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.

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.

Study on the Residual Stresses Distribution in Thick Pre-Stretched Aluminum Plate

2018 ◽  
Vol 764 ◽  
pp. 49-57
Author(s):  
Hun Guo ◽  
Dun Wen Zuo ◽  
Fei Hong Yin ◽  
Ya Feng He ◽  
Ji Xu ◽  
...  
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Quantitative Analysis ◽  
Residual Stresses ◽  
Thick Plate ◽  
Engineering Application ◽  
Machining Distortion ◽  
Stress Strain Relation ◽  
Measurement Results ◽  
Aluminum Plates

It is one of the difficult problems in the manufacture of the integrated aircraft part of Machining distortion caused by residual stress. According to the characteristics of aluminum alloy pre stretched thick plate, the modified removal method for measuring residual stress in thick pre-stretched aluminum plates is proposed and the stress-strain relation matrix is deduced by elasticity theory. Moreover, the residual stresses in the specimen of 7075T7351 plate is measured by the proposed method, and the results are finally analyzed and compared with the data obtained by other methods. The results indicate that the proposed method is effective in measuring the residual stress in thick pre-stretched aluminum alloy plates. The measurement results can be used for the quantitative analysis of aerospace parts machining distortion caused by residual stress, and it has higher value in engineering application.

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.

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.

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

Analysis of the Milling Distortion due to Residual Stress Based on Analytical Method

2010 ◽  
Vol 33 ◽  
pp. 88-91
Author(s):  
Yuan Wei Liu
Keyword(s):  
Residual Stress ◽  
Elasticity Theory ◽  
Analytical Method ◽  
Milling Process ◽  
Theory Theory ◽  
Machining Distortion

Formulae of stress re-distribution and distortion by stress releasing during milling process are deduced by elasticity theory. 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.

Sign in / Sign up

Export Citation Format

Share Document