzaman

Composites Theory and Practice

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2021

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R. 21, nr 1-2

12--21

EN

In this work, the composite samples required to investigate their thermal properties were fabricated employing the conventional hand lay-up technique, followed by a light compression molding process. A fixed weight of plain woven glass fiber and epoxy with four different types of fillers as calcium carbonate (CaCO3), aluminum oxide (Al2O3), magnesium oxide (MgO) and titanium oxide (TiO2) or copper oxide (CuO) of different weights (5, 10 and 15 g) were studied. According to thermal gravimetric analysis (TGA), it was observed that the melting point (Tm) and glass-transition temperature (Tg) are affected by the presence of CuO and TiO2, which indicate the degree of composite crystallinity established by the stronger interfacial interaction by the CuO than that of the TiO2 particles and the amorphous region of the chain. These studies were supported by examination of the surface morphology of the composites by means of scanning electron microscopy (SEM).

2

Analysis of randomly distributed particles and matrix interfaces of epoxy-based multilayered composites

Alam Shahinoor, Chowdhury Mohammad Asaduzzaman

Composites Theory and Practice

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2021

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R. 21, nr 3

70--86

EN

In this study, the surface morphology of composites, the effect of the particle geometry like the size and shape of the filler materials, their dispersion efficiency and interfaces are analyzed by morphological characterization. According to the tensile tests, it was found that the composites fabricated with CuO exhibit increasing trends of tensile strength in all the experiments compared to that of the composites with TiO2, which is verified by the degree of composite crystallinity determined by the strong interfacial interaction as well as the size, shape and compactness of the filler particles as observed by SEM micrograph analysis using Mountains software. Evaluation of this analysis shows similar amplitude variations in all the PSD curves of the composites and indicate a fatigue-like behavior. The stable isotropic properties in the composite samples with CuO result in a better surface finish, which was also well defined in the analysis of its surface texture and density function. Due to all these positive correlations, a significant rising trend in tensile strength (55.50, 105.53 and 20.40%) was found in every composite modified with CuO in comparison to TiO2. The highest tensile strength of the fabricated composite incorporating the CuO functional filler was found to be 105.530%. Such composites with TiO2 and CuO having a tensile strength of 117.9 and 141.95 N/mm2 respectively, may be used for the interior design of aircraft, watercraft, offices, residences, car and sports accessories and others.

3

Micromechanical analysis of glass fiber reinforced epoxy composites and case study of macro-mechanical observation

Alam Shahinoor, Chowdhury Mohammad Asaduzzaman

Composites Theory and Practice

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2020

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R. 20, nr 1

23--34

EN

This paper was written and formulated based on the micromechanical analysis of unidirectional glass fiber reinforced epoxy composite lamina. To simplify the calculations and achieve acceptable results, a few assumptions like idealized packing,the representative volume element (RVE), uniform strain boundary condition, statistically homogeneous unidirectional fiber reinforced composites, etc. are taken into consideration. Translational symmetric transformation was applied and established mathematical models are presented to obtain the values of the effective material properties by means of the simple strength of materials approach so that they can be compared with the semi-empirical model. In addition, a parametric study was carried out to verify the dependency of the fiber and matrix on the overall effective material properties. This will ultimately helpto develop the required glass fiber reinforced epoxy composites for their specific applications.