Identification of strain-rate-dependent hardening model for aluminium alloy sheet in electromagnetic forming

2021 ◽  
Vol 1 (1) ◽  
pp. 1
Author(s):  
Shoulu Zhou ◽  
Zhenghua Meng ◽  
Yangzhe Lin ◽  
Zhigang Xu ◽  
Wei Liu
Keyword(s):  
Strain Rate ◽  
Aluminium Alloy ◽  
Alloy Sheet ◽  
Electromagnetic Forming ◽  
Hardening Model ◽  
Rate Dependent

Electromagnetic forming of aluminium alloy sheet

2003 ◽  
Vol 110 ◽  
pp. 293-298 ◽  
Author(s):  
D. A. Oliveira ◽  
M. Worswick
Keyword(s):  
Aluminium Alloy ◽  
Alloy Sheet ◽  
Electromagnetic Forming

Tensile Behaviour of 6082 Aluminium Alloy Sheet under Different Conditions of Heat Treatment, Temperature and Strain Rate

2009 ◽  
Vol 423 ◽  
pp. 105-112 ◽  
Author(s):  
I. Torca ◽  
A. Aginagalde ◽  
J.A. Esnaola ◽  
L. Galdos ◽  
Zigor Azpilgain ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Strain Rate ◽  
Aluminium Alloy ◽  
Aluminium Alloys ◽  
Room Temperature ◽  
Microstructural Analysis ◽  
Weight Ratio ◽  
Alloy Sheet ◽  
Treatment Temperature ◽  
Tensile Behaviour

Aluminium alloys are more and more important for the automotive industry due to their high strength to weight ratio and their elevated ductility; they are used for many different parts in automobiles as exterior panels, structural parts, brake housings and others. However, their formability at room temperature is limited. This inconvenient can be improved by increasing the forming temperature of the part. That lack of formability has lead to this research project dealing with the tensile behaviour of aluminium alloys sheets, at different conditions of temperature and strain rate. The analyzed material has been 6082 aluminium alloy, under two different heat treatment conditions (O and T6). Material testing has been carried out in a temperature range between room temperature and 250°C, and a strain rate range between 0.001s-1 and 0.1s-1. Testing samples have been obtained from laminated sheet of 1.5mm thickness. This article shows that the alloy under T6 condition has a reduced formability, even in warm conditions. In order to get higher deformation values an annealed condition is proposed to form the material. The effect of T6 heat treatment and O annealing treatment in the uniaxial warm formability is discussed and a microstructural analysis is also presented in order to understand the differences on the alloy behaviour.

Constitutive Modeling of the Rate-Dependent Behavior of Ti-6Al-4V Using an Arrhenius-Type Law

2012 ◽  
Vol 591-593 ◽  
pp. 949-954
Author(s):  
Jun Jie Xiao ◽  
Dong Sheng Li ◽  
Xiao Qiang Li ◽  
Chao Hai Jin ◽  
Chao Zhang
Keyword(s):  
Flow Stress ◽  
Strain Rate ◽  
Tensile Tests ◽  
Alloy Sheet ◽  
Uniaxial Tensile ◽  
Thin Wall ◽  
Rate Dependent ◽  
Hot Environment ◽  
Dependent Behavior ◽  
Element Simulation

Uniaxial tensile tests were performed on a Ti-6Al-4V alloy sheet over the temperature range of 923K-1023K with the strain rates of 5×10-4s-1-5×10-2s-1 up to a 25% length elongation of the specimen. The true stress-strain curves reveal that the flow stress decreases with the increase of the temperature and the decrease of the strain rate. In the same process, the accompanying softening role increases. It is found that the Ti-6Al-4V shows the features of non-linearity, temperature sensitivity and strain rate dependence in hot environment. Finally, an Arrhenius-type law has been established to predict the experimental data and the prediction precision was verified by the plotting of parameter and flow stress, which revealed that the error of stress exponent was only 4.99%. This indicates the flow stress model has high precision and can be used for the process design and the finite element simulation of hot forming thin-wall Ti-6Al-4V alloy components.

Comparing Two Selection Laws of Active Slip Systems in Finite Element Polycrystalline Model for Numerical Material Testing

2018 ◽  
Vol 920 ◽  
pp. 169-174
Author(s):  
Shin Onoshima ◽  
Tetsuo Oya
Keyword(s):  
Strain Rate ◽  
Crystal Orientation ◽  
Integration Method ◽  
Tensile Tests ◽  
Material Testing ◽  
Alloy Sheet ◽  
Material Models ◽  
Rate Dependent ◽  
Dependent Model ◽  
Polycrystalline Model

To meet the demand for high accuracy in metal forming simulation including difficult problems such as anisotropy, many material models have been developed. Since the recent material models usually possess many parameters and require cumbersome experiments, a reliable numerical material testing would be helpful to reduce the number of experiments. Therefore, we have engaged in development of a numerical material testing based on the finite element polycrystalline model in which the successive integration method is used for modeling slip systems. However, implementation based on the strain-rate dependent model, which is considered as the mainstream of such model, has not been rigorously considered in our research. In this study, two polycrystalline models were compared to establish better microstructural modeling for constructing a scheme of numerical material testing to predict material behavior that is not obtained by experiments. Numerical rolling, uniaxial tensile tests were conducted on aluminum alloy sheet with the strain-rate dependent model and the successive integration method. The crystal orientation calculated by the successive integration method exhibited close agreement with the experimental value of the rolled aluminum alloy sheet. On the other hand, the calculated crystal orientation by the strain-rate dependent model exhibited less close agreement with the experimental value of the same material than the successive integration method. To ascertain the characteristics of each model in terms of slip deformation quantitatively, the other tensile tests were conducted to calculate Lankford values caused by crystal orientation. Lankford values, calculated by the successive integration method, exhibited better agreement with experimental values than the strain-rate dependent model. These comparisons indicate that the successive integration method represented slip deformation more physically valid than the strain-rate dependent model and resulted in better calculation.

scholarly journals A strain rate dependent anisotropic hardening model and its validation through deep drawing experiments

2013 ◽  
Vol 7 (4) ◽  
pp. 447-457 ◽  
Author(s):  
Philip Peters ◽  
Niko Manopulo ◽  
Christian Lange ◽  
Pavel Hora
Keyword(s):  
Strain Rate ◽  
Deep Drawing ◽  
Anisotropic Hardening ◽  
Hardening Model ◽  
Rate Dependent
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