Residual Stress Characterization in a Dissimilar Metal Weld Nuclear Reactor Piping System Mock Up

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Matthew Kerr ◽  
Michael B. Prime ◽  
Hunter Swenson ◽  
Miles A. Buechler ◽  
Michael Steinzig ◽  
...  
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Phase 1 ◽  
Nuclear Regulatory Commission ◽  
Contour Method ◽  
Hole Drilling ◽  
Piping System ◽  
304L Stainless Steel ◽  
Fe Model ◽  
Stress Measurements

Time-of-flight neutron diffraction, contour method, and surface hole drilling residual stress measurements were conducted at Los Alamos National Lab (LANL) on a lab sized plate specimen (P4) from phase 1 of the joint U.S. Nuclear Regulatory Commission and Electric Power Research Institute Weld Residual Stress (NRC/EPRI WRS) program. The specimen was fabricated from a 304L stainless steel plate containing a seven pass alloy 82 groove weld, restrained during welding and removed from the restraint for residual stress characterization. This paper presents neutron diffraction and contour method results, and compares these experimental stress measurements to a WRS finite element (FE) model. Finally, details are provided on the procedure used to calculate the residual stress distribution in the restrained or as welded condition in order to allow comparison to other residual stress data collected as part of phase 1 of the WRS program.

Characterization of a Plate Specimen From Phase I of the NRC/EPRI Weld Residual Stress Program

2011 ◽  
Author(s):  
Matthew Kerr ◽  
David L. Rudland ◽  
Michael B. Prime ◽  
Hunter Swenson ◽  
Miles A. Buechler ◽  
...  
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Phase I ◽  
Nuclear Regulatory Commission ◽  
Contour Method ◽  
304L Stainless Steel ◽  
Fe Model ◽  
Stress Measurements ◽  
Weld Residual Stress ◽  
Plate Specimen

Time-of-flight neutron diffraction and contour method residual stress measurements were conducted at Los Alamos National Lab (LANL) on a lab sized plate specimen (P4) from Phase I of the joint U.S. Nuclear Regulatory Commission and Electric Power Research Institute Weld Residual Stress (NRC/EPRI WRS) program. The specimen was fabricated from a 304L stainless steel plate containing a seven pass Alloy 82 groove weld, restrained during welding and removed from the restraint for residual stress characterization. This paper presents neutron diffraction and contour method results, and compares these experimental stress measurements to a WRS Finite Element (FE) model. Finally details are provided on the procedure used to calculate the residual stress distribution in the restrained or as welded condition in order to allow comparison to other residual stress data collected as part of the EPRI lead Phase I WRS program.

Through Thickness Residual Stress Measurements by Neutron Diffraction and Hole Drilling in a Single Laser-Peened Spot on a Thin Aluminium Plate

2013 ◽  
Vol 772 ◽  
pp. 167-172 ◽  
Author(s):  
M. Burak Toparli ◽  
Michael E. Fitzpatrick
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Diffraction Peak ◽  
Thin Plates ◽  
Hole Drilling ◽  
Stress Profile ◽  
X Ray Diffraction ◽  
X Ray ◽  
Stress Measurements ◽  
Incremental Hole Drilling

Residual stress measurements are very challenging in thin aluminium plates. Rolling-induced crystallographic texture can lead to an S-shape fit when using the sin2ψ method for surface X-ray diffraction. Peak broadening and missing peaks can also be observed for synchrotron X-ray diffraction with conventional θ/2θ scanning due to texture. In addition, when measuring near the plate surfaces, partially-filled gauge volumes in diffraction experiments will lead to “pseudo-strains”, an apparent shift between measured and actual positions for the diffraction peak. Obtaining a meaningful value of d0 for strain calculations is another issue for diffraction experiments in thin plates. The low thickness also offers challenges for destructive methods including incremental hole drilling, i.e. there is no defined ASTM standard for measuring non-uniform residual stress profile for thin plates. In this work, 2-mm-thick Al2024-T351 plate was investigated for residual stress fields due to laser peening. Neutron diffraction measurements were carried out at POLDI (Pulse Overlap time-of-flight Diffractometer) in PSI, Switzerland and the results are compared with incremental hole drilling.

Phase 2b Weld Residual Stress Round Robin: Mockup Design and Comparisons of Measurement and Simulation Results

2015 ◽  
Author(s):  
Michael L. Benson ◽  
Minh N. Tran ◽  
Michael R. Hill
Keyword(s):  
Residual Stress ◽  
Nuclear Regulatory Commission ◽  
Round Robin ◽  
Contour Method ◽  
Hole Drilling ◽  
Problem Statement ◽  
Double Blind ◽  
Weld Residual Stress ◽  
Surge Line ◽  
Regulatory Commission

The U. S. Nuclear Regulatory Commission and the Electric Power Research Institute, cooperating under the auspices of a memorandum of understanding, conducted a double-blind round robin study for prediction of weld residual stress in a full-scale pressurizer surge line mockup. This work is the latest in a series of studies aimed at understanding and reducing uncertainty in the numerical prediction of weld residual stress. The round robin study involved both measurements and modeling. The measurements included deep hole drilling and contour method. Ten international participants submitted finite element modeling results to the study. This paper summarizes the mockup design, the modeling problem statement, and the measurement and modeling results.

scholarly journals Residual stress measurements in offshore wind monopile weldments using neutron diffraction technique and contour method

2018 ◽  
Vol 96 ◽  
pp. 418-427 ◽  
Author(s):  
Anais Jacob ◽  
Jeferson Oliveira ◽  
Ali Mehmanparast ◽  
Foroogh Hosseinzadeh ◽  
Joe Kelleher ◽  
...  
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Offshore Wind ◽  
Contour Method ◽  
Stress Measurements ◽  
Neutron Diffraction Technique

Residual Stress Measurements Using the Contour, Deep-Hole Drilling and Neutron Diffraction Methods in T-Section Specimens

2016 ◽  
Author(s):  
Karim Serasli ◽  
Douglas Cave ◽  
Ed Kingston
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Complex Geometry ◽  
Contour Method ◽  
Hole Drilling ◽  
Deep Hole ◽  
Premature Failure ◽  
Deep Hole Drilling ◽  
The Wire

The presence of high magnitude residual stresses in welded components causes material degradation, local yielding and plastic deformation. Their presence provides the potential for premature failure and compromises the integrity of a structure. This paper presents a review of work carried out to ascertain the residual stresses present within T-section specimens, made from ferritic steel, in their as-welded condition. The standard and incremental deep hole drilling (DHD and iDHD) techniques, the neutron diffraction (ND) and the contour method were applied to characterise the residual stresses in the regions in and around the two fillet welds of the specimens and the surrounding parent material within which the balancing residual stresses needed to be measured. The results of these measurements are presented and compared to highlight agreements and discrepancies in the measured residual stress distributions using these different techniques. A compendium of measurements at a similar location in various T-sections and their comparison with the BS7910 standard show that the measured longitudinal distributions are similar despite the observed scatter. Finally, this paper briefly attempts to investigate and discuss the technical challenges identified when applying the contour method to complex geometry components. The constraint of the specimen during the wire electro-discharge machining (EDM) process, the quality of the wire EDM cut made and the analysis of the raw data for the conversion into residual stresses directly affect the accuracy of the contour method results. The identification and investigation of these challenges lead to continuous improvements of the contour method procedure and reduce uncertainties of the measurement.

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