Residual stress relief of welded aluminum alloy plate using ultrasonic vibration

Ultrasonics ◽  
2020 ◽  
Vol 107 ◽  
pp. 106164
Author(s):  
Qinglong Zhang ◽  
Lei Yu ◽  
Xiaofeng Shang ◽  
Su Zhao
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Ultrasonic Vibration ◽  
Stress Relief ◽  
Alloy Plate ◽  
Aluminum Alloy Plate

A Mathematical Model for Predicting Residual Stresses in Pre-Stretched Aluminum Alloy Plate

2010 ◽  
Vol 97-101 ◽  
pp. 3187-3193 ◽  
Author(s):  
Shu Yuan Zhang ◽  
Yun Xin Wu
Keyword(s):  
Mathematical Model ◽  
Residual Stress ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Rolling Direction ◽  
Stress Relief ◽  
Published Data ◽  
Alloy Plate ◽  
Stress Theory ◽  
Aluminum Alloy Plate

A mathematical model has been developed to predict the residual stresses level in pre-stretched aluminum alloy plate. This is based on force balances of the residual stress, theory of plastoelasticity and a new conception of free length. The model is relatively simple because only rolling direction residual stress is taken into account, but provides a clear illustration of stress relief mechanism in stretching process. With this model, residual stress distributions of stretched beam can be determined directly by knowing the specimen dimensions, material properties and the original stress. The model offers an useful tool to show the effect of varying tension ratio on the final residual stress level, thus makes it possible to predict stress relief and control residual stresses. An example of using the model is presented by applying published data while showing mechanism of stress relief during stretching. Analysis indicates that it is stretch-caused convergence of the free lengths of strips in beam that lead to reduction in the residual stresses.

Influences of Initial Residual Stresses on Milling Distortion for Thick Aero-Aluminum-Alloy Plate

2011 ◽  
Vol 381 ◽  
pp. 44-47
Author(s):  
Hun Guo ◽  
Dun Wen Zuo ◽  
Guo Xing Tang ◽  
W.M. Gan
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Analytical Method ◽  
Milling Process ◽  
Alloy Plate ◽  
Machining Distortion ◽  
Aluminum Alloy Plate

Formulae of stress re-distribution and distortion by stress releasing during milling process are deduced to Initial Residual Stresses. Theory prediction of milling deformation due to residual stress is finished, and some calculating equation is given for the deformation solution. By means of these researches, the mechanism of the milling deformation due to residual stress is analyzed, the machining distortion caused by residual stress are analyzed and summarized using the analytical method.

Numerical Simulation of Quenching and Pre-Stretching Residual Stress in 7085 Aluminum Alloy Plate

2016 ◽  
Vol 852 ◽  
pp. 211-217
Author(s):  
Hai Long Cao ◽  
Xi Wu Li ◽  
Ya Nan Li ◽  
Hong Wei Yan ◽  
Zhi Hui Li ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Stress Reduction ◽  
Transverse Direction ◽  
Rolling Direction ◽  
Reduction Ratio ◽  
Alloy Plate ◽  
Aluminum Alloy Plate ◽  
Simulation Results ◽  
Stress Simulation

The finite element method (FEM) was used to study the quenching and pre-stretching residual stresses of the 7085 aluminum alloy plate, combining with experimental measurement. Quenching residual stress simulation results showed that the stress of the rolling-direction and transverse-direction in the center were 16.5MPa and 9.2MPa, respectively. The stress of the rolling-direction and transverse-direction on the surface were-33.8MPa and-40.4MPa, respectively. The quenching residual stress simulation results were in good agreement with the X-ray diffraction experimental results. As the pre-stretching ratio increases, the quenching residual stress reduction ratio increases. The ratio of 2.0~3.0% pre-stretching can effectively release the quenching residual stress in aluminum alloy plates. After 3.0% pre-stretching, the stress of the rolling-direction and transverse-direction in the center were 0.9MPa and 1.8MPa, respectively. The stress of the rolling-direction and transverse-direction on the surface were-3.6MPa and-7.1MPa, respectively. The quenching residual stress reduction ratio reached above 80%.

Investigation of Fatigue Growth Behavior of an Inclined Crack in Aluminum Alloy Plate

2018 ◽  
Vol 18 (5) ◽  
pp. 1159-1167 ◽  
Author(s):  
Jun Wang ◽  
Xing-Quan Zhang ◽  
Wei Wei ◽  
Jin-Yu Tong ◽  
Bin Chen ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Growth Behavior ◽  
Inclined Crack ◽  
Alloy Plate ◽  
Aluminum Alloy Plate
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