Increased material demand in all sectors is primarily due to exponential growth in population to fulfill human needs and comforts. Recycling of collected aluminium beverage cans and Al 6061 alloy scraps from industries ensures energy savings with reduced environmental problems in fabricating composite parts economically. The iron oxide (α-Fe2O3) nanoparticles were prepared by precipitation method using ferric chloride and ammonia as a precursor. The prepared nanoparticles were characterized by using Transmission Electron Microscope (TEM), X-Ray Diffraction (XRD) and Fourier Transform Infrared (FTIR). Stir cast processing route ensures uniform mix of reinforcement nanoparticles in matrix material. The prepared nanocomposites (matrix: Al Scrap (90% Scrap Al 6061 alloy + 10% Waste Al can); reinforcement: 2%, 4% and 6% wt. of Al matrix) were mechanically characterized for hardness and tensile strengths. It was observed that, increased percent of Fe2O3 nanoparticles in the metal matrix nanocomposite (MMCs) resulted in significant increase in hardness and tensile strength values. Fractography analysis examined viz. scanning electron microscope (SEM) revealed a ductile failure for as-cast Al scrap followed by brittle failure in Al MMC's.
Fiber reinforced composite materials have been gaining wide application in aircraft submarine and spacecraft constructions, to strengthen bridges and other civil engineering structures. Joints are formed using mechanical fasteners and load sharing in these joints depends on the number, size, and material of the bolts and the stiffness of the joining members. Therefore, suitable revealing methods for the failure strength would help in selecting the appropriate joint size in a given application.
The objective of the present work is to determine the bearing or failure load of filler added woven glass fiber/epoxy composites through single and double serial pinned joints with different parameters by experimental methods. The effect of the distance from free edge to the diameter of first hole (E/D) ratio, the width of plate to diameter of hole (W/D) ratio and the effect of filler materials on Titanium dioxide (TiO2) and Zinc Sulphide (ZnS) on bearing load are experimentally investigated using laminated woven glass fiber composite plate with single and double serial pinned joints.
In this work, a statistical model was developed using Taguchi technique to study the factors influencing the tensile strength of single edge notched jute hybrid composites. Standard uniaxial tensile tests were conducted to evaluate tensile strength of single edge notched jute hybrid composite specimens, with different fiber orientations, glass volume fractions and notch sizes, in accordance with ASTM D3039 standards. It is observed that as glass volume fraction increases, tensile strength increases. As notch size increases, tensile strength decreases. The tensile strengths of specimens in fiber direction (0°/90°) were higher than those in off fiber direction (±45°). The forecast model indicates that the major parameters that impact the tensile strength were glass volume fraction and fiber orientation. Notch size had lesser impact on tensile strength. The optimum value of the tensile strength is observed for specimen with 0/90 fiber orientation, 45% glass volume fraction, 2mm notch size and from the confirmation test, the model results were observed to be near to the experimental values.
Naturally accessible materials have recently become appealing to researchers and scientists due to their suitability as an ideal reinforcement for polymer composites reinforced with fiber. Low cost, relatively strong mechanical properties, qualities of non-abrasive and bio-degradability, exploited as a switch to the standard fiber. This research investigates the effect of areca fiber reinforcement of fracture load and fracture toughness. Epoxy resin used as a matrix material. Type I fracture hardness checks are conducted in a universal servo hydraulic control system. The findings revealed a significant improvement in fracture load values and durability of fracture with improved fibre content.
In this work, two reinforcements (natural jute fiber and glass fiber) hybridized with different volume fractions, are reinforced with a constant volume epoxy resin through hand layup method. The ASTM standard tensile specimen of jute natural epoxy composite of different volume fractions and orientations of fibers, with varied single edge notch (SEN) size were subjected to uniaxial tensile load in universal testing machine. Effect of jute volume fraction, notch size and fiber orientation on tensile strength and fracture toughness has been studied through experimental results. Increased percent of jute fibre showed decrease in tensile strength and fracture toughness. Also, with the increase in notch size, the tensile strength decreased and the fracture toughness increased. Further, the tensile strength and fracture toughness were superior in 0°/90° fiber orientation specimen than those with ±45° fiber orientation. Furthermore, experimental results were validated by conducting statistical and fractographic analysis. The jute fiber percentage was ranked as best level factor affecting the fracture behavior as per taguchi method. Morphological features of fractured surfaces were analyzed through scanning electron microscopic (SEM) images with respect to nature of jute fiber failure under uniaxial loading conditions.
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