Prediction of six or eight ears in a drawn cup based on a new anisotropic yield function

2006 ◽  
Vol 22 (1) ◽  
pp. 174-193 ◽  
Author(s):  
J YOON ◽  
F BARLAT ◽  
R DICK ◽  
M KARABIN
Keyword(s):  
Yield Function ◽  
Anisotropic Yield Function

Effect of Material Frame Rotation on the Hardening of an Anisotropic Material in Simple Shear Tests

2018 ◽  
Vol 85 (12) ◽  
Author(s):  
Kelin Chen ◽  
Stelios Kyriakides ◽  
Martin Scales
Keyword(s):  
Simple Shear ◽  
Plastic Anisotropy ◽  
Yield Function ◽  
Strain Response ◽  
Shear Tests ◽  
Stress Strain ◽  
Anisotropic Yield Function ◽  
Torsion Experiment ◽  
Thin Walled Tube ◽  
Material Frame

The shear stress–strain response of an aluminum alloy is measured to a shear strain of the order of one using a pure torsion experiment on a thin-walled tube. The material exhibits plastic anisotropy that is established through a separate set of biaxial experiments on the same tube stock. The results are used to calibrate Hill's quadratic anisotropic yield function. It is shown that because in simple shear the material axes rotate during deformation, this anisotropy progressively reduces the material tangent modulus. A parametric study demonstrates that the stress–strain response extracted from a simple shear test can be influenced significantly by the anisotropy parameters. It is thus concluded that the material axes rotation inherent to simple shear tests must be included in the analysis of such experiments when the material exhibits anisotropy.

scholarly journals Yield Stress of Randomly Perforated Sheets and Anisotropic Yield Function.

1997 ◽  
Vol 40 (4) ◽  
pp. 353-361
Author(s):  
Yasuhide NAKAYAMA ◽  
Shigeru NAGAKI ◽  
Takeji ABE
Keyword(s):  
Yield Stress ◽  
Yield Function ◽  
Anisotropic Yield Function ◽  
Perforated Sheets

Wrinkling of an Unevenly Stretched Sheet Metal

1989 ◽  
Vol 111 (3) ◽  
pp. 235-242 ◽  
Author(s):  
Xiaofang Wang ◽  
L. H. N. Lee
Keyword(s):  
Finite Element Method ◽  
Sheet Metal ◽  
Strong Influence ◽  
Flexural Rigidity ◽  
Plastic Material ◽  
Yield Function ◽  
Material Parameters ◽  
Varying Thickness ◽  
Anisotropic Yield Function ◽  
Elastic Plastic Material

The onset of wrinkling of an unevenly stretched sheet metal subject to finite deformation is analyzed by an incremental finite element method. The sheet metal is modeled as a plate made of an elastic-plastic material. Hill’s anisotropic yield function and bifurcation criterion are employed in the analysis. The effects of geometrical and material parameters upon the onset of wrinkling are investigated. In the bifurcation analysis, attention is given to the changing and varying thickness of the sheet metal which could have a strong influence on the flexural rigidity of the sheet. Numerical results are presented herein.

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