The effect of rate sensitivity on history dependent forming limits of anisotropic sheet metals

1991 ◽  
Vol 9 (4) ◽  
pp. 233-240 ◽  
Author(s):  
Q. Q. Nie ◽  
D. Lee
Keyword(s):  
Rate Sensitivity ◽  
Sheet Metals ◽  
Forming Limits

scholarly journals The Effects of Lubrication on the Press Forming Limits of Sheet Metals

1967 ◽  
Vol 10 (37) ◽  
pp. 188-196 ◽  
Author(s):  
Kiyota YOSHIDA ◽  
Kunio MIYAUCHI ◽  
Hiroshi KOMORIDA
Keyword(s):  
Sheet Metals ◽  
Forming Limits ◽  
Press Forming ◽  
The Press

Modeling of Necking/Shear Failure of Aluminum Sheet Metals With Consideration of Void Nucleation and Growth

2001 ◽  
Author(s):  
W. Y. Chien ◽  
J. Pan ◽  
S. C. Tang
Keyword(s):  
Plane Strain ◽  
Shear Failure ◽  
Failure Strain ◽  
Void Nucleation ◽  
Sheet Material ◽  
Plastic Anisotropy ◽  
Rate Sensitivity ◽  
Sheet Metals ◽  
Plane Strain Tension ◽  
Aluminum Sheets

Abstract Failure of two aluminum sheets, AA5754 and AA6111, under stretching conditions is analyzed using a combined plane stress and plane strain approach. The sheet material is modeled by an elastic-viscoplastic constitutive relation that accounts for material plastic anisotropy, material rate sensitivity, and the softening due to the nucleation, growth, and coalescence of microvoids. Failure processes of sheet metals are modeled under plane strain tension. Also, failure strains are determined under bending conditions when the necking mode is suppressed. The results are consistent with experimental observations where the failure strain of the aluminum sheets increases significantly under bending conditions. The results indicate that when a considerable amount of necking is observed under stretching conditions, failure strains under bending conditions are higher.

Neck growth and forming limits in sheet metals

1982 ◽  
Vol 24 (3) ◽  
pp. 157-173 ◽  
Author(s):  
D. Lee ◽  
F. Zaverl
Keyword(s):  
Sheet Metals ◽  
Forming Limits ◽  
Neck Growth

Forming Limits Prediction of FCC Sheet Metal Adopting Crystal Plasticity

2007 ◽  
Vol 340-341 ◽  
pp. 179-186
Author(s):  
Wing Bun Lee ◽  
Yi Ping Chen ◽  
Sandy To
Keyword(s):  
Sheet Metal ◽  
Crystal Plasticity ◽  
Initial Imperfection ◽  
Rate Sensitivity ◽  
Alloy Sheet ◽  
Forming Limits ◽  
Factors Affecting ◽  
Rate Dependent ◽  
Initial Texture ◽  
Process Factors

A rate-dependent crystal plasticity constitutive model together with Marciniak- Kuczynski(M-K) approach is employed to perform numerical simulations of forming limits diagrams(FLDs). An initial imperfection in terms of a narrow band is adopted to initialize the sheet necking. Homogeneous deformations inside and outside the band are assumed and the enforcement of compatibility and equilibrium conditions is required only on the band interface. Constitutive computations are carried out on two aggregates of FCC crystal grains, with each representing one of the two zones, respectively. Taylor homogenization assumption is employed to establish the link of stress between single crystal and polycrystal, and to derive an average response of the aggregates. The same initial texture is imparted to the two aggregates and their evolutions will be traced in the necking process. Factors affecting the FLDs prediction, such as imperfection intensity, initial texture, strain rate sensitivity and crystal elasticity will be taken into account. The above procedure will be applied to an annealed aluminium alloy sheet metal

Material damage and forming limits of textured sheet metals

2000 ◽  
Vol 99 (1-3) ◽  
pp. 135-140 ◽  
Author(s):  
C.Y. Tang ◽  
W.H. Tai
Keyword(s):  
Material Damage ◽  
Sheet Metals ◽  
Forming Limits

Effect of material damage on forming limits of voided anisotropic sheet metals

2003 ◽  
Vol 34 (6) ◽  
pp. 1283-1290 ◽  
Author(s):  
Young-Suk Kim ◽  
Sung-Yeun Won ◽  
Kyoung-Hoan Na
Keyword(s):  
Material Damage ◽  
Sheet Metals ◽  
Forming Limits
Sign in / Sign up

Export Citation Format

Share Document