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.

Discrete Loading Ring-Core Method for Nonuniform In-Plane Residual Stress Analysis in Micro Area

2018 ◽  
Vol 85 (9) ◽  
Author(s):  
Peng Jin ◽  
Xide Li
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress Analysis ◽  
Finite Element Simulation ◽  
Stress Fields ◽  
The Core ◽  
Core Method ◽  
Element Simulation ◽  
Residual Stress Analysis ◽  
Ring Core

The ring-core method is often used in residual stress analysis. It is applied to macro- and microscale stress analysis and has a unique advantage of releasing the residual stress across the core instead of at a single point, which makes it possible to measure an uneven residual stress field within a limited area, especially when the area is too small to be measured by other techniques. We developed a new layer-by-layer stress analysis method based on the ring-core method to retrieve the uneven in-plane stress, in which a nonuniform load that surrounds the core is approximated by discrete loading and then used to reveal the stress distribution within the core. The displacement–stress relationship is calibrated through finite element simulation. Because of the difficulty of preparing a standard specimen with an accurate high-gradient in-plane field stress in an area of several micrometers, the performance of the method was tested by a finite element simulation experiment. Good matches were achieved when comparing the calculated stress fields and the stress fields in the simulation experiments, including the biaxial, uniaxial and high-gradient cases. The method was applied to a piece of superconductor stand with a highly nonuniform stress by using a 4 μm-diameter-area ring core cut with focused ion beam.

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.

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

Determination of the Necessary Geometric Parameters of the Specimen in Ring-Core Method

2013 ◽  
Vol 486 ◽  
pp. 90-95 ◽  
Author(s):  
František Menda ◽  
František Trebuňa ◽  
Patrik Šarga
Keyword(s):  
Residual Stress ◽  
Influential Factors ◽  
Hole Drilling ◽  
Hole Drilling Method ◽  
Incremental Method ◽  
Core Method ◽  
Measuring Techniques ◽  
Drilling Method ◽  
Non Destructive ◽  
Ring Core

There are several measuring techniques for determining residual stress which can be divided according to the created damage in to the construction in non-destructive, semi-destructive and destructive ones. One of the most common is semi-destructive hole-drilling method. This paper deals about Ring-Core method which is based on the similar principles. Today, there is no standard for the Ring-Core method, thus it is important to consider various influential factors. One of them are the dimensions of specimen. Calibration coefficients are determined by finite element (FE) analysis using the commercial software Solidworks. These coefficients are used for residual stress evaluation by incremental method used in Ring-Core method. The influence of different specimen dimensions on the accuracy of the evaluated residual stresses is considered.

XRD Residual Stress and Texture Analysis on 6082T Aluminum Alloy

2021 ◽  
Vol 1028 ◽  
pp. 409-414
Author(s):  
Maykel Manawan ◽  
Sovian Aritonang ◽  
Mas Ayu Elita Hafizah ◽  
Antonius Suban Hali ◽  
Nono Darsono ◽  
...  
Keyword(s):  
Residual Stress ◽  
Shear Stress ◽  
Aluminum Alloy ◽  
Residual Stresses ◽  
Stress Analysis ◽  
Texture Analysis ◽  
Transverse Direction ◽  
Rolling Direction ◽  
Residual Stress Analysis

The determination of residual stresses is of great importance for many threated metal applications. In this work, the XRD residual stress analysis was used to characterized tempered aluminum-based specimen 6082T with rotation angles (phi) 0°, 45° and 90°, respectively. Highest stress levels were found in the rolling direction (phi = 0°), while negligible along transfers direction (phi = 90°). In addition, a shear stress along rolling and transverse direction, and also the present of texture along (110) can be observed.

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