Finite element modelling of shot peening process: Prediction of the compressive residual stresses, the plastic deformations and the surface integrity

2006 ◽  
Vol 426 (1-2) ◽  
pp. 173-180 ◽  
Author(s):  
M. Frija ◽  
T. Hassine ◽  
R. Fathallah ◽  
C. Bouraoui ◽  
A. Dogui
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Surface Integrity ◽  
Shot Peening ◽  
Finite Element Modelling ◽  
Plastic Deformations ◽  
Element Modelling ◽  
Process Prediction ◽  
Compressive Residual Stresses

Stress Measurement Using a Bilayer Metal-Ceramic Strip

1992 ◽  
Vol 264 ◽  
Author(s):  
Shukla Kapur ◽  
Philip L. Flaltz
Keyword(s):  
Finite Element ◽  
Thermal Expansion ◽  
Residual Stresses ◽  
Finite Element Modelling ◽  
Stress Measurement ◽  
Second Phase ◽  
Thermal Expansion Mismatch ◽  
Element Modelling ◽  
Metal Ceramic ◽  
Stress Asymmetry

AbstractResidual stresses that develop in metal/ceramic bonded systems due to thermal expansion mismatch have been calculated using finite element modelling and measured experimentally using a simple bilayer strip. Bending in the strip occurs during cooling due to the stress asymmetry. Residual stresses are calculated by measuring the deflection of the strip and the temperature at which the strip is flat. Various compositions of both copper and nickel pastes, with and without glass and other second phase additions were evaluated on glass-ceramic. The effects of further processes, e.g. thermal cycling, brazing and plating, are also reported in this work.

The Effect of Die Channel Angles and their Combination on Plastic Deformation of Pure Copper during Equal Channel Angular Pressing Using Finite Element Modelling

2019 ◽  
Vol 31 ◽  
pp. 63-69
Author(s):  
Malothu Ramulu ◽  
Arkanti Krishnaiah
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Material Flow ◽  
Finite Element Modelling ◽  
Pure Copper ◽  
Plastic Deformations ◽  
Channel Angle ◽  
Element Modelling ◽  
Angular Pressing ◽  
Strain Inhomogeneity

It was investigated the effect of die channel angles and their combination on plastic deformation of pure copper during ECAP under friction and frictionless conditions using 2-D elastic-plastic finite element modelling. A sound knowledge obtained for the plastic deformation (material flow) and understood the relationships between plastic deformations. The modelling results suggested that strain inhomogeneity was lesser in channel angle 120o than channel angle 90o and pressing load as well as strain decrease with increasing die channel angle. The friction influence in case of combination of channel angles was negligible as compare to individual channel angles. The strain generation and distribution was more uniform in case of combination of channel angles as compare to individual channel angles.

scholarly journals Validation of a wide plate finite element model using digital image correlation

2011 ◽  
Vol 2 (3) ◽  
pp. 416-423
Author(s):  
K. De Keyser ◽  
F. Van Acker ◽  
Stijn Hertelé ◽  
Matthias Verstraete ◽  
Wim De Waele ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Finite Element Modelling ◽  
Element Model ◽  
Image Correlation ◽  
Defect Tolerance ◽  
Plastic Deformations ◽  
Test Setup ◽  
Element Modelling ◽  
Weld Defect

To investigate the influence of global plastic deformations on girth weld defect tolerance inpipelines, a parametric finite element model has been developed. This paper provides an experimentalvalidation of the model. It describes the test setup and instrumentation used for the evaluation of plasticstrain fields around a notch in a tension loaded non-welded X65 mini wide plate. LVDT measurements anddigital image correlation (DIC) results are compared to each other and to the results of finite elementsimulations. Whereas some deviation is observed owing to unavoidable experimental uncertainties andlimitations of finite element modelling, the overall correspondence is more than satisfying.

Geometry Effects when Controlling Residual Stresses in Friction Stir Welds by Mechanical Tensioning

2006 ◽  
Vol 524-525 ◽  
pp. 71-76 ◽  
Author(s):  
David G. Richards ◽  
Philip B. Prangnell ◽  
Philip J. Withers ◽  
Stewart W. Williams ◽  
Andrew Wescott ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Heat Input ◽  
Finite Element Modelling ◽  
Room Temperature ◽  
Welding Parameters ◽  
Fe Model ◽  
Element Modelling ◽  
Friction Stir ◽  
Low Sensitivity ◽  
Compressive Residual Stresses

Finite element modelling has proved to be an effective tool for the investigation of trends effected by changing welding conditions. This is especially important in mechanical tensioning of friction stir welds because of the large number of parameters involved. In this paper, an FE model is used to examine the effectiveness of the mechanical tensioning technique for controlling residual stresses in FSWs by the investigation of trends caused by changes to the welding parameters. Comparisons between different geometries, traverse speeds, and welding off-axis angle all produced consistent results, and showed that the peak stresses are most strongly influenced by both the local tensioning and heat input, and not by the more global welding conditions. The results also showed a progressive decrease in the residual stresses for increasing tensioning levels and, although affected by the heat input, a relatively low sensitivity to the welding variables. At tensioning levels greater than ~50% of the room temperature yield stress, tensile stresses were replaced by compressive residual stresses within the weld.

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