Finite Element Simulation of Effects of Mould Angle and Friction on ECAP for AZ80 Magnesium Alloy

2010 ◽  
Vol 667-669 ◽  
pp. 81-86 ◽  
Author(s):  
Gang Yi Cai ◽  
Xiao Ting Huang ◽  
Shi Xing Zhang
Keyword(s):  
Finite Element ◽  
Magnesium Alloy ◽  
Friction Coefficient ◽  
Finite Element Simulation ◽  
Effective Strain ◽  
Large Angle ◽  
Maximum Load ◽  
Steady Stage ◽  
Element Simulation ◽  
Az80 Magnesium Alloy

Finite element simulation of the effects of mould angle and friction condition on the equal channel angular pressing (ECAP) for AZ80 magnesium alloy were investigated by using DEFORM-3D program. The results show that the curve of load-displacement was divided into several stages including rapid increasing stage, load fluctuation, rapid increasing stage, steady stage and rapid drop stage. Firstly, when the angle decreased from 150°to 90°, the maximum load increased, and the same as energy consuming. In addition, the average effective strain increased with the decreasing of mould angle after single extrusion, while the degree of effective strain uniformity of the sample decreased and keep greater strain grads between inner and surface part. Secondly, the work load ascended with the increasing of the friction coefficient from 0 to 0.3, and one part of load overcome the friction and the other part is used for deformation of the sample. With the increment of friction coefficient, the average effective strain keeps steady value, while the degree of effective strain uniformity of the sample decreased. As mentioned above, large angle mould and low coefficient of friction should be adopted during ECAP deformation for AZ80 magnesium alloy.

Finite Element Simulation of the Effects of Mould Angle on the Equal Channel Angular Pressing for Al-Zn-Mg-Cu Alloy

2010 ◽  
Vol 97-101 ◽  
pp. 3075-3078
Author(s):  
Gang Yi Cai ◽  
Xiao Xia Liu
Keyword(s):  
Finite Element ◽  
Aluminum Alloy ◽  
Finite Element Simulation ◽  
Equal Channel Angular Pressing ◽  
Effective Strain ◽  
Large Angle ◽  
Maximum Load ◽  
Angular Pressing ◽  
Steady Stage ◽  
Element Simulation

Finite element simulation of the effects of mould angle on the equal channel angular pressing (ECAP) for Al-Zn-Mg-Cu aluminum alloy was investigated by using DEFORM-3D program. The results show that the work load ascended with the increasing of the mould angle and was divided into five stages including rapid increasing stage, steady stage, rapid increasing stage, steady stage and rapid drop stage. When the angle decreased from 150° to 90°, the maximum load increased by 2.87 times and the energy consuming increased by 2.36 times. In addition, with the decreasing of mould angle, the average effective strain increased after single extrusion, while the degree of effective strain uniformity of the sample decreased. There were greater strain grads between inner and surface part. As mentioned above, large angle mould should be adopted on ECAP for Al-Zn-Mg-Cu aluminum alloy in order to ensure extrusion smoothly and attain homogeneous fine grain.

Finite Element Simulation of Rotating Compression Forming

2018 ◽  
Vol 920 ◽  
pp. 22-27
Author(s):  
Yeong Maw Hwang ◽  
K.S. Jhuang ◽  
Hao Cheng Yu
Keyword(s):  
Grain Size ◽  
Finite Element ◽  
Magnesium Alloy ◽  
Effective Strain ◽  
Hardness Measurement ◽  
Compression Pressure ◽  
Element Simulation ◽  
Plastic Deformation Behavior ◽  
Gradient Microstructure ◽  
Grain Size Distributions

In this study, finite element analyses of Rotating Compression Forming (RCF) of magnesium alloy AZ31 with 20mm in diameter are carried out. A commercial software DEFORM-3D is used to simulate the plastic deformation behavior of magnesium alloy during rotating compression forming processes. Various forming parameters, such as the compression pressures (55, 60, 62 MPa), rotation speeds (10, 20, 30 rpm), rotation numbers (10, 20, 30 revolutions) and forming temperatures (280°C, 320°C, 360°C), are used in the FE simulation to obtain different effective strain distributions. Observation of the gradient microstructure and hardness measurement in the specimens of Magnesium alloy are carried out. From the comparisons of effective strain distributions and the obtained grain size distributions. It is known that a larger effective strain corresponds to a smaller grain size and the maximum effective strain is occurred at the middle of the contact plane of the specimen. Larger effective strain gradients generated with compression pressure of 62 MPa and rotation number of 30 revolutions at the radius of 4 mm.

Influence of Processing Parameters on Cobonding-Induced Deformation of Composite Panel with “I”-Shape Stiffener

2015 ◽  
Vol 1089 ◽  
pp. 341-345
Author(s):  
Xue Qin Li ◽  
Zi Long Zhang
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Finite Element Simulation ◽  
Processing Parameters ◽  
Composite Panel ◽  
Composite Panels ◽  
Consolidation Pressure ◽  
Element Simulation ◽  
Warpage Deformation

Composite panels with “I”-shape stiffeners are widely used, but cobonding process induces large warpage deformation after demoulding. Finite element simulation was used in this paper to analyze the effects of some representative processing parameters on the process-induced deformation. The results show that the deformation increases with the consolidation pressure, the CTE of mould and the friction coefficient. The deformation is more sensitive to the consolidation pressure and the friction coefficient for a shorter part, while it is more sensitive to the CTE of mould for a longer part.

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