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.

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.

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

scholarly journals Residual Stress Measurements on a Metal Matrix Composite Using the Contour Method with Brittle Fracture

2014 ◽  
Vol 996 ◽  
pp. 349-354 ◽  
Author(s):  
Jeferson Araujo de Oliveira ◽  
Michael E. Fitzpatrick ◽  
Jan Kowal
Keyword(s):  
Residual Stress ◽  
Fatigue Crack ◽  
Brittle Failure ◽  
Metal Matrix ◽  
Crack Surface ◽  
Contour Method ◽  
Wire Edm ◽  
Stress Measurements ◽  
Fatigue And Fracture ◽  
Cut Surface

In this work we evaluate the application of the contour method to fatigue and fracture surfaces. Residual stress measurements were made on quenched and aged AA2124-SiCp composite using neutron diffraction, the contour method with wire EDM, and the contour method on a fatigue crack surface including brittle failure. The contour method successfully measured residual stresses from a wire electro-discharge cut surface, but the fracture method results suggest that residual stress information is lost due to plasticity during fatigue crack growth.

scholarly journals Experimental Characterisation and Numerical Modelling of Residual Stresses in a Nuclear Safe-End Dissimilar Metal Weld Joint

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1298
Author(s):  
Shuyan Zhang ◽  
Zhuozhi Fan ◽  
Jun Li ◽  
Shuwen Wen ◽  
Sanjooram Paddea ◽  
...  
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Weld Joint ◽  
Steel Tube ◽  
Contour Method ◽  
Fe Modelling ◽  
Dissimilar Metal ◽  
Dissimilar Metal Weld ◽  
Metal Weld

In this study, a mock-up of a nuclear safe-end dissimilar metal weld (DMW) joint (SA508-3/316L) was manufactured. The manufacturing process involved cladding and buttering of the ferritic steel tube (SA508-3). It was then subjected to a stress relief heat treatment before being girth welded together with the stainless steel tube (316L). The finished mock-up was subsequently machined to its final dimension. The weld residual stresses were thoroughly characterised using neutron diffraction and the contour method. A detailed finite element (FE) modelling exercise was also carried out for the prediction of the weld residual stresses resulting from the manufacturing processes of the DMW joint. Both the experimental and numerical results showed high levels of tensile residual stresses predominantly in the hoop direction of the weld joint in its final machined condition, tending towards the OD surface. The maximum hoop residual stress determined by the contour method was 500 MPa, which compared very well with the FE prediction of 467.7 Mpa. Along the neutron scan line at the OD subsurface across the weld joint, both the contour method and the FE modelling gave maximum hoop residual stress near the weld fusion line on the 316L side at 388.2 and 453.2 Mpa respectively, whereas the neutron diffraction measured a similar value of 480.6 Mpa in the buttering zone near the SA508-3 side. The results of this research thus demonstrated the reasonable consistency of the three techniques employed in revealing the level and distribution of the residual stresses in the DMW joint for nuclear applications.

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