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An Experimental and FE Analysis of Helical Gear
for Bending Stress at Critical Section
--Prashant J Patil and M S Patil
The increasing demand for quiet power transmission in machines, vehicles and generators has created a growing demand for a more precise analysis of the characteristics of gear systems. In addition, the success in engine noise reduction promotes the production of quieter gear pairs for further noise reduction. In the process of gear design, the pressure angle of gear plays a vital role. It is because pressure angle simultaneously affects the base circle radius of the involutes profile and the minimum number of teeth to avoid interference varies with pressure angle. Moreover, the Lewis form factor used in Lewis equation to account for bending stress at tooth root depends upon the number of teeth and pressure angle. Higher value of pressure angle has greater length of contact, whereas smaller value of pressure angle gives quietness in operation. Nowadays, a trend is followed in using different pressure angles at driving and costal side of gear tooth. The work involves experimentation using strain gauge and 3D photoelasticity techniques to study the effect of pressure angle on bending stress at critical section of helical gear. The results obtained from the experimental analysis have been compared with theoretical and finite element method results. © 2016 IUP. All Rights Reserved.
Thermostructural and Dynamic Analysis of Expansion Joint
Due to Dynamic Response of Gas Pressure Excitation
and Thermal Expansion
--Chetan Kaduba Mahajan and Ganesh D Korwar
Expansion joints are used in the various locations of the ducts carrying the gas at high pressure and temperature. These joints absorb vibrations due to flow of gas and also absorb dimensional variations of ducts due to pressure and thermal expansion. Failure of expansion joint has been observed. Sleeve of the expansion joint is failing, and because of this failure, bellows directly exposed to hot gases are also failing. A Finite Element Analysis (FEA) is carried out to investigate the causes of failure. © 2016 IUP. All Rights Reserved.
The Effect of Dimple Density on Tribological Performance
of Polyamide (PA66) Composites
--G S Pendbhaje, V S Aher, A K Mishra and V D Wakchaure
Surface texturing has emerged in the last decade as a viable option of surface engineering, resulting in significant improvement in tribological properties like wear resistance, coefficient of friction, load carrying capacity, etc. of mechanical components. In this paper, the effect of surface texturing on tribological properties of Polyamide (PA66) composite materials is studied considering elliptical texture pattern with varying orientations so as to observe the comparative friction and wear behavior of Polyamide (PA66) composites with and without surface texturing on mating surface at dry and wet lubrication using a pin-on-disc tribometer. The results show that the coefficient of friction varies considerably with surface texture patterns; some texture patterns show a higher load carrying capacity and due to that negative coefficient of friction is observed. Scanning Electron Micrographs (SEM) show that wear of some textured surfaces is reduced compared with the non-textured surface at both the lubricating conditions.
© 2016 IUP. All Rights Reserved.
Machining of Aluminum Hybrid Metal Matrix Composite
by Wire Electrical Discharge Machine: A Review
--G Gokulakannan, R V Praveena Gowda and S Ramesh
Aluminum (Al) Hybrid Metal Matrix Composites (HMMCs) are extensively used in aerospace, automotive and other industries, replacing the usage of single reinforced metal matrix composite material. In the last five years, due to the advancement of technology, HMMCs have witnessed largely enhanced application and usage. HMMCs exhibit robust and well-enhanced properties when compared to the single reinforced composite materials. In this review, different types of reinforcements used by the researchers are discussed. Further, the volume fraction of reinforcement and the types of fabrication method adopted are also examined. Selecting suitable process parameter for the fabrication of composite material is important, which results in equal distribution of reinforcement in the matrix material. For machining, composite material nontraditional machine was adopted by most of the researchers; especially Wire Electrical Discharge Machine (WEDM) and Electrical Discharge Machine (EDM) are widely used due to their dimensional accuracy and less distortion over the surface of the workpiece. The application of Al HMMCs, problems encountered in the machining of HMMCs and the future possible research trends in this area are also discussed. © 2016 IUP. All Rights Reserved.
Ranking of Ordering Policies by Simple Additive Weighting (SAW)
Technique for Indian Automotive Industry
--Amit Gupta
In the current scenario of high competition, there is a need for emerging approaches for inventory management. Right selection of ordering policies is one of the important processes for the development of any industry. Poor inventory management leads to retention of inventory and hence causes losses to the industry. In this paper, an analytical model has been developed for ranking of ordering policies using Simple Additive Weighting (SAW) technique. The ranking criteria are considered from the papers selected from the available literature. © 2016 IUP. All Rights Reserved.
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