S84 Determination of the Residual Stress Fields Around Scratches in Al Alloys

2008 ◽  
Vol 23 (2) ◽  
pp. 187-187
Author(s):  
M. K. Khan ◽  
M. E. Fitzpatrick ◽  
L. Edwards ◽  
S. V. Hainsworth
Keyword(s):  
Residual Stress ◽  
Al Alloys ◽  
Stress Fields

Temperature and Residual Stress Fields in an Austenitic Circumferential Pipe Weld

2002 ◽  
Author(s):  
Ruthard Bonn ◽  
Klaus Metzner ◽  
H. Kockelmann ◽  
E. Roos ◽  
L. Stumpfrock
Keyword(s):  
Residual Stress ◽  
Numerical Calculation ◽  
Stress Field ◽  
Quantitative Determination ◽  
Welding Residual Stress ◽  
Stress Fields ◽  
Residual Stress Field ◽  
Circumferential Welds ◽  
The Impact

The main target of a research programme “experimental and numerical analyses on the residual stress field in the area of circumferential welds in austenitic pipe welds”, sponsored by Technische Vereinigung der Großkraftwerksbetreiber e. V. (VGB) and carried out at MPA Stuttgart, was the validation of the numerical calculation for the quantitative determination of residual stress fields in austenitic circumferential pipe welds. In addition, the influence of operational stresses as well as the impact of the pressure test on the residual stress state had to be examined. By using the TIG orbital welding technique, circumferential welds (Material X 10 CrNiNb 18 9 (1.4550, corresponding to TP 347) were produced (geometric dimensions 255.4 mm I.D. × 8.8 mm wall) with welding boundary conditions and weld parameters (number of weld layers and weld built-up, seam volume, heat input) which are representative for pipings in power plants. Deformation and temperature measurements accompanying the welding, as well as the experimentally determined (X-ray diffraction) welding residual stress distribution, served as the basis for the verification of numeric temperature and residual stress field calculations. The material model on which the calculations were founded was developed by experimental weld simulations in the thermo-mechanical test rig GLEEBLE 2000 for the determination of the material behaviour at different temperatures and elasto-plastic deformation. The numeric calculations were carried out with the Finite Element program ABAQUS. The comparison of the calculation results with the experimental findings confirms the proven validation of the developed numerical calculation models for the quantitative determination of residual stresses in austenitic circumferential pipings. The investigation gives a well-founded insight into the complex thermo-mechanical processes during welding, not known to this extent from literature previously.

Determination of Residual Stress Fields with High Local Resolution

2006 ◽  
Vol 524-525 ◽  
pp. 279-284
Author(s):  
Bernd Hasse ◽  
Mustafa Koçak ◽  
Walter Reimers
Keyword(s):  
Material Processing ◽  
Residual Stress ◽  
Stress Distribution ◽  
High Spatial Resolution ◽  
Residual Stress Distribution ◽  
Stress Fields ◽  
Selective Determination ◽  
Position Sensitive ◽  
Non Destructive

The non-destructive and phase selective determination of residual stresses caused by material processing (such as welding) in polycrystalline samples is usually performed by diffraction methods. In order to obtain information about stress fields at high spatial resolution with conventional methods, for example with micro beam techniques, the sample needs to be scanned in a very time consuming manner. A much faster method is the simultaneous investigation of a larger area using position sensitive diffractometry. This method was used for the analysis of the residual stress distribution in laser beam welded thin (2 mm and 3 mm) magnesium sheets.

scholarly journals Determination of Residual Stress Fields in a Thermally Grown Oxide under Thermal Cycling Loadings, Using XRD and Raman Spectroscopy — Correlations with Microstructural States

2014 ◽  
Vol 996 ◽  
pp. 890-895
Author(s):  
Felaniaina Rakotovao ◽  
Zhao Jun Tao ◽  
Jean Luc Grosseau-Poussard ◽  
Benoit Panicaud ◽  
Gilles Bonnet ◽  
...  
Keyword(s):  
Residual Stress ◽  
Raman Spectroscopy ◽  
Residual Stresses ◽  
Thermally Grown Oxide ◽  
Stress Fields ◽  
Stress Release ◽  
Thermal Oxide ◽  
Long Time ◽  
Release Processes

The presence of residual stresses in thermal oxide layers has been recognized for a long time. In the present work, the mechanical fields for chromia oxide are determined either by XRD or Raman spectroscopy. In addition, the microstructure of the chromia films is investigated ant its influence on the evolution of the stress release processes is analyzed.

Determination of Nonuniform Residual Stresses Using the Ring-Core Method

1996 ◽  
Vol 118 (2) ◽  
pp. 224-228 ◽  
Author(s):  
A. Ajovalasit ◽  
G. Petrucci ◽  
B. Zuccarello
Keyword(s):  
Residual Stress ◽  
Integral Equation Method ◽  
Stress Fields ◽  
Core Method ◽  
Bending Load ◽  
Theoretical Predictions ◽  
Residual Stress Analysis ◽  
Incremental Strain ◽  
Ring Core

This paper considers residual stress analysis using the ring-core method. In particular, the so-called integral equation method is applied to evaluate nonuniform residual stress fields. The proposed method overcomes typical drawbacks of the incremental strain method which lead to incorrect results for strongly varying stress fields. The experimental results obtained with a specimen subjected to a bending load confirm the theoretical predictions.

Application of synchrotron X-ray diffraction and nanoindentation for the determination of residual stress fields around scratches

2011 ◽  
Vol 59 (20) ◽  
pp. 7508-7520 ◽  
Author(s):  
M.K. Khan ◽  
M.E. Fitzpatrick ◽  
S.V. Hainsworth ◽  
A.D. Evans ◽  
L. Edwards
Keyword(s):  
Residual Stress ◽  
Stress Fields ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Thermal Stresses in Chemically Hardening Elastic Media With Application to the Molding Process

1974 ◽  
Vol 41 (3) ◽  
pp. 647-651 ◽  
Author(s):  
Myron Levitsky ◽  
Bernard W. Shaffer
Keyword(s):  
Residual Stress ◽  
Chemical Reaction ◽  
Thermal Stresses ◽  
Stress Component ◽  
Elastic Solid ◽  
Molding Process ◽  
Hardening Process ◽  
Exothermic Chemical Reaction ◽  
Component Parallel

A method has been formulated for the determination of thermal stresses in materials which harden in the presence of an exothermic chemical reaction. Hardening is described by the transformation of the material from an inviscid liquid-like state into an elastic solid, where intermediate states consist of a mixture of the two, in a ratio which is determined by the degree of chemical reaction. The method is illustrated in terms of an infinite slab cast between two rigid mold surfaces. It is found that the stress component normal to the slab surfaces vanishes in the residual state, so that removal of the slab from the mold leaves the remaining residual stress unchanged. On the other hand, the residual stress component parallel to the slab surfaces does not vanish. Its distribution is described as a function of the parameters of the hardening process.

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