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N. V. V. S. Sudheer ¹, K. V. J. Rao ²

Affiliations
1 R.V.R. & J.C. College of Engineering, Guntur-522 019, Andhra Pradesh, IN
2 J.B. Institute of Engineering and Technology, Hyderabad-500 075, Andhra Pradesh, IN

Abstract

This paper presents an experimental probe into the effects of carburising and oxidising flames on the surface finish in turning of aluminium metal matrix composite. The experimental design is performed by using 33 full factorial designs. The experiments were conducted by varying cutting speed, feed and depth of cut in three levels each by providing external energies of carburizing flame and oxidizing flame separately and test results were analyzed. The measured values of surface finish are subjected to ANOVA and the effects of parameters, speed, feed and depth of cut are estimated. From the obtained surface finish values, the comparison is done between carburizing flame, oxidizing flame and dry cutting. The observation of results proved that carburising flame assisted turning operation yields better surface finish compared to dry and oxidising flame assisted turning. The mathematical models were developed for three conditions separately by using multiple regression.

Keywords

Carburising Flame, Oxidising Flame, Al-MMC, BUE, ANOVA.

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M. Madhavi ¹, K. Rama Swamy ², K. V. J. Rao ³, K. Narayana Rao ⁴

Affiliations
1 Dept. of Mechanical Engg., M V S R Engg. College, Hyderabad, IN
2 Defense Research & Development Organization, Hyderabad, IN
3 St. Peter’s College of Engineering, Hyderabad, IN
4 AICTE, New Delhi, IN

Abstract

Composite pressure vessels developed by filament winding technology falls into two categories i.e., pressure vessels with equal pole openings & unequal pole openings. Usually composite pressure vessels with equal pole openings can be developed with geodesic paths. Geodesic lines connect two points along the shortest distance over the surface. In this case no friction force is required to keep the fiber from slipping, since it follows a self-stable trajectory. There are, however situations where it is not possible to place fibers, at least in some region of the mandrel, on the geodesic curve. It implies that we have to resort to modified helical winding (non-geodesic) at cylindrical portion or dish ends or both. A composite pressure vessel like CRMC (composite rocket motor casing) with unequal pole opening is an example of this. In the present study, a composite pressure vessel with unequal pole openings considering deviation from the geodesic path only on the cylindrical portion is designed, developed and tested for burst pressure. The shell is subjected to uniform internal pressure and the conditions of thin walled structure and balanced symmetry winding pattern with carbon T300/Epoxy are considered.

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