The present work deals with the effect of aging on the mechanical and tribological properties Al-Zn-Mg-Cu (AA7068) alloy. The mechanical properties such as tensile strength, compressive strength, hardness and sliding wear of the alloy in as cast and heat treated condition were examined in order to achieve the maximum properties. Microstructural examination of the alloy in as cast and heat treated condition was carried out to observe the effect of aging. SEM study was also done to observe the worn surfaces and the mechanism of material removal. It is observed that there is a substantial improvement in the mechanical and tribological properties of the alloy due to heat treatment as compared to the as cast alloy. The microstructural study of the cast alloy shows primary dendrites of aluminium and intermetallic phases around the inter-dendrites regions. Due to the heat treatment, the identity of the dendritic structure is lost, because of uniform distribution of precipitates, wherein intermetallic phases were seen dispersed within the grains and the grain boundaries. Results show that the tensile strength of the heat treated alloy at 210oC aging temperature has increased by 155% as compared to as cast alloy. The compressive strength and hardness of the alloy at 210oC aging temperature shows improvement of 41% and 54% respectively as compared to as cast alloy. Wear loss of the heat treated alloy at 210oC aging temperature has decreased at an applied load of 20, 40, 60 and 80 N in both 1.57m/s and 3.00m/s sliding speed.
The results of this study would aim to reduce downtime and repair costs for machinery as used in manufacturing environment. The growing emphasis on renewable energy sources like wind, solar and hydroelectric power has resulted in industrial machinery being built in natural ecosystems. To mitigate the possible dangerous environmental effects of these devices, many owners assess and turn to new, better suited lubricants. However, lubricant change periods can surpass years and changing lubricant in large spinning machines is a major undertaking often involving replacement of packings and thorough cleaning as per lube output. With substantial variations in purchasing quality between natural and synthetic lubricants, there must be a good correlation between initial costs and operating benefits. This paper aims at oil film failure with film separation and calculation in journal bearing using ultrasonic technique (NDT), in which the action of specific bearing parameters results in sufficiently understated condition until lube film failure in journal bearing. Bearing life refers to the total number of revolutions (time period) and which working under lubrication film. Lubrication film depends upon many parameters like as; Insufficient lubricants supply; Misalignment loading of bearing on to the shaft; Viscostiy of lubricants; Roughness of surface(Asperities);Temperature; Vibration; Some debries involved in lubricants during working condition from inside the surface and it's also depend upon lubricant properties. This work is aimed monitoring the lubrication film failure detection using ultrasonic wave reflection.
In the present scenario, the designs of S I engine being used in automotives by various manufacturers are not properly suitable to Indian climate condition. India is among those tropical countries where the variation in the temperature is having very vast range i.e. from 0°C to 50°C in various regions of the country. Looking in to this vast varying temperature range, it is very difficult to say that which temperature is most suited for operating condition of engines and will give the best performance levels as far as SFC & BP is concerned. In this work, it has been tried to investigate the best option to run the SI engine and simultaneously to maintain the emission norms. Today research and development in the field of gasoline engines have to face double challenge; on one hand, fuel consumption has to be reduced, while on the other hand, even more stringent emission standard have to be fulfilled. The development of engines with its complexity of in-cylinder process requires modern developed tools to exploit the full potential in order to reduce fuel consumption. There are many strategies for improving fuel economy and reducing exhaust emission HC & CO. The experimental study is carried out on a three cylinders, four stroke, petrol, carbureted, water cooled engine test rig connected to eddy current type dynamometer. The objective of this work was to examine engine performance parameter i.e. specific fuel consumption (SFC), brake power (BP) and also exhaust emission on Varying Engine Temperature at 50, 60, 70, 80° C and at an engine speed of 1500, 2000, 2500 rpm with respect to engine load 6, 9, 12 kg. The results are shown by various graphs with effect of engine temperature on specific fuel consumption, brake power, engine speed, engine load and emission levels of Nox, HC, CO for gasoline and LPG to improve fuel consumption.
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