Paper Title:
A Suitable Criterion for Precise Determination of Incipient Necking in Sheet Materials
  Abstract

Forming limit diagram (FLD) is a measure of the formability of a sheet material. The major-minor strain pairs that are closest to the neck on multiple specimens of various strain paths are utilized to construct a boundary between safe and unsafe zones. The challenge to obtain the FLD is the determination of incipient necking. Three approaches to determine the limit strains have been investigated and compared in this research in order to establish the optimal one for implementation: (1) commonly used Bragard criterion ( 1)e Br with periodic grids; (2) tracking the region of large local strains from strain history to locate the instance when critical major strain ( 1)e cr happens; (3) post-processing of strain history to locate the inflection in the major strain rate curve 1 max (e&&) at the onset of localization. The last criterion of inflection in strain rate 1 max (e&&) carries both a numerical and a physical meaning towards developing an understanding of flow localization, formability and fracture.

  Info
Periodical
Materials Science Forum (Volumes 519-521)
Edited by
W.J. Poole, M.A. Wells and D.J. Lloyd
Pages
111-116
DOI
10.4028/www.scientific.net/MSF.519-521.111
Citation
Q. Situ, M. K. Jain, M. Bruhis, "A Suitable Criterion for Precise Determination of Incipient Necking in Sheet Materials", Materials Science Forum, Vols. 519-521, pp. 111-116, 2006
Online since
July 2006
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Price
$32.00
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