Experimental Investigation Into the Fatigue of Welded Stiffened 350WT Steel Plates Using Neutron Diffraction Method

Yuen, B. K. C.; Taheri‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬‬, Farid; Gharghouri, Michael A.

doi:10.1111/j.1475-1305.2008.00400.x

Cited by 3 publications

(1 citation statement)

References 17 publications

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“…A wide variety of methods are available to measure surface and through‐thickness stresses in engineering components. Residual stress measurement techniques are generally classified into two fundamental approaches of diffraction‐based methods (neutron diffraction (ND) [2–4]) and strain relaxation methods, with the latter being divided into destructive (contour [4, 5], slitting, block removal) and semi‐destructive (deep hole drilling (DHD) [6–8]). Diffraction‐based methods based mainly on Bragg diffraction determine the residual stresses from changes in interplanar spacing ( d ‐spacing), which measure the expansion or contraction of lattice planes.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Validation of Welding Residual Stresses Based on Non‐Linear Mixed Hardening Model

Xu¹,

Gilles²,

Duan³

2012

Strain

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This study contributes to Phase 2 of the Task Group 1 round robin in the NeT European Network. To obtain better prediction results, in the thermal analysis, two significant changes are used. The welding efficiency, η, is fixed at 75%, and the weld bead fusion boundary profiles are based upon macrographs taken from welded specimens, which have been destructively examined. In the subsequent mechanical simulation, a non‐linear kinematic or mixed isotropic–kinematic hardening model should be employed, and a progressive annealing scheme or explicit consideration of visco‐plastic or creep effects should be implemented to handle high‐temperature inelastic strains and reduce stress discontinuities. In this study, an uncoupled 3D thermal and mechanical analysis was carried out using the software code SYSWELD. In the thermal simulation, a two‐offset‐double‐ellipsoid heat source model was developed, and the parameters were fitted using the heat source fitting tool. Power intensity was applied to simulate 1‐s dwelling time at the weld start end. Offset distances between two double ellipsoids were adjusted to obtain the weld bead transverse fusion boundary profiles at different positions. Predicted temperatures were compared with the measured data by thermocouples on the test pieces. In the mechanical analysis, a new material constitutive model, non‐linear mixed hardening model, was developed. Tension–compression cyclic tests were simulated at different temperatures using three different material hardening models (isotropic hardening model, kinematic hardening model and non‐linear mixed isotropic–kinematic hardening model), and the predicted cyclic stress–strain curves were compared with the measured data. Effects of three different hardening models on the welding residual stresses were studied. Compared with the measured data, the optimum material hardening model was confirmed.

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Section: Introductionmentioning

confidence: 99%

Simulation and Validation of Welding Residual Stresses Based on Non‐Linear Mixed Hardening Model

Xu¹,

Gilles²,

Duan³

2012

Strain

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Residual stresses in high strength steel welded box sections

Khan

Paradowska

et al. 2016

Journal of Constructional Steel Research

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Characterization of Welding-Induced Residual Stress Using Neutron Diffraction Technique

Zondi

Venter

Marais

et al. 2017

Journal of Pressure Vessel Technology

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Pressure vessels comprise critical plant equipment within industrial operations. The fact that the vessel operates under pressure, and may carry toxic, dangerous, or hazardous contents, necessitates that care is taken to ensure safety of humans operating it and the environment within which it operates. Residual stress developed during welding of pressure vessel structures can adversely affects fatigue life (mean stress effect) of such structure and lead to corrosion crack growth. The present study applies the neutron diffraction (ND) technique to formulate the stress field distribution of a nozzle-to-shell weld joint of a pressure vessel. A number of experiments are conducted using the submerged arc welding (SAW) process at various parametric combinations to develop a number of specimens with different stress profiles. It is shown that the hoop stresses close to the weld center line (WCL) are highly tensile and have values close to the yield strength of the material. The ideal parametric combination is also determined based on the results with lowest stresses. The results obtained in this study are congruent to the results of similar studies in the literature.

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Experimental Investigation Into the Fatigue of Welded Stiffened 350WT Steel Plates Using Neutron Diffraction Method

Cited by 3 publications

References 17 publications

Simulation and Validation of Welding Residual Stresses Based on Non‐Linear Mixed Hardening Model

Simulation and Validation of Welding Residual Stresses Based on Non‐Linear Mixed Hardening Model

Residual stresses in high strength steel welded box sections

Characterization of Welding-Induced Residual Stress Using Neutron Diffraction Technique

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