An improvement of the time dependent method based on the coefficient of correlation for the determination of the forming limit curve

Merklein M, Kuppert A, Affronti E (2014)


Publication Type: Conference contribution

Publication year: 2014

Journal

Publisher: Trans Tech Publications Ltd

Book Volume: 1018

Pages Range: 215-222

Conference Proceedings Title: Advanced Materials Research

ISBN: 9783038352457

DOI: 10.4028/www.scientific.net/AMR.1018.215

Abstract

Due to the global energy policy according to the aims of economic efficiency and environmental compatibility the production of lightweight constructions is nowadays a need in many fields of mechanical engineering, especially in automotive and aerospace sectors. The substitution of conventional deep drawing steels with modern sheet metals, i.e. aluminium or high strength steel, provides a positive contribution towards this trend. Prerequisite for an efficient application of these resources is a comprehensive material characterization including the analysis of the formability as well as the failure behaviour. Regarding the accurate prediction of forming behaviour, a robust failure criterion is necessary in order to perform the numerical simulation designs by using finite element method (FEM). The leading criterion used for sheet metal forming is the forming limit diagram (FLD). The FLD gives a graphical description of material formability by plotting the major strain values related to the minor strain values to failure in a curve called forming limit curve (FLC). With the improvement of the digital image correlation (DIC) techniques, which provide very accurate strain measurement, new methods relied on the strain history of the specimen during the test are proposed to determine the FLC. Within this paper, the time dependent method based on the coefficient of correlation is investigated. In particular an improvement dependent on experimental parameter is presented in order to increase its sensibility and reliability for different materials.

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APA:

Merklein, M., Kuppert, A., & Affronti, E. (2014). An improvement of the time dependent method based on the coefficient of correlation for the determination of the forming limit curve. In Marion Merklein, Jörg Franke, Hinnerk Hagenah (Eds.), Advanced Materials Research (pp. 215-222). Trans Tech Publications Ltd.

MLA:

Merklein, Marion, Andreas Kuppert, and Emanuela Affronti. "An improvement of the time dependent method based on the coefficient of correlation for the determination of the forming limit curve." Proceedings of the Advanced Materials Research Ed. Marion Merklein, Jörg Franke, Hinnerk Hagenah, Trans Tech Publications Ltd, 2014. 215-222.

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