International Journal of Engineering Research and Advanced Technology
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A Review on the Response of Equal Channel Angular Pressed Composite
No full textSPD(Severe Plastic Deformation) methods are used to convert coarse grain metals and alloys into ultrafine grained (UFG) materials. Obtained UFG materials then possess improved mechanical and physical properties which destine them for a wide commercial use. This paper, in one direction, looks into historical development of ECAP(Equal Channel Angular Pressing) method of SPD process and its effect at obtaining fine crystalline structure and on the other side also partially focuses on further development of UFG structure by any secondary operation like Rolling
Dry Sliding Wear Behavior of Al 2219/Al2O3-MoS2 Metal Matrix Hybrid Composites Produced by Stir Casting Route
No full textIn this paper, it is aimed to present the experimental results of the studies conducted regarding microstructure, density, hardness, dry sliding wear test of Al2219 and hybrid metal matrix composites prepared by stir casting technique. The distribution of Al2O3 and MoS2 resulted in improving the hardness and density of the composite.The microphotographs of the composites studies revealed that, randomly and uniform distribution of the particles in the matrix alloy. The dry sliding wear test is carried out for different sliding speeds, sliding distances and different loads conditions using pin on disc apparatus. It is found that the addition of Al2O3 and MoS2 reinforcement increases the wear resistance of the composite. The wear rate decreases with the increase in the percentage by weight of Al2O3 and MoS2. As the sliding speed increases the wear rate decreases initially and then increases. The wear rate increases with increase in load and sliding distance
Influence of Skew Angle on Static Behaviour of Rcc and PSC Slab Bridge Decks
No full textThe effect of a skew angle on single-span reinforced concrete bridges and PSC bridges are analyzed using the finite-element method and the results are presented in this paper. Investigations are carried out on RC slab bridge decks and PSC bridge decks to study the influence of aspect ratio, skew angle and type of load. The finite-element analysis results for skewed bridges are compared to the reference straight bridges for dead load, IRC Class A loading. Also comparative analysis of response of skewed RCC and PSC slab bridge decks with that of equivalent right bridge deck is made. A total of 120 bridge models are analyzed. The variation of maximum longitudinal bending moment, maximum transverse moment, maximum torsional moment and maximum longitudinal stresses with skew angle is studied for all 120 bridge deck models. The FEA results of Dead load and Live load longitudinal bending moments decreases with increase in skew angle, where as maximum transverse moment increase with increase in skew angle and also maximum torsional moment increases with increase in skew angle and the maximum longitudinal stresses decrease with skew angle up to 30 degrees and there after increases. The benefit of pre-stressing is reflected in significant decrease in longitudinal bending moment and transverse moment and longitudinal stresses
Optimization of Advanced Space Propulsion Technique: Solar Sail
No full textNumerous space missions have been launched since the last lunar mission, including several deep space probes that have been sent to the edges of our solar system. However their journeys have been limited by the power of chemical rocket engines and the amount of rocket fuel that a spacecraft can carry. International space agencies are proposing many methods of transportation that would allow us to go farther, but a manned space mission has yet to go beyond the moon. The most realistic of these space transportation options calls for the replacement of conventional chemical fuels with an inexhaustible natural resource: sunlight. Using the Sun’s energy as a way to travel through space could give spacecraft more mobility and versatility during flight—thus opening up new regions of the Solar System for exploration and science. A Solar Sail is a spacecraft propelled by sunlight. Solar sails work by capturing the energy from light particles as they bounce off a reflective surface. Each light particle has momentum, and when it strikes a reflective surface, it imparts that momentum to the reflective sheet. As billions of light particles hit the sheet, they push the sail strongly enough to move a spacecraft. Over time, the solar particles could keep pushing a spaceship faster and faster, allowing it to attain very high speeds. The sails can be as large as football fields, but are 40 to 100 times thinner than a sheet of paper. Inflatable booms provide the sheets with rigidity, and tether the solar sail to the spacecraft. This innovative concept for low-thrust space propulsion works without any propellant and thus provides a wide range of opportunities for high- energy low-cost missions. Offering an efficient way of propulsion, solar sail craft could close a gap in transportation options for highly demanding exploration missions within our solar system and even beyond
Enhance Intrusion Detection Systems Based On SVM and Feed Forward Neural Network
No full textWith large increase of internet users network security is important issues in today era. As variety of users have different requirement, so proper identification of safe network is required. This paper focuses on the network intrusion detection using SVM and neural network. Here SVM classify network behavior into two class first is safe and other is unsafe. Once unsafe network is identified then trained neural network identified attack type of the input sessions. Experiment is done on real dataset and obtained results are better than previous works on different parameters
Comparative Study on Dry Sliding Wear Behaviour of Metal Matrix Hybrid Composites at Room and High Temperature Conditions
No full textIn this present study, hybrid composites was used to fabricate Boron Carbide (B4C) and Molybdenum disulfide (MoS2) particles reinforced aluminium Al2219,to achieve wettablity among Al and B4C the k2TiF6 halide salt was incorporated into Al 2219 alloy. The hybrid composites were successfully fabricated using stir casting technique and then casted samples were characterized by SEM examination. The microstructure examination demonstrate that uniform distribution of B4C and MoS2 particles in matrix Al2219.The monolithic Al2219 and prepared hybrid composites were subjected to Dry sliding wear test using pin-on disc tribometer as for ASTM G99-95 standard and comparative study between room temperature and high temperature(1800C) wear test under different sliding situation were done. The examination room result revels that, the specific wear rate at temperature was found lesser as compared to high-temperature 1800C and the specific wear rate was found to increase with applied loads and sliding distances in both conditions. For both room temperature and high temperature the hybrid composites had a lower specific wear rate when compared to Al2219.The specific wear rate increases with increases in load and sliding distance, the addition of reinforcing particles i.e B4C and MoS2 reduces specific wear rate of composites and the addition of secondary reinforcement MoS2 has significant effect on reducing wear rate of prepared hybrid composites for both room temperature and high temperature. The worn surface of pin samples tested under both conditions were analyzed using SEM
Study of Abrasive Wear Behaviour of Al-Cu-Mg/Titanium Dioxide Particulate Reinforced Metal Matrix Composite
No full text In the present investigation, Aluminium based metal matrix composites containing Titanium Dioxide (TiO2) are synthesized using stir-cast method. Macro structural studies have shown near uniform distribution of Titanium dioxide particulates in the matrix material. Influence of TiO2 particulate on dry sand rubber wheel abrasion wear characteristics was carried out to explore the feasibility of using this metal matrix composite, developed for abrasion wear resistance application. The details of the results obtained are presented in this paper. Resistance to wear has increased with increase in Titanium dioxide particles; wear has increased with increase in normal load and sliding velocity. Hardness has also increased with increase in weight percentage of TiO2 particles
Effect of Quenching and Ageing Duration on Mechanical Property of Metal Matrix Composite: A Taguchi Technique
No full textThe present study was conducted to understand the influence of quenching media and ageing duration on hardness of aluminum metal matrix composite. The composites are subjected to three types of cooling after solutionizing at 5290C for 2hours and subjected to artificial ageing at 1990C for 4 to 12 hours instep of 4 hours. Brinell hardness was measured as a response of heat treatment process. A mathematical model was developed relating hardness of the composites to quenching media and ageing duration for different weight fraction of composite using statistical approach. The model was checked for adequacy by regression analysis and analysis of variance. The result shows that composites which are quenched in (water + ice) attain maximum hardness for 8 hours ageing duration. The developed model has the adequate predictive capability