Informatics Publishing Limited

Susant Kumar Misra ¹, P. Chandramohan ², A. Satyanarayana Murty ³, Jitendra Kumar Panigrahi ⁴, R. Mahadevan ¹

Affiliations
1 INDOMER Coastal Hydraulics (P) Ltd, 63 Gandhi Road, Alwar Thirunagar, Chennai – 600 087, IN
2 INDOMER Coastal Hydraulics (P) Ltd, 63 Gandhi Road, Alwar Thirunagar, Chennai – 600 087, IN
3 Department of Marine Sciences, Berhampur University, Berhampur – 760 007, IN
4 DHI – NTU Research Centre, DHI Water and Environment, Singapore – 128388, SG

Abstract

The objective of the present study is to simulate the tide induced flow field in the Bay of Bengal (BOB) using MIKE 21 HD module of DHI. Later these currents that were measured in the coastal region between Kodikarai in Tamilnadu and Digha in West Bengal along the East Coast of India close to nearly 50 m water depth were also compared with that of the simulated. Between Nagapattinam (Lat. 10.76º N) and Paradip (Lat. 20.26º N), over a distance of nearly 1000 km (~10º of latitude), the tides propagate from deep water to the coast with their fronts nearly parallel to the coast. The variation of the tidal ranges between Nagapattinam to Paradip was found to be from 0.62 m to 1.87 m. The simulated current magnitudes in BOB were observed to increase slowly from south to north (i.e. 0.075 m/s at Nagapattinam to 0.249 m/s at Paradip), as the magnitudes of M2 and S2 tidal constituents increase from Nagapattinam to Paradip. The highest tidal currents of the order of 0.4 m/s were found at the Head of the Bay. Similarly, the directions of tide induced currents during the flood and the ebb phases of tides were observed to remain almost same at all stations from Nagapattinam to Paradip along the ECI.

Keywords

Naval Hydrographic Charts, Tidal Constituents, MIKE 21 Hydrodynamic Module, MIKE 21 Toolbox, Mike 0 Tool box, ECI.

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P. Chandrasekar ¹, Sriram ¹, Santhosh ¹, V. Balusamy ², P. Chandramohan ³

Affiliations
1 Dr. Mahalingam College of Engg. and Tech., Pollachi 642 003, Tamilnadu, IN
2 P.S.G. College of Technology, Coimbatore 641 004, Tamilnadu, IN
3 Sri Krishna College of Engineering, Coimbatore 641 008, Tamilnadu, IN

Abstract

The Titanium-Titanium boride (Ti-TiB) composite was subjected to surface modification using laser surface treatment. A significant increase in surface hardness to 980 VHN, relative to 513 VHN for the untreated material occurred with a laser energy input of about 30 kJ/m, achieved with 20 and 30 mm/s traverse speed. This increase in hardness corresponds to increase in surface volume fraction of TiB whiskers to about 65 % at about 30 kJ/m and above.

Keywords

Laser Treatment, Metal Matrix Composites, X-Ray Diffraction and Scanning Electron Microscopy.

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P. Chandramohan ¹, S. S. Mohamed Nazirudeen ², Srivatsavan ¹

Affiliations
1 Sri Krishna College of Engineering and Technology, Coimbatore- 641004, IN
2 PSG College of Technology, Coimbatore-641004, IN

Abstract

Duplex stainless steels were developed in the early thirties in Sweden and in France. The first duplex steels had about 65% of ferrite in the solution annealed condition and the high ferrite content resulted in rather bad mechanical properties in the Heat affected Zone after welding. Secondary phases play an important role in determining the properties of duplex stainless steel. In this paper, a brief discussion is made about the formation and effect of various phases like sigma (σ), cubic (χ), R-, α¹  G-, τ and laves phase along with the acceptance criteria for secondary phases.

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P. Chandramohan ¹, S. John Alexis ², R. Srivatsavan ³

Affiliations
1 Dept. of Mechatronics Engg., Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641008, IN
2 Dept. of Mechanical Engg., Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641008, IN
3 Mechanical Sciences, Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641008, IN

Abstract

This paper discusses the various fabrication techniques and their automation being used in composite material fabrication. Research and development efforts have made some of the structures amenable to computer aided design and numerical control fabrication. About 70% of total cost of Boron and graphite preliminary composites is spent on fabricating into end shapes. Automation could reduce this cost by 50%. Automated processing of tapes has been widely investigated to reduce lay-up costs. One such approach is using automated facilities at the material supplier's plant to handle alternative materials, thus reducing handling in the processor's facility. These concepts include wide tapes [up to 1.2m], uniweave fabric, and fabrics of conventional construction which are unrolled, automatically cut into full or partial plies, sorted into kits, and then laid up onto a tool.
The next step in composite material fabrication is the paperless factory, where automation is being developed and applied in handling, storage and retrieval of frozen materials through automated cutting, kitting and lay up. Assembled parts would be carried automatically to autoclaves for cutting on an overhead monorail or other conveyor.

Keywords

SMC, PMC, LCM, Prepreg, Autoclave.

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P. Chandramohan ¹, S. John Alexis ², R. Srivatsavan ³

Affiliations
1 Dept of Production Engg, Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641 008, IN
2 Dept of Mechanical Engg, Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641 008, IN
3 Mechanical Sciences, Sri Krishna College of Engineering and Technology, Kuniamuthur, Coimbatore-641 008, IN

Abstract

The increased use of the sheet metal in industries, because of its increased strength to weight ratio demands quick and efficient manufacturing methods. Conventional sheet metal forming processes result in the increase of tool and die making and material cost This has made the researchers to think in a different direction, which ended up in sheet metal forming by using flexible media. In this paper, a detailed study has been done on the analysis of sheet metal forming using liquid media alone. The results of the analysis are given by means of graphs.

Keywords

Liquid Media, Stretching, Punch, Die, Pressure.

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