Development of Multi-Scale Thermo-Crystal Plasticity Finite Element Method to Analyze Plastic Deformation of Magnesium Alloy

2017 ◽  
Author(s):  
Sayuki Kashiwagi ◽  
Yoshihiro Tomita ◽  
Toshihiko Yamaguchi ◽  
Koji Yamamoto ◽  
Yusuke Morita ◽  
...  
Keyword(s):  
Finite Element ◽  
High Temperature ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Crystal Plasticity ◽  
Texture Evolution ◽  
Fe Analysis ◽  
Numerical Code ◽  
Multi Scale ◽  
Crystal Texture

To clarify the deformation induced crystal texture evolution of rolled and drawn magnesium alloy sheets with strong basal texture, we developed a multi-scale finite element (FE) analysis code based on the homogenization theory, which combines the microscopic poly-crystal structure and the macroscopic continuum. In our crystal plasticity constitutive equation of magnesium alloys, the plastic work induced temperature rise and twinning in the crystal slip systems was implemented into our multi-scale FE analysis code. To validate our numerical code to correctly predict macro and micro deformations including the crystal texture evolution, the tension and compression along normal direction (ND) and rolling direction (RD) at the room temperature 300K and the high temperature 673K were numerically investigated. It is confirmed that numerical results showed the similar tendency to experimentally obtained results including the strengthening the basal texuture in compression along ND, the twinning, the polarity of twinning and the temperature-dependency that twinning is hardly appear at high temperature. Finaly, we concluded that our numerical code can predict the plastic strain induced texture evolution of magnesium alloys.

Simulation of Earing during Deep Drawing of bcc Steel by Use of a Texture Component Crystal Plasticity Finite Element Method

2005 ◽  
Vol 495-497 ◽  
pp. 1529-1534 ◽  
Author(s):  
Dierk Raabe ◽  
Franz Roters ◽  
Yan Wen Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Crystal Plasticity ◽  
Texture Component ◽  
Numerical Study ◽  
Texture Evolution ◽  
Plastic Anisotropy ◽  
Crystal Plasticity Finite Element ◽  
Cup Drawing ◽  
Element Method

We present a numerical study on the influence of crystallographic texture on the earing behavior of a low carbon steel during cup drawing. The simulations are conducted by using the texture component crystal plasticity finite element method which accounts for the full elastic-plastic anisotropy of the material and for the explicit incorporation of texture including texture update. Several important texture components that typically occur in commercial steel sheets were selected for the study. By assigning different spherical scatter widths to them the resulting ear profiles were calculated under consideration of texture evolution. The study reveals that 8, 6, or 4 ears can evolve during cup drawing depending on the starting texture. An increasing number of ears reduces the absolute ear height. The effect of the orientation scatter width (texture sharpness) on the sharpness of the ear profiles was also studied. It was observed that an increase in the orientation scatter of certain texture components entails a drop in ear sharpness while for others the effect is opposite.

scholarly journals A Study on Designing Balloon Expandable Magnesium Alloy Stent for Optimization of Mechanical Characteristics

Proceedings ◽  
2018 ◽  
Vol 2 (8) ◽  
pp. 523
Author(s):  
Ichiro Shimizu ◽  
Akira Wada ◽  
Makoto Sasaki
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
Study Design ◽  
Mechanical Characteristics ◽  
Design Parameters ◽  
Optimized Design ◽  
Element Analysis ◽  
Biodegradable Properties

Recently, the demand for a bio-absorbable coronary stent to promote recovery after an operation has increased. An option for such a stent is one made of a magnesium alloy, which has biodegradable properties. However, magnesium alloys have lower rigidity and lower ductility than other metals; as such, an appropriate stent structure is required to ensure radial rigidity. In this study, design parameters for an AZ31 magnesium alloy stent with sufficient radial rigidity were investigated. The necessary radial rigidity was determined by comparison tests against commercially available stents. The design parameters of the cell struts were selected and the optimum values to achieve high radial rigidity were investigated by means of elastic–plastic finite element analysis. Finally, a trial model stent based on the optimized design parameters was produced. It was confirmed that the model had sufficient radial rigidity, with no fracturing evident during crimping and expansion processes.

Simulation of Temperature Field during Semi-Solid Magnesium Alloy Produced by Casting-Rolling Technology

2008 ◽  
Vol 141-143 ◽  
pp. 671-676
Author(s):  
Song Yang Zhang ◽  
Mao Peng Geng ◽  
Shui Sheng Xie
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Temperature Field ◽  
High Temperature ◽  
Magnesium Alloy ◽  
Experimental Results ◽  
Temperature Fields ◽  
Semi Solid ◽  
Rolling Technology ◽  
Element Method

The temperature fields during semi-solid magnesium alloy produced by casting-rolling technology has been simulated by finite element method on the basis of ANSYS. The temperature fields for different conditions were obtained, which is consistent with the experimental results. Results show that there is a high temperature field in the casting and rolling zone. The temperature fluctuates from the center to edge of the strip near the entry of the casting and rolling zone. but The temperature decreases gradually from the center to edge of the strip near the exit of the casting and rolling zone. There are some remarkable effects of the temperature of the casting and rolling, the velocity of the casting and rolling, the gap of two roll, the cooling of the roll and the diameter of the roll on the temperature field, which are in agreement with the experimental results.

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