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.

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

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%.

Effects of Homogenization-Free on the Microstructures of an Al-Mg-Si-Cu Hot-Rolled Plate for Automotive Pannel

2018 ◽  
Vol 941 ◽  
pp. 1529-1534
Author(s):  
Ni Tian ◽  
Qi Long Liu ◽  
Zi Yan Zhao ◽  
Gang Zhao ◽  
Kun Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Aluminum Alloy ◽  
Rolling Direction ◽  
Rolled Plate ◽  
Alloy Plate ◽  
Solution Treated ◽  
Aluminum Alloy Plate ◽  
Hot Rolled ◽  
Scanning Electron

The microstructure of Al-1.01Mg-1.11Si-0.38Cu-0.69Mn aluminum alloy plate hot-rolled from homogenization and homogenization-free ingots were investigated by optical microscopy and scanning electron microscopy assisted with energy dispersive spectroscopy (SEM/EDS). The results showed that there are 3 main kinds of constituents such as Mg2Si, AlCuMgSi and AlFeMnSi in the as-cast Al-1.01Mg-1.11Si-0.38Cu-0.69Mn aluminum alloy ingot. After homogenization treated at 545°C for 24h, the black Mg2Si and the white bright AlCuMgSi particles in the ingot dissolved into matrix, but the grey AlFeMnSi phase partly dissolved, contracted into sphere and become coarse, many ultrafine dispersoids appear in the dendritic arms. The constituents in the plates hot-rolled from the homogenization and homogenization-free ingots are both distributed as broken chains along the rolling direction. However, compared with the particles configuration in the plate that hot-rolled from homogenization ingot, the particles in the plate that hot-rolled from the homogenization-free ingot are finer, more numerous and more homogenous, and with insufficient recrystallization when the plates are solution treated at 545°C for 2 h and then water quenched.

Effect of Split-Sleeve Cold Expansion on the Fatigue Life of 7050-T7451 Aluminum Alloy

2014 ◽  
Vol 1082 ◽  
pp. 403-407 ◽  
Author(s):  
Hong Huang ◽  
Qing Yun Zhao ◽  
Feng Lei Liu
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Residual Stresses ◽  
Transgranular Fracture ◽  
Alloy Plate ◽  
Cold Expansion ◽  
Compressive Stresses ◽  
Aluminum Alloy Plate ◽  
Relationship Of ◽  
The Relationship

Split-sleeve cold expansion processing was employed on the 7050-T7451 aluminum alloy plate. Fatigue lives were compared according different expansion, then the relationship of fatigue life and expansion was analyzed. Residual stresses were measured with different expansion, and the fatigue fractograph was analyzed by SEM. The results show that the split-sleeve cold expansion can obtain longer life compared with the non-strengthen hole. When over the optimum expansion, fatigue life began to decrease. The maximum fatigue life increased to 2.92 times with 4.1% expansion. The maximum values of radial residual stresses grew with expansion. The depths of residual compressive stresses were more than 6mm with 2.6% and 4.1% expansion. The fatigue fractograph shows mixed transgranular fracture.

XRD Residual Stress and Texture Analysis on 6082T Aluminum Alloy

2021 ◽  
Vol 1028 ◽  
pp. 409-414
Author(s):  
Maykel Manawan ◽  
Sovian Aritonang ◽  
Mas Ayu Elita Hafizah ◽  
Antonius Suban Hali ◽  
Nono Darsono ◽  
...  
Keyword(s):  
Residual Stress ◽  
Shear Stress ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Stress Analysis ◽  
Texture Analysis ◽  
Transverse Direction ◽  
Rolling Direction ◽  
Residual Stress Analysis

The determination of residual stresses is of great importance for many threated metal applications. In this work, the XRD residual stress analysis was used to characterized tempered aluminum-based specimen 6082T with rotation angles (phi) 0°, 45° and 90°, respectively. Highest stress levels were found in the rolling direction (phi = 0°), while negligible along transfers direction (phi = 90°). In addition, a shear stress along rolling and transverse direction, and also the present of texture along (110) can be observed.

820 Residual Stresses in V Shape Bended 6000 Series Aluminum Alloy Plate

2014 ◽  
Vol 2014.51 (0) ◽  
pp. _820-1_-_820-2_
Author(s):  
Tomohiro Okizaki ◽  
Takashi Kawakami ◽  
Takahiro Kinoshita ◽  
Atsuhiro Matsuura
Keyword(s):  
Aluminum Alloy ◽  
Residual Stresses ◽  
Alloy Plate ◽  
Series Aluminum Alloy ◽  
Aluminum Alloy Plate

Residual Stress Analysis in Quenched Aluminum Alloy Plate Using the Contour Method

2016 ◽  
Vol 850 ◽  
pp. 167-174 ◽  
Author(s):  
Ya Nan Li ◽  
Yong An Zhang ◽  
Xi Wu Li ◽  
Zhi Hui Li ◽  
Guo Jun Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Tensile Stress ◽  
Residual Stresses ◽  
Experimental Measurement ◽  
Fem Simulation ◽  
Finite Element Method Simulation ◽  
Maximum Tensile Stress ◽  
Contour Method ◽  
Alloy Plate

A plate (30mm thick) of aluminum alloy 7085-T76 was quenched into water at room temperature after solution treated at 470°C. The quenching residual stresses distributions were studied by both experimental measurement and FEM (Finite Element Method) simulation. The experimental measurement was accomplished by using the contour method, and the FEM simulation was carried out to verify the experimental results. The experimental quenching residual stress distributions showed the tensile stresses of 74.8MPa ~109MPa in the center part, and compressive stresses of 29MPa-63.6MPa on the surface. The prediction distributions showed the maximum tensile stress of 98.2MPa in the center and the maximum compressive stress of 50.5MPa on the surface. The experimental quenching residual stresses distributions agree favorably with the prediction results. The deviations of the maximum tensile stress were less than 25MPa in the center. The deviations may be attributed to the accuracy of the contour method and the idealization of the prediction model.

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