Effect of strain gradient and curvature on forming limit diagrams for anisotropic sheets

1991 ◽  
Vol 9 (4) ◽  
pp. 253-268 ◽  
Author(s):  
M. F. Shi ◽  
J. C. Gerdeen
Keyword(s):  
Strain Gradient ◽  
Forming Limit ◽  
Forming Limit Diagrams

The Strain Gradient Approach for Deformation Localization and Forming Limit Diagrams

1996 ◽  
Vol 7 (4) ◽  
pp. 265-278 ◽  
Author(s):  
Y.W. Wang, ◽  
S.A. Majlessi, ◽  
J. Ning, ◽  
E.C. Aifantis,
Keyword(s):  
Strain Gradient ◽  
Forming Limit ◽  
Deformation Localization ◽  
Forming Limit Diagrams ◽  
Gradient Approach

The bending dependency of forming limit diagrams

2018 ◽  
Vol 12 (5) ◽  
pp. 815-825 ◽  
Author(s):  
Felix M. Neuhauser ◽  
Oscar Terrazas ◽  
Niko Manopulo ◽  
Pavel Hora ◽  
Chester Van Tyne
Keyword(s):  
Forming Limit ◽  
Forming Limit Diagrams

A pragmatic approach to accommodate in-plane anisotropy in forming limit diagrams

2014 ◽  
Vol 62 ◽  
pp. 5-17 ◽  
Author(s):  
Krishnaswamy Hariharan ◽  
Ngoc-Trung Nguyen ◽  
Frédéric Barlat ◽  
Myoung-Gyu Lee ◽  
Ji Hoon Kim
Keyword(s):  
Forming Limit ◽  
Pragmatic Approach ◽  
Forming Limit Diagrams ◽  
Plane Anisotropy

A dislocation-model of forming limit diagrams of FCC metal sheet with combination of cube and copper orientations

2005 ◽  
Vol 402 (1-2) ◽  
pp. 149-157 ◽  
Author(s):  
X.Y. Wen ◽  
T. Zhai ◽  
C.H. Xiao ◽  
S. Ningileri ◽  
Z. Li ◽  
...  
Keyword(s):  
Metal Sheet ◽  
Forming Limit ◽  
Dislocation Model ◽  
Forming Limit Diagrams ◽  
Fcc Metal

Experimental and analytical studies on the prediction of forming limit diagrams

2009 ◽  
Vol 44 (4) ◽  
pp. 1252-1257 ◽  
Author(s):  
S. Ahmadi ◽  
A.R. Eivani ◽  
A. Akbarzadeh
Keyword(s):  
Forming Limit ◽  
Forming Limit Diagrams ◽  
Analytical Studies

Orientation and Path Dependence of Formability in the Stress- and the Extended Stress-Based Forming Limit Curves

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
C. Hari Manoj Simha ◽  
Kaan Inal ◽  
Michael J. Worswick
Keyword(s):  
Strain Path ◽  
Path Dependence ◽  
Forming Limit ◽  
Stress Space ◽  
Forming Limit Diagrams ◽  
Metall Trans ◽  
Strain Paths ◽  
Strain Path Changes ◽  
Path Dependent ◽  
Forming Limit Curves

This article analyzes the formability data sets for aluminum killed steel (Laukonis, J. V., and Ghosh, A. K., 1978, “Effects of Strain Path Changes on the Formability of Sheet Metals,” Metall. Trans. A., 9, pp. 1849–1856), for Al 2008-T4 (Graf, A., and Hosford, W., 1993, “Effect of Changing Strain Paths on Forming Limit Diagrams of Al 2008-T4,” Metall. Trans. A, 24A, pp. 2503–2512) and for Al 6111-T4 (Graf, A., and Hosford, W., 1994, “The Influence of Strain-Path Changes on Forming Limit Diagrams of Al 6111 T4,” Int. J. Mech. Sci., 36, pp. 897–910). These articles present strain-based forming limit curves (ϵFLCs) for both as-received and prestrained sheets. Using phenomenological yield functions, and assuming isotropic hardening, the ϵFLCs are transformed into principal stress space to obtain stress-based forming limit curves (σFLCs) and the principal stresses are transformed into effective stress and mean stress space to obtain the extended stress-based forming limit curves (XSFLCs). A definition of path dependence for the σFLC and XSFLC is proposed and used to classify the obtained limit curves as path dependent or independent. The path dependence of forming limit stresses is observed for some of the prestrain paths. Based on the results, a novel criterion that, with a knowledge of the forming limit stresses of the as-received material, can be used to predict whether the limit stresses are path dependent or independent for a given prestrain path is proposed. The results also suggest that kinematic hardening and transient hardening effects may explain the path dependence observed in some of the prestrain paths.

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