Publications

Recently, the demands of composite materials used in various engineering applications are growing higher because of their outstanding mechanical and thermal properties. This study represents an experimental investigation to determine mechanical properties of Al-based composites materials using Cu and SiC as reinforcement. Al-30-wt%-Cu, Al-40-wt%-Cu, Al-30-wt%-SiC, and Al-40-wt%-SiC composite bars were fabricated using stir casting process to ensure uniform distribution of reinforced elements. The composite bars were prepared into required shape to conduct test for evaluating mechanical properties. Al-40-wt%-Cu shows improved properties such as, hardness, strength, and impact energy absorption than Al-30-wt%-Cu due to more presence of Cu content. Al-30-wt%-Cuand Al-40-wt%-Cu bars showed improved mechanical properties than both Al-30-wt%-SiC and Al-40-wt%-SiC. It is also seen that Al-30-wt%-Cu and Al-40-wt%-Cu showed high hardness, yield strength, and impact energy absorption compared to Al-30-wt%-SiC and Al-40-wt%-Cu respectively. On the other hand, Al-30-wt%-Cu is 3.5% lightweight than Al-30-wt%-SiC and Al-40-wt%-Cu is 2.11% lightweight than Al-40-wt%-SiC. Al-30-wt%-Cu and Al-40-wt%-Cu showed improved specific hardness, specific yield strength, and specific impact energy absorption compared to Al-30-wt%-SiC and Al-40-wt%-Cu respectively. In addition, Al-40-wt%-Cu showed better mechanical properties among the bars.

full article link: https://doi.org/10.38032/jea.2020.04.006

Metal composites (MCs) are drawn considerable attention for improvement of mechanical properties like high specific strength, specific modulus, damping capacity and wear resistance etc. of materials. This study represents the fabrication of Al-20-wt%-Cu and Al-30-wt%-Cu composite bar by stir casting process. Stir casting technology is found to be most economical, simple, and flexible among varieties of manufacturing process available for metal composites along with that it is used for large quantity of production of metal composites which is discussed in this paper. It is noted that hardness, density, impact energy absorption, tensile strength are tested for Al-20-wt%-Cu and Al-30-wt%-Cu composite bar where 4.84% lower density, 10.74% lower strength, 17.84% lower strain are obtained for Al-20-wt%-Cu composite compared with Al-30-wt%-Cu composite. Moreover, absorbed energy for Al-20-wt%-Cu composites is obtained as E=0.73j whereas E=0.93j for Al-30-wt%-Cu composites which is 27.4% higher compared with Al-20-wt%-Cu composites. It is worthy to mention that better tensile strength, hardness properties of Al-30-wt%-Cu composite cause greater energy absorption capability due to presence of enhanced copper content. At present times, composites are being used in automotive, aerospace, electric equipment, sports goods, furniture, medical equipment, packaging elements and modern machinery for its high stiffness, strength, low mass, low weight and low manufacturing cost. This paper represents comparative study of mechanical properties between Al-20-wt%-Cu and Al-30-wt%-Cu composite bar fabricated by stir casting process.

full paper link: https://www.dropbox.com/s/m0vcucvjyud33r8/ICMERE-2019%2C%20PI%20197.pdf?dl=0

Syntactic metal foams are pulling in extensive consideration lately because of their potential for weight sparing in bundling, guards, and vehicle structures. These foams are incorporated by scattering empty particles in lattice material. Syntactic foams possess adequately high mechanical properties for use as basic materials and additionally automotive as well as energy storage materials. Powder metallurgy and dealloying process are utilized for delivering iron metal foam. Hence, the porosity of foam which is found to be shifted between 6.75% to 52.6% and the density is varied from 0.91 g/cc to 2.90 g/cc. Three types of samples are prepared varying weight percentage of pure iron metal powder and aluminum as space holder. Sample of weight percentage 30:70, 70:30 and 50:50 ratios show quite similar results in terms of porosity and density ratio. It is noted that density increases with the decrement of porosity. This is not fluctuating randomly. In addition, density of sample 30:70 is much less than samples of 70:30 and 50:50.The syntactic iron foam produced in this process is observed to be a viable procedure for permeable material manufacture. This iron metal foam can be utilized as useful and auxiliary material for making inserts as this structure gives bringing down youthful modulus and gives better cell connection. This paper represents production and analysis of iron metal foam by dealloying process.

full paper link: https://www.dropbox.com/s/m0vcucvjyud33r8/ICMERE-2019%2C%20PI%20197.pdf?dl=0

The importance of renewable energy is beyond description as amount of natural resources of energy is decreasing drastically. Hence, it is a timely challenging issue to increase power sources that will meet the demand of power in near future. However, increasing source of power is not a simple task. Moreover, what we can do is to utilize the sources of renewable energy more efficiently and effectively. It is worthy to mention that solar energy is one of the most important sources of renewable energy. This paper focuses on the performance test of a photovoltaic cell submerged in glycerin, water and vinegar to make a comparative study of the results found from photovoltaic cell which is normally exposed to air. This is done as extra undesirable heat is expelled from both front and back surfaces of the cell by directly submerging in different chemicals such as glycerin, water, and vinegar. The immediate contact heat transfer and relatively bigger heat dispersal surface area might gain a satisfactorily low cell temperature which results in greater solar conversion efficiencies. It is noted that higher temperature getting from continuous exposal to air on the cell decrease energy conversion efficiency. Hence, research is carried out to increase performance of photovoltaic cell under several liquids and compare the efficiency with air. In this paper, four photovoltaic cells which are made of having dimension about 60 mm × 60 mm are used for performance test. Three of the cells are submerged in three different liquids (water, vinegar and glycerin) and other one is exposed in air The experimental investigation is performed in CUET student residential area for five days to take data. It is noted that performance of solar cell submerged in water is satisfactory than vinegar, glycerin, and air.

full paper link: https://www.dropbox.com/s/yad2z7pf2s4utae/ICMERE%202019%2C%20PI-210.pdf?dl=0