Study on Residual Stresses in Milling Aluminium Alloy 7050-T7451

2008 ◽  
pp. 169-178 ◽  
Author(s):  
Z. T. Tang ◽  
Z. Q. Liu ◽  
Y. Wan ◽  
X. Ai
Keyword(s):  
Residual Stresses ◽  
Aluminium Alloy ◽  
Aluminium Alloy 7050

Surface Modification Analysis after Shot Peening of AA 7075 in Different States

2013 ◽  
Vol 768-769 ◽  
pp. 519-525 ◽  
Author(s):  
Sebastjan Žagar ◽  
Janez Grum
Keyword(s):  
Residual Stress ◽  
Surface Layer ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Shot Peening ◽  
Fatigue Testing ◽  
Stress Profile ◽  
Treatment Conditions ◽  
Stress Profiles ◽  
Compressive Residual Stresses

The paper deals with the effect of different shot peening (SP) treatment conditions on the ENAW 7075-T651 aluminium alloy. Suitable residual stress profile increases the applicability and life cycle of mechanical parts, treated by shot peening. The objective of the research was to establish the optimal parameters of the shot peening treatment of the aluminium alloy in different precipitation hardened states with regard to residual stress profiles in dynamic loading. Main deformations and main residual stresses were calculated on the basis of electrical resistance. The resulting residual stress profiles reveal that stresses throughout the thin surface layer of all shot peened specimens are of compressive nature. The differences can be observed in the depth of shot peening and the profile of compressive residual stresses. Under all treatment conditions, the obtained maximum value of compressive residual stress ranges between -200 MPa and -300 MPa at a depth between 250 μm and 300 μm. Comparison of different temperature-hardened aluminium alloys shows that changes in the Almen intensity values have greater effect than coverage in the depth and profile of compressive residual stresses. Positive stress ratio of R=0.1 was selected. Wöhler curves were determined in the areas of maximum bending loads between 30 - 65 % of material's tensile strength, measured at thinner cross-sections of individual specimens. The results of material fatigue testing differ from the level of shot peening on the surface layer.

Residual stresses in AA7108 aluminium alloy sheets joined by friction stir welding

2009 ◽  
Vol 24 (3) ◽  
pp. 301-309 ◽  
Author(s):  
Saliha Gachi ◽  
Farid Belahcene ◽  
Fouad Boubenider
Keyword(s):  
Friction Stir Welding ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Friction Stir

Residual stresses in welded joints in 1460 aluminium alloy

2007 ◽  
Vol 21 (12) ◽  
pp. 879-883
Author(s):  
A.A. Antonov ◽  
G.N. Chernyshev ◽  
V.V. Ovchinnikov ◽  
E.R. Zamaletdinov
Keyword(s):  
Residual Stresses ◽  
Aluminium Alloy ◽  
Welded Joints

Prediction and Minimization of Residual Stresses in Quenched Aluminium Alloy Die Forgings

1989 ◽  
pp. 581-586 ◽  
Author(s):  
B. Dubost ◽  
M. Bouet-Griffon ◽  
P. H. Jeanmart ◽  
M. O. Homette
Keyword(s):  
Residual Stresses ◽  
Aluminium Alloy

Study on the Influence of Anisotropy on Cutting Performance of Aviation Aluminium Alloy 7050-T7451

2020 ◽  
Vol 990 ◽  
pp. 29-35
Author(s):  
Hui Wang ◽  
Ying Meng ◽  
Duo Duo Li ◽  
Xiu Li Fu ◽  
Qi Hang Shi
Keyword(s):  
Aluminium Alloy ◽  
Orthogonal Cutting ◽  
Cutting Speed ◽  
Cutting Parameters ◽  
Cutting Performance ◽  
Rolled Sheet ◽  
Feed Speed ◽  
Aluminium Alloy 7050 ◽  
Degree Of Anisotropy ◽  
Forming Angle

Based on the hypocycloid theory, a highspeed orthogonal cutting simulation model was established. The cutting parameters (cutting speed, feed rate) and plane forming angle of the workpiece of aeronautical aluminium alloy 7050-T7451 pre-stretched rolled sheet were simulated and validated. The mapping relationship between cutting parameters, anisotropy and cutting performance was analyzed. The results show that the degree of anisotropy and the difficulty of material cutting are proportional to the forming angle, and the anisotropy decreases with the increase of cutting speed and the decrease of feed speed. Finally, the optimal cutting process range of aluminum alloy 7050-T7451 was obtained, which provides data support for highspeed cutting of anisotropic materials.

scholarly journals Prediction and Measurement of Machining Distortion in Aluminium Alloy 7085

2014 ◽  
Vol 996 ◽  
pp. 640-645 ◽  
Author(s):  
Zhang Zheng ◽  
Liang Li ◽  
Yin Fei Yang ◽  
Ning He ◽  
Wei Zhao
Keyword(s):  
Numerical Methods ◽  
Stress Field ◽  
Residual Stresses ◽  
Aluminium Alloy ◽  
Experimental Verification ◽  
Structural Part ◽  
Cold Compression ◽  
Manufacturing Operations ◽  
Part Distortion ◽  
Good Agreement

It is essential to accurately predict or model the residual stresses in a material resulting from various manufacturing operations. Numerical methods were used in this study to predict the residual stresses after quenching and cold compression of an Al 7085 forged block. Experimental verification was provided by comparing the measured distortions due to a relaxation of the residual stresses with the predictions obtained by using a simulated stress field. The validation was carried out on a simplified structural part. The measured and simulated distortions were found to be in good agreement with each other. The results indicated that part distortion is attributable to the relaxation of bulk residual stresses.

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