scholarly journals Forming Limits Diagram of AZ31 Alloy Sheet with the Deformation Mode

2008 ◽  
Vol 17 (7) ◽  
pp. 473-480 ◽  
Keyword(s):  
Deformation Mode ◽  
Az31 Alloy ◽  
Alloy Sheet ◽  
Forming Limits

Annealing Effects on Mechanical Properties and Microstructure of AZ31 Alloy Sheet Differential-Speed-Rolled at Low Temperatures

2007 ◽  
Vol 558-559 ◽  
pp. 213-216 ◽  
Author(s):  
Y.G. Jeong ◽  
Woo Jin Kim ◽  
Seo Gou Choi ◽  
Ha Guk Jeong
Keyword(s):  
Mechanical Properties ◽  
Tensile Elongation ◽  
Az31 Alloy ◽  
Alloy Sheet ◽  
Large Drop ◽  
High Anisotropy ◽  
Texture Change ◽  
Annealing Effects ◽  
Anisotropy Of Mechanical Properties ◽  
Differential Speed

For the Magnesium alloy AZ31, hot rolling is usually carried out in the temperature range between 250 and 400°C but the processed sheets usually exhibit high anisotropy in mechanical properties. In the current study, DSR process was found to be effective in improving anisotropy of mechanical properties and ductility at room temperature. Full recrystallization takes place from 200°C and above. A large drop of UTS occurs above 200°C where full recrystallization starts. Tensile elongation increases with annealing temperature but anisotropy degrades from 200°C onwards. Texture change during recrystallization is believed to be responsible for this result.

Forming limit analysis of Mg-2Zn-1.2Al-0.2Ca-0.2RE alloy sheet using ductile fracture models

2019 ◽  
Vol 29 (8) ◽  
pp. 1181-1198 ◽  
Author(s):  
Fei-Fan Li ◽  
Gang Fang ◽  
Ling-Yun Qian
Keyword(s):  
Magnesium Alloy ◽  
Ductile Fracture ◽  
Stress Triaxiality ◽  
Forming Limit Diagram ◽  
Alloy Sheet ◽  
Image Correlation ◽  
Forming Limit ◽  
Correlation Technique ◽  
Forming Limits ◽  
Fracture Models

This work was aimed to experimentally and theoretically investigate the formability of a new magnesium alloy sheet at room temperature. The fracture forming limit diagram was predicted by MMC3 and DF2014 models, where the non-linear strain path effect was taken into account by means of damage accumulation law. In order to obtain the instantaneous values of the stress triaxiality and the Lode parameter during the deformation process, strains tracked by digital image correlation technique were transformed into stresses based on the constitutive equations. The fracture forming limit diagram predicted by the fracture models was compared with the forming limits obtained by ball punch deformation tests. The prediction errors were evaluated by the accumulative damage values, which verified the advantages of ductile fracture models in predicting the forming limits of the magnesium alloy sheets.

An incremental-update formulation to simulate earing behaviour with crystal plasticity model

2011 ◽  
Vol 225 (8) ◽  
pp. 1774-1781 ◽  
Author(s):  
S Zhang ◽  
S Huang ◽  
D Li ◽  
Y Peng
Keyword(s):  
Crystal Plasticity ◽  
Deformation Behaviour ◽  
Az31 Alloy ◽  
Alloy Sheet ◽  
Plasticity Model ◽  
Explicit Finite Element ◽  
Rate Dependent ◽  
Crystal Plasticity Model ◽  
Finite Element Package ◽  
Incremental Update

To gain a better understanding about the influence of initial texture on deformation behaviour of sheet metals, an incremental-update formulation is adopted for implementing rate-dependent crystal plasticity model into the explicit finite element package, ABAQUS/Explicit. In this formulation, the configuration in the last increment serves as a reference frame, and the stress, grain orientation and hardening behaviour of crystal are updated at the end of each increment. Two user subroutines VUMAT are developed, respectively, for face-centred cubic and hexagonal close packed alloys due to different deformation mechanisms. Earing behaviours of aluminium sheet and AZ31 alloy sheet are simulated for model validation.

1608 Effect of Aspect Ratio and Direction on Mechanical Property for AZ31 Alloy Sheet

2011 ◽  
Vol 2011.49 (0) ◽  
pp. 495-496
Author(s):  
Taku Hosoya ◽  
Tetsuo NAKA ◽  
Takeshi UEMORI ◽  
Fusahito YOSHIDA ◽  
Masahide KODU ◽  
...  
Keyword(s):  
Mechanical Property ◽  
Aspect Ratio ◽  
Az31 Alloy ◽  
Alloy Sheet

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

Effect of the final rolling speeds on the stretch formability of AZ31 alloy sheet rolled at a high temperature

2015 ◽  
Vol 650 ◽  
pp. 436-443 ◽  
Author(s):  
Tao Zhou ◽  
Zhao Yang ◽  
Dong Hu ◽  
Tao Feng ◽  
Mingbo Yang ◽  
...  
Keyword(s):  
High Temperature ◽  
Az31 Alloy ◽  
Alloy Sheet ◽  
Stretch Formability ◽  
Final Rolling
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