DUCTILITY IMPROVEMENT OF HARD -TO- WORK MATERIALS
Keywords:
Ductility Improvement, Hard-to-work Materials, Plane Strain ConditionsAbstract
The working range is limited to the strain range starting from elastic point to instability point. In the ductile or soft materials the working range is usually very large but in the hard-to-work (Titanium in this case), this range is very small. In this paper attempt has been made to improve the ductility of Titanium (one of the hard-to-work material) under plane strain conditions and actual strain conditions. It has been found that there is 15.5 % increase in the ductility of the material with plane strain conditions and with actual strain conditions there is 10.5 % increase in the ductility. Bridgeman has confirmed experimentally that many materials flow plastically under high hydrostatic stress. Hydrostatic stress is one whose value is same along the three axes. Thus hydrostatic stress is contributory factor for increase in the ductility of the material. Thus working range of hard-to-work materials increase which helps in providing wider range for working on materials like Titanium and its alloys.
Downloads
References
Johnson W and Mellor P B (1966), “Plasticity for Mechanical Engineers”, D. Van Nostrand Company Ltd., London.
Singhal R P and Das S R (1987), “Some Experimental Observations in the Shear Spinning of Long Tubes”, Journal of Mechanical Working Technology, Vol. 14, 149-157.
Singhal R P, Saxena P K and Prakash Rajnish (1990), “Estimation of Power in Spear Spinning of Long Tubes in Hard to-work Materials”, Journal of Material Processing Technology, Vol. 23, 29-40.
Singhal R P and Prakash Rajnish (1990), “An Experimental Study of Shear Spinning of Tube of Hard-to-work Materials, Advanced Technology of Plasticity, Vol. 2, 853-857.
Prakash Rajnish and Singhal R P (1995), “Shear Spinning Technology for Manufacture of Long Thin Wall Tubes of Small Bore”, Journal of Materials Processing Technology, Vol. 54(1-4), 186-192.
Bridgman P W (1955), “Investigations on Large Plastic Deformation and Fracture”, Foreign Publishing House, U.S.S.R. Academy of Sciences.
Rowe G W (2002), “Principles of Industrial Metal Working Process”, CBS Publishers and Distributors, New Delhi.
Quigley E and Monaghan J (2000), “Metal Forming: An Analysis of Spinning Process”, Journal of Materials Processing Technology, Vol. 103, 114-119.
Gotoh M and Yamashita M (2001), “A Study of High-rate Shearing of Commercially Pure Aluminium Sheet”, Journal of Material Processing Technology, Vol. 110(3), 253-264.
Wong C C, Dean T A and Lin J (2003), “A Review of Spinning, Shear Forming and Flow Forming Processes”, International Journal of Machine Tools and Manufacture, Vol. 43(14), 1419-1435.
Levy B S, Van Tyne C J and Stringfield J M (2004),“Characterizing Steel Tube for Hydroforming Applications”, Journal of Materials Processing Technology, Vol. 150(3), 280-289.
Jansson M, Nilsson L and Simonsson K (2007), “On Process Parameter Estimation for the Tube Hydroforming Process”, Journal of Materials Processing Technology, Vol. 190(1-3), 1-11.
Borto, P, Ceretti E and Giardini C (2008), “The Determination of Flow Stress of Tubular Material for Hydroforming Applications”, Journal of Materials Processing Technology, Vol. 203(1-3), 381-388.
Mori K I, Ishiguro M and Isomura Y (2009), “Hot Shear Spinning of Cast Aluminium Alloy Parts”, Journal of Materials Processing Technology, Vol. 209(7), 3621-3627.
