Manufacturing Technology Today

M. Arularasu ¹, B. Thamaraikannan ¹

Affiliations
1 Dept, of Production Engineering, Government College of Technology, Coimbatore, IN

Abstract

The objective of this work is to find causes of failure of furnace hood and to provide remedial measures to extend the working life of furnace hood. By visual examination, it is found that concave and convex deformation occurs at the furnace hood, and finally fracture takes place. This results in thermal fatigue failure. Further, experimental examinations by metallographic, hardness and Impact strength measurement of the normal and failed sample have been conducted. It is found that the cause of failure is due to the presence of more amount of carbide. In addition, the carbide content is reduced by solution treatment. Using ANSYS software, stress and strain were analyzed for the furnace hood of existing design and modified design. The obtained result of modified design shows that by minimizing the stress and strain will Improve the life of furnace hood.

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M. Arularasu ¹, B. Thamarai Kannan

Affiliations
1 Department of Production Engineering, Government College of Technology, Coimbatore-13, IN

Abstract

Recently the shape memory alloys are using as new functional materials for many applications such as couplings, sensors, and actuator. This project deals with the new Idea of self-sensing and self-repairing of bolted joint using piezoelectric material and shape memory alloys (SMA). Power transmission loss occurs due to the loosening of nut. This loosening is occur due to the vibratory motion of the system. The SMA has good damping capacity, so it is used as an actuator to retain power loss. The basic principles behind this concept are piezoelectric effect and shape memory effect. Piezoelectric effect produces voltage corresponding to loosening of nut. The produced voltage in the range of millivolts is not sufficient to heat the SMA. So produced voltage is amplified by using amplifier. This voltage is used to heat the Nitinol-SMA washers, which in turns expand to maintain torque transmission. Also cryogenic SMA washer act as a locking device.

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