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Go to Editorial ManagerIn this study, glass-filled epoxy functionally graded material (FGM) was prepared by adopting the hand lay-up method. The vertical gravity casting was used to produce a continuous variation in elastic properties. A 30 % volume fraction of glass ingredients that have mean diameter 90 µm was spread in epoxy resin ( ρ = 1050 kg/m 3 ). The mechanical properties of FGM were evaluated according to ASTM D638. Experimental results showed that a gradually relationship between Young’s modulus and volume fraction of glass particles, where the value of Young’s modulus at high concentration of glass particles was greater than that at low concentration, while the value of Poisson’s ratio at high concentration of glass particles was lower than that at low concentration. The manufacture of this FG beam is particularly important and useful in order to benefit from it in the field of various fracture tests under dynamic or cyclic loads.
This study aims to evaluate the effect of adding alumina particles at specific ratios on the thermal properties of the epoxy-alumina composite. The hand lay-up technique was employed using a gravity molding process. Six samples’ specimens with dimensions specified by the International Standard (ASTM) were prepared with the specified volume ratios of alumina (0%, 10%, 20%, 40%, 50%, and 60%). X-Ray Diffraction (XRD) was conducted, and according to the Lee's principle the thermal conductivity was measured. The results showed that increasing the concentration of the alumina filler significantly enhances the thermal conductivity of the composite, reaching approximately 1.25 W/m.K at a loading of 60%. Moreover, the differential scanning calorimetry (DSC) analysis of the DSC conducted on samples containing (0%, 40%, and 60% AI2O3) only shows that the glass transition temperature (Tg) gradually increases with the increase in alumina content, reaching 138.92°C at 60% AI2O3. These results confirm the suitability of the developed composite for efficient thermal management in advanced engineering applications.
This research studied the critical load of composite columns theoretical and numerical by using ANSYS14 package depended on experimental tensile properties of composite specimens. The composite specimens were prepared by hand lay-up technique made from unsaturated polyester reinforced with glass fibers with different fiber volume fraction V f , aspect ratio (L/T), and angle of fibers for coarse and fine woven fibers. The critical load that obtained by using program (ANSYS 14) have also shown a good agreement with results that were obtained theoretically and the maximum difference was (0.7%). The results show that the maximum value of the critical load can be observed at V f =11%, L/T = (3.5) and θ = (0 º /90 º ) for fine woven fibers was (622.115N). Also its found the maximum critical load for coarse woven fibers can be observed at V f %=8%, L/T=(3.5) and θ = (0 º /90 º ) was (486.887N). Also the observed values of tensile properties and predicated values are scattered close to the (45 ˚ ) line.