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OVERVIEW AND ASSESSMENT OF FORMABILITY EFFECT OF MATERIAL PROPERTIES OF SHEET METAL - A SHORT COMMUNICATION

Abstract

Metal forming is the backbone of modern manufacturing industry besides being a majorindustry in itself. Throughout the world hundreds of million tons of metals go through metalforming processes every year. As much as 15–20% of GDP of industrialized nations comes frommetal forming industry.The industrial metal working process of sheet metal forming is strongly dependenton numerous interactive variables: material behaviour, lubrication, forming equipment. The quality of a stamped commercial part is largely influenced by the material flowwithin the tools during the sheet metal forming operation. Therefore it is important tocontrol the material flow rate to avoid defects such as wrinkling, tearing, surface distortion and springback. This paper presents an outline of published test methods for determination mechanical properties of steel sheet that influence it’s forming characteristics either directly or indirectly, can be measured by uniaxial tensile test. The tensile test results of particular test include the yield strength, ultimate tensile strength, plastic strain ratio, planar anisotropy, strain hardening exponent and strength coefficient.Testing of sheet metal formability has been a long-standing challenge becausevariability in test procedures and testing machines can mask material variations. Inspite of the importance of such testing for manufacturing, few standards exist. Uniaxial tensile stress may be made with specimens obtained from longitudinal, diagonal and transverse relative directions to rolling direction. This review deals with how to determine the important value of formability strain rate coefficient n, Lankford anisotropy coefficient r, Lube and Blank location have the strongest influences on formability. Among these, the effect of anisotropy is most important.

S.P. SUNDAR SINGH SIVAM, K. SARAVANAN, N. PRADEEP, A. SHREYANS JAIN, S.G. SEKAR AND NANDAM VISHAAL

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