Title: Theoretical extension of elastic-perfectly plastic deformation length in roll forming of a channel section

Authors: Roohollah Azizi Tafti; Hassan Moslemi Naeini; Mehdi Salmani Tehrani; Bernard F. Rolfe; Matthias Weiss

Addresses: Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, 14115-143, Islamic Republic of Iran ' Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, 14115-143, Islamic Republic of Iran ' Mechanical Engineering Department, Isfahan University of Technology, Isfahan, 8415683111, Islamic Republic of Iran ' School of Engineering, Deakin University, P.O. Box 3220, Geelong, Victoria, Australia ' Institute for Frontier Materials, Deakin University, P.O. Box 3220, Geelong, Victoria, Australia

Abstract: In this paper, the Young's modulus and the yield strength of the strip are considered in order to modify the deformation length analysis proposed by Bhattacharyya et al. New analytical equations are developed assuming an elastic-perfectly plastic material behaviour and the deformation length analysed for the simple case of roll forming a U-channel; the analytical results are verified by comparison with experimental data found in the literature. The proposed elastic-plastic deformation length is shorter than Bhattacharyya's which is rigid-perfectly plastic. It is observed that the influence of elastic properties on the deformation length is not as significant as the plastic properties; however, the authors believe that the elastic effects become more important under conditions where a major area of the strip is under elastic deformation such as when the flange length is long.

Keywords: deformation length; analytical modelling; roll forming; channel section; plastic deformation; Young's modulus; yield strength; elastic-plastic deformation; elastic deformation; flange length.

DOI: 10.1504/IJMPT.2013.058955

International Journal of Materials and Product Technology, 2013 Vol.47 No.1/2/3/4, pp.33 - 45

Received: 04 Feb 2013
Accepted: 02 Aug 2013
Published online: 28 Jun 2014 *

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