Determination of Multiple Near-Surface Residual Stress Components in Laser Peened Aluminum Alloy via the Contour Method

2015 ◽  
Vol 46 (9) ◽  
pp. 4268-4275 ◽  
Author(s):  
M. Burak Toparli ◽  
Michael E. Fitzpatrick ◽  
Salih Gungor
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Contour Method ◽  
Surface Residual Stress ◽  
Near Surface ◽  
Stress Components

Determination of Real Space Residual Stress Distributions σij(z) of Surface Treated Materials with Diffraction Methods Part II: Energy Dispersive Approach

2006 ◽  
Vol 524-525 ◽  
pp. 37-44 ◽  
Author(s):  
Ingwer A. Denks ◽  
Manuela Klaus ◽  
Christoph Genzel
Keyword(s):  
Residual Stress ◽  
Stress Gradient ◽  
Depth Resolution ◽  
Real Space ◽  
Stress Distributions ◽  
Surface Residual Stress ◽  
Multilayer Systems ◽  
Near Surface ◽  
Gauge Volume

The detection of near surface residual stress gradients in real space requires high depth resolution for any orientation of the diffraction vector with respect to the sample co-ordinate system. In order to meet this demand, the slits are no longer being fixed in the laboratory co-ordinate system as in strain scanning experiments but directly coupled with the sample. Hence, the gauge volume orientation within the sample remains constant and allows performing depth-resolved sin2ψ measurements in real space. The method’s accuracy is determined by the gauge volume definition, which is investigated in detail. Apart from the evaluation of the σ(τ) versus σ(z) relation, which is of fundamental interest in X-ray residual stress gradient analysis, the method will be shown to have a unique applicability in rather delicate sample geometries such as multilayer systems.

Residual Stress Depth Profiling on Ground and on Polished Surfaces of an Al2O3/SiC(w) Composite

1995 ◽  
Vol 39 ◽  
pp. 371-380
Author(s):  
X. Zhu ◽  
P. Predecki ◽  
M. Eatough ◽  
R. Goebner
Keyword(s):  
Residual Stress ◽  
Depth Profiling ◽  
Grazing Incidence ◽  
Inversion Method ◽  
Laplace Method ◽  
X Ray Diffraction ◽  
Surface Residual Stress ◽  
Near Surface ◽  
X Ray ◽  
Stress Components

This study uses the asymmetric grazing incidence x-ray diffraction (GIXD) method and related z-profile retrieval techniques to study the near surface residual stress depth proflles on ground and on polished surfaces of hot-pressed Al2O2SiC(w) composite specimen. The z-profiles of stress components σ11, σ22 and σ33 of the Al2O3 matrix were obtained by using the numerical inversion method as well as the inverse Laplace method. Both τ- and z-profiles of residual stresses are presented.

Effect of Milling Speed and Feed on Surface Residual Stress of 7050-T7451 Aluminum Alloy

2012 ◽  
Vol 499 ◽  
pp. 217-222 ◽  
Author(s):  
C. Li ◽  
Yi Wan ◽  
R.R. Zhang ◽  
Zhan Qiang Liu
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Cutting Speed ◽  
Diffraction Method ◽  
Cutting Condition ◽  
Feed Speed ◽  
X Ray Diffraction ◽  
Surface Residual Stress ◽  
Orthogonal Direction ◽  
Machined Surface

The residual stress in the milling of 7050-T7451 aluminum alloy was measured using X-ray diffraction method in which Psi-oscillation, Phi-oscillation and peak fit were adopted. Cutting speed and feed are main variables which were considered in this study. The results show that compressive residual stresses are generated in surface for the down milling generally, which is mainly due to burnishing effect between the tools flank face and the machined surface. In feed and its orthogonal direction, the effect of cutting speed and feed speed on residual stress is similar. Therefore, required residual stress can be achieved by controlling the cutting condition such as cutting speed, feed speed etc.

Numerical Analysis of Surface Residual Stress of NC Milling 7075-T7451 Aluminum Alloy

2009 ◽  
Vol 407-408 ◽  
pp. 718-722
Author(s):  
Hong Feng Wang ◽  
Dun Wen Zuo ◽  
Li Tao Wang ◽  
Hong Miao ◽  
Hong Jun Wang
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Numerical Analysis ◽  
Mathematic Model ◽  
Regression Testing ◽  
Surface Residual Stress ◽  
Orthogonal Regression ◽  
Milling Parameters ◽  
Finished Surface ◽  
Nc Milling

The mathematic model was established between finished surface residual stress and milling parameters by orthogonal regression testing. The rationality of the model was certified by FEM and test. The simulation hypothesis and process were verified by the model. The test showed that the model and FEM were feasible.

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