Anisotropic yield function of sheet forming simulation for aluminum alloy by using commercial FEM software “LS-DYNA V950"

2003 ◽  
Vol 105 ◽  
pp. 47-52
Author(s):  
K. Yamada ◽  
H. Mizukoshi ◽  
K. Okada ◽  
N. Ma ◽  
N. Sugitomo
Keyword(s):  
Aluminum Alloy ◽  
Yield Function ◽  
Sheet Forming ◽  
Forming Simulation ◽  
Anisotropic Yield Function

Topology Optimization of Blank Geometry for the Sheet Forming Process

2012 ◽  
Author(s):  
Saber DorMohammadi ◽  
Mohammad Rouhi ◽  
Masoud Rais-Rohani
Keyword(s):  
Topology Optimization ◽  
Volume Fraction ◽  
Structural Response ◽  
Sheet Forming ◽  
Forming Process ◽  
Exchange Method ◽  
Forming Simulation ◽  
Blank Shape Optimization ◽  
Blank Shape ◽  
Consistent Subset

The newly developed element exchange method (EEM) for topology optimization is applied to the problem of blank shape optimization for the sheet-forming process. EEM uses a series of stochastic operations guided by the structural response of the model to switch solid and void elements in a given domain to minimize the objective function while maintaining the specified volume fraction. In application of EEM to blank optimization, a sheet forming simulation model is developed using Abaqus/Explicit. With the goal of minimizing the variability in wall thickness of the formed component, a subset of solid (i.e., high density) elements with the highest increase in thickness is exchanged with a consistent subset of void (i.e., low density) elements having the highest decrease in thickness so that the volume fraction remains constant. The EEM operations coupled with finite element simulations are repeated until the optimum blank geometry (i.e., boundary and initial thickness) is found. The developed numerical framework is applied to blank optimization of a benchmark problem. The results show that EEM is successful in generating the optimum blank geometry efficiently and accurately.

Study on contact algorithm of dynamic explicit FEM for sheet forming simulation

2001 ◽  
Vol 6 (3) ◽  
pp. 704-708
Author(s):  
Zhang Hai-ming ◽  
Dong Xiang-huai ◽  
Li Zhi-gang
Keyword(s):  
Sheet Forming ◽  
Forming Simulation ◽  
Contact Algorithm

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.

A Yield Function for Anisotropic Sheet Material Described by 3rd-Degree Spline Curve and its Applications

2016 ◽  
Vol 725 ◽  
pp. 653-658 ◽  
Author(s):  
Toshiro Aamaishi ◽  
Hideo Tsutamori ◽  
Eiji Iizuka ◽  
Kentaro Sato ◽  
Yuki Ogihara ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Mild Steel ◽  
Plane Stress ◽  
Sheet Material ◽  
Yield Function ◽  
Sheet Metals ◽  
Anisotropic Behavior ◽  
Spline Curve ◽  
Series Aluminum Alloy

A new plane stress yield function using the 3rd-degree spline curve is proposed for the anisotropic behavior of sheet metals. This yield function considers the evolution of anisotropy in terms of both r values and stresses. In order to demonstrate the applicability of the proposed yield function, hole expanding tests with mild steel and 6000 series aluminum alloy sheets were simulated.

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