scholarly journals Neutron Diffraction Measurement of Residual Stresses in ?OSU Plate.?

2013 ◽  
Author(s):  
Donald W. Brown ◽  
Bjorn Clausen ◽  
Thomas A. Sisneros ◽  
Maria A. Okuniewski
Keyword(s):  
Neutron Diffraction ◽  
Residual Stresses ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement

scholarly journals Neutron diffraction measurement of residual stresses in Al-clad U–10Mo fuel plates

2016 ◽  
Vol 474 ◽  
pp. 8-18 ◽  
Author(s):  
D.W. Brown ◽  
M.A. Okuniewski ◽  
B. Clausen ◽  
G.A. Moore ◽  
T.A. Sisneros
Keyword(s):  
Neutron Diffraction ◽  
Residual Stresses ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement

Neutron Diffraction Measurement of Residual Stresses in AA6082 Quenched Samples

2000 ◽  
Vol 347-349 ◽  
pp. 598-602 ◽  
Author(s):  
G. Albertini ◽  
G. Caglioti ◽  
F. Fiori ◽  
Thilo Pirling ◽  
V. Stanic ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Residual Stresses ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement

Comparison of Brazed Residual Stress and Thermal Deformation between X-Type and Pyramidal Lattice Truss Sandwich Structure: Neutron Diffraction Measurement and Simulation Study

2016 ◽  
Vol 35 (6) ◽  
pp. 567-574 ◽  
Author(s):  
Wenchun Jiang ◽  
Zhiquan Wei ◽  
Yun Luo ◽  
Weiya Zhang ◽  
Wanchuck Woo
Keyword(s):  
Residual Stress ◽  
Neutron Diffraction ◽  
Residual Stresses ◽  
Sandwich Structure ◽  
Thermal Deformation ◽  
Diffraction Measurement ◽  
Neutron Diffraction Measurement ◽  
Pyramidal Structure ◽  
Transverse Stresses ◽  
Type Lattice

AbstractThis paper uses finite element method and neutron diffraction measurement to study the residual stress in lattice truss sandwich structure. A comparison of residual stress and thermal deformation between X-type and pyramidal lattice truss sandwich structure has been carried out. The residual stresses are concentrated in the middle joint and then decreases gradually to both the ends. The residual stresses in the X-type lattice truss sandwich structure are smaller than those in pyramidal structure. The maximum longitudinal and transverse stresses of pyramidal structure are 220 and 202 MPa, respectively, but they decrease to 190 and 145 MPa for X-type lattice truss sandwich structure, respectively. The thermal deformation for lattice truss sandwich panel structure is of wave shape. The X-type has a better resistance to thermal deformation than pyramidal lattice truss sandwich structure. The maximum wave deformation of pyramidal structure (0.02 mm) is about twice as that of X-type (0.01 mm) at the same brazing condition.

Neutron Diffraction Measurement of Weld Residual Stresses in an UOE Linepipe Subjected to Mechanical Expansion

2013 ◽  
Author(s):  
Shuwen Wen ◽  
Hongbiao Dong ◽  
Shu Yan Zhang ◽  
Adam Bannister ◽  
Martin Connelly
Keyword(s):  
Neutron Diffraction ◽  
Yield Strength ◽  
Residual Stresses ◽  
Parent Material ◽  
Lattice Parameters ◽  
Diffraction Measurement ◽  
Fe Modelling ◽  
Neutron Diffraction Measurement ◽  
Seam Weld ◽  
Expansion Condition

Weld residual stresses in double submerged arc welded (DSAW) UOE linepipes can have significant implications on the integrity and in-service performance of the pipeline from which it is normally constructed, often for deep and ultra-deep water applications. Therefore they have to be considered as a crucial data input for accurate Engineering Critical Assessments (ECAs) of offshore pipelines. This has so far been based on the assumption that the residual stresses in the UOE pipe seam weld are equal to the yield strength of the parent material: an assumption that is likely to cause over-conservatism in conventional pipeline design. In the current study neutron diffraction technique was used to quantify the weld residual stresses of an UOE linepipe (18″ OD × 25.4mm WT, grade X65) in post-expansion condition. The UOE linepipe manufacturing process is briefly introduced first, which involves forming steel plate into pipe, followed by DSAW seam welding and then pipe mechanical expansion. The sample preparation for neutron diffraction measurement of lattice parameters is described next in detail. Neutron diffraction was used to measure the residual elastic strain within the pipe through the precise characterisation of the interplanar crystal lattice spacing and the atomic lattice itself was used as a strain gauge. The measurements were mainly taken in and near the seam weld area of the pipe along the pre-defined lines in through-thickness and cross-weld orientations. The weld residual stresses in three primary directions, namely axial, hoop and radial, were calculated from the measured lattice parameters in as-supplied (welded and expanded) and stress-free conditions using Hooke’s law of linear elasticity, and are systematically presented in the paper. It was found that weld residual stresses of the UOE linepipe in post-expansion condition were significantly lower than the yield strength of the parent material, and in most cases these were less than 50% of the actual yield strength of the parent material. The mechanism of weld residual stress formation and the influence of post-weld expansion on the reduction and through-thickness normalisation of weld residual stresses were studied through finite element (FE) modelling analysis. Finally an example ECA analysis was carried out for the current linepipe under an assumed service loading condition. The degree of over-conservatism that could result by assuming weld residual stresses to be equal to the yield strength of the parent material was demonstrated, as compared to the situation where the values of the required residual stresses were taken from the neutron diffraction measurement. It was therefore shown by the current study that the combined approach of neutron diffraction measurement and FE modelling could greatly enhance the understanding of performance of seam-welded UOE pipes.

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