Informatics Publishing Limited

A. Suresh Babu ¹, V. Jayabalan ¹

Affiliations
1 Dept. of Manufacturing Engg., Anna University, Chennai, IN

Abstract

The mechanics of composite materials and their fracture behaviors are really complex. The reason for this is inconsistent process stability and reliability, combined with production and processing problems. In this work, an attempt has been made to statistically analyse the tensile behavior of metal matrix composite. Composite of Aluminium alloy containing 5 to 20 % volume fraction of Al₂O₃ particles of 15 μm size was prepared by adding alumina particles to a vigorously agitated semi solid Aluminum alloy. Prior to this, alumina particles were subjected to preheating at 800°C for 5hrs. Particles were added to the Aluminium alloy heated to 850°C by using a mixer in the nitrogen medium. Twenty tension tests were performed for each volume fraction according to ASTM standards B557 (American Society of Testing Materials standards) and using the test data, the corresponding weibull distribution was obtained. The reliability of the composite characteristics in terms of its tensile strength was assessed. An important implication of the present study is that the weibull distribution describes more appropriately, the experimentally measured strength data.

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A. Asha ¹, S. M. Kannan ², V. Jayabalan ³

Affiliations
1 Dept. of Mech. Engg., K L N College of Engg., Pottapalayam, Sivagangai Dist., TN, IN
2 Dept. of Mech. Engg., Velammal College of Engg. and Technology, Madurai, IN
3 Dept. of Manufacturing Engg., Anna University, Chennai, IN

Abstract

Selective assembly is an approach for reducing the overall variation and thus improving the quality of an assembled product. Selective assembly method can achieve tight assembly tolerance when the components are manufactured with wider tolerances. This approach is often less costly than a tolerance design using tighter specifications on individual components. It leads to high quality assembly from relatively low precision components. In this paper a valve train assembly with three mating parts (cam shaft, tappet, valve stem) is considered for analysis. Subsequently, a memetic algorithm is used to obtain the best combination of selective groups. Based on the best combination obtained the assembly is done in three stages to completely use all the components. The variation in clearance is minimized and the surplus parts are reduced to a great extent.

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B. A. Saravanan ¹, V. Jayabalan ¹, Moshe J. Aaron ², P. Jesu Antony Xavier ²

Affiliations
1 Department of Manufacturing Engineering, CEG Campus, Anna University, Chennai-600025, IN
2 Department of Mechanical Engineering, CEG Campus, Anna University, Chennai-600025, IN

Abstract

In supplier selection process, various kinds of works had been carried out to evaluate and select the supplier. But, still there is lack of transparency between purchase managers and suppliers. Suppliers are evaluated and ranked based on the attributes such as quality, delivery, cost etc. In real world scenario, purchase managers' prioritization on the supplier selection attributes are varied from the theoretical perceptions. To expose the real condition in the supplier selection in industries, this paper has carried out a survey to know about purchase managers' actual choice of supplier in an experimental setting. Discrete Choice Analysis (DCA) tool has been used to find the actual selection of suppliers based on the supplier selection factors. Finally the actual scenario of the purchase managers' preferences had been established and further the result provides useful information for many types of strategic decisions.

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