Numerical Simulation of Pore Evolution of 7050 Aluminum Alloy during Hot Compression Process

2016 ◽  
Vol 879 ◽  
pp. 2119-2124
Author(s):  
Yong Fu Wu ◽  
Hui Xue Jiang ◽  
Chun Zou ◽  
Kang Cai Yu ◽  
Hiromi Nagaumi
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Flow Stress ◽  
Hot Compression ◽  
Compression Process ◽  
Bulk Metal ◽  
Inner Pressure ◽  
7050 Aluminum Alloy ◽  
Pore Evolution ◽  
Evolution Behavior

Evolution behavior of pores in 7050 aluminum alloy during hot compression process has been investigated by finite element (FE) numerical simulation. The representative volume element (RVE) model containing one isolated pore is built, in which the gas in pore is treated as ideal gas. Effects of initial pore inner pressure and deformation temperature on pore evolution have been investigated. The simulation results indicate that stress concentration exists around the pore in the compressing process. At the simple compression condition, the inner pressure of the pore increases but the volume decreases as the bulk metals deforms. However, the volume reaches a plateau after the yield point of bulk metal. The plateau volume depends on the initial inner pressure of the pore and the flow stress of the bulk metal. Since the inner pressure of the pore balances with the flow stress of bulk metal at the interface, the temperature affects the evolution behavior of the pore through its influence on the flow stress of the bulk metal primarily.

Numerical Simulation of Fatigue Life of 7050 Aluminum Alloy Processed by Laser Shock Processing

2010 ◽  
Vol 37 (12) ◽  
pp. 3192-3195 ◽  
Author(s):  
张洁 Zhang Jie ◽  
顾祥 Gu Xiang ◽  
祝乐 Zhu Le ◽  
孙爱华 Sun Aihua
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Fatigue Life ◽  
Laser Shock ◽  
Laser Shock Processing ◽  
7050 Aluminum Alloy ◽  
Shock Processing

The Flow Stress Feature and Constitutive Equation of 6016 Aluminum Alloy during Hot Compression

2012 ◽  
Vol 538-541 ◽  
pp. 1687-1692
Author(s):  
Ji Xiang Zhang ◽  
Wei Feng ◽  
Hui Wen ◽  
Guo Yin An
Keyword(s):  
Aluminum Alloy ◽  
Flow Stress ◽  
Linear Regression ◽  
Constitutive Equation ◽  
Strain Rate ◽  
Strain Rate Range ◽  
Thermal Simulation ◽  
Hot Compression ◽  
Rate Range ◽  
6016 Aluminum Alloy

The flow stress behavior of 6016 aluminum alloy was investigated on the condition of temperature range from 420°C to 540°C and strain rate range from 0.001s-1to 1s-1based on hot compression experiment on Gleeble-1500 thermal simulation machine. The result shows that the flow stress of 6016 aluminum alloy decreases with the enhancement of temperature and increases with the increase of strain rate. Especially, the flow stress increases tendency becomes obvious when the strain rate greater than 0.1s-1. Based on the results above, a constitutive equation for flow stress of 6016 aluminum alloy when the temperature is above 420°C is obtained by linear regression.

Stress-Strain Behavior of Hot-Compression Mg-Li Alloy

2012 ◽  
Vol 485 ◽  
pp. 283-287
Author(s):  
Jian Bo Wen ◽  
Qian Liu ◽  
Deng Yu Gai
Keyword(s):  
Regression Analysis ◽  
Flow Stress ◽  
Hot Compression ◽  
Compression Process ◽  
Stress Strain ◽  
Arithmetic Average ◽  
Strain Behavior ◽  
Set Up ◽  
Gleeble 3500 ◽  
Gleeble 3500 System

The stress-strain behavior of hot-compression Mg-Li alloy was investigated by using a physical simulator Gleeble-3500 system. And the constitutive equation was set up by regression analysis and BP neural networks. Results show that the dynamic recrystallization occured during the hot-compression process. The grain size of the alloy increased and the stress decreased with increasing temperature. Regression analysis indicates that the flow stress can be expressed by hyperbolic sine model and the arithmetic average of errors is 14.13%. Training the flow stress prediction model with MatLab by an improved BP，the maximum arithmetic average of errors is 4.27%. The predicted stress-strain curves are in good agreement with the experimental results.

Research on Compressive Behavior and Deformation Heating of 7075-T6 Aluminum Alloy during Hot Compression

2014 ◽  
Vol 887-888 ◽  
pp. 315-318
Author(s):  
Dong Ge Wang ◽  
Rui Bin Mei ◽  
Ban Cai ◽  
Chun Li Zhang ◽  
Li Bao ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Flow Stress ◽  
Strain Rate ◽  
Temperature Rise ◽  
Strain Rate Range ◽  
Hot Compression ◽  
Deformation Heating ◽  
Deformation Velocity ◽  
Fluctuation Range ◽  
The Relationship

The flow stress behavior of the 7075-T6 aluminum alloy was studied through single-pass compression experiment by using MMS-300 simulator within temperature range of 300-450°C and strain rate range of 0.01-40s-1. Then a simulation of compression was carried out and the influence of deformation velocity on load and deformation heating was investigated according to the relationship between stress and strain. The results show that dynamic recrystallization occurs in hot compression of 7075-T6 alloy and the stress-strain curves are presented as wave. Furthermore, the flow stress curves have the same wave period and the fluctuation range increases with an increase of strain rate and a decrease of strain. Increasing of deformation velocity results in higher critical strain but the value decreases when the deformation velocity is much higher. The temperature rise increases with the increase of deformation velocity and decrease of deformation temperature. The maximum of temperature rise is more than about 30°C, so that the deformation heating is significant.

Hot Deformation and Processing Map of C919 Aluminum Alloy

2015 ◽  
Vol 816 ◽  
pp. 810-817
Author(s):  
Yong Biao Yang ◽  
Zhi Min Zhang ◽  
Xing Zhang
Keyword(s):  
Aluminum Alloy ◽  
Flow Stress ◽  
Strain Rate ◽  
Hot Deformation ◽  
Testing Machine ◽  
Strain Rate Range ◽  
Hot Compression ◽  
Strain Rates ◽  
Processing Maps ◽  
Compression Tests

The hot deformation behaviors of Aluminum alloy C919 were studied in the present investigation. The hot compression tests for C919 were carried out in the temperature range of 350°C~470°C and strain rates range of 0.001s-1~1s-1 using GLEEBLE-1500 thermal simulate testing machine. Optical microscopy (OM) was used for the microstructure characterization. The experimental results showed that the flow stress of C919 aluminum alloy decreased with increasing temperature and decreasing strain rates and the flow stress curves tended to increase at a strain rate of 1s-1 with increasing strain, while the flow stresses kept with increasing strain at lower strain rate. The alloys were more prone to dynamic recrystallization with decreasing strain rates during hot deformation. The hot compression behavior of C919 aluminum alloy can be described as hyperbolic sine function corrected Arrhenius relation. The processing maps for the alloy were built at a strain of 0.6. The instability deformation domain occurred at temperatures range from 350°C and 380°C and at a strain rate of 0.1-1s-1. Based on the processing maps and microstructure observations, the optimum hot-working parameters were determined to be at a temperature of 470°C in the strain rate range from 0.1-0.01s−1 for the C919 aluminum alloy.

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