Determination of the elastic-plastic fracture mechanics Z-factor for alloy 182 weld metal flaws

Shim, Do-Jun; Wilkowski, G.; Rudland, D.

doi:10.1016/j.ijpvp.2011.05.001

Cited by 5 publications

(2 citation statements)

References 12 publications

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“…The RMS difference between a given model output and the benchmark is then computed and normalized by a representative weld metal yield strength, where the first term in the parentheses reflects the subject model output at the i th position through thickness, and the second term reflects the benchmark (average across model submissions). The difference is normalized by the yield strength of Alloy 182 weld metal (380 MPa), which is similar to the strength of the Alloy 82 weld metal used in the mockup [10], but Alloy 182 is more representative of in-service plant welds.…”

Section: Differences In Stressmentioning

confidence: 99%

Validation Approaches for Weld Residual Stress Simulation

Hill

Tran

Broussard

2014

Volume 6B: Materials and Fabrication

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In assessment of stress corrosion cracking behavior of susceptible welded materials, the contribution of weld residual stress is a key input for stress intensity factor calculations, which in turn are used to determine anticipated crack growth and to plan for inspection or repair. Without accurate weld residual stress information, it is challenging to develop an optimal plan for plant management. Weld residual stress simulations, based on non-linear finite element computations, provide a means to estimate residual stresses in components. However, there is no established, consensus approach for weld residual stress model validation, which could be used to judge model quality, specifically with respect to the influence of residual stress output on plant management decisions. A consensus model validation approach would benefit a broad range of stakeholders in pressure vessel technology.The paper provides technical detail of example approaches for weld residual stress model validation, and applies these approaches to a set of weld residual stress model outputs that were developed in the context of an industry round robin. The set of outputs is from Phase 2a of the international round robin organized cooperatively by the U.S. Nuclear Regulatory Commission and the Electric Power Research Institute. Example validation approaches include comparisons of output from one model with output from other models, as well as comparisons of model output with data from residual stress measurements. The figures of merit used for comparisons range from simple (e.g., evaluation of mechanical section forces) to complex (e.g., comparison of predicted crack growth behavior). Applying a range of validation approaches provides information for use within the technical community, to support development of a consensus approach for weld residual stress model validation.

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Section: Differences In Stressmentioning

confidence: 99%

Validation Approaches for Weld Residual Stress Simulation

Hill

Tran

Broussard

2014

Volume 6B: Materials and Fabrication

View full text Add to dashboard Cite

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“…Because of the intensity of welding process, the metals near heat source are signi cantly a ected by the temperature, resulting in uneven distribution of the material microstructure of the welded joint [1][2][3]; thus, under the interaction of residual stress, nonuniformity of mechanical properties of microstructure, and other complex mechanical and environmental factors, micro-cracks are easy to occur in welded joints, such as welding hot breaking, cold crack, reheat crack, lamellar tearing, and stress corrosion crack, which has become a potential safety hazard in the service process of welded joints. erefore, the welded joints are the key areas of structural integrity analysis, and local mechanical heterogeneity needs to be properly expressed.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Crack Tip Mechanical Field of Inhomogeneous Materials in Welded Joints by USDFLD Subroutine

Yuan

Hao

et al. 2022

Advances in Materials Science and Engineering

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The unevenly distributed mechanical properties of welded joints are one of the important factors, which affect welded joints’ safety seriously. The user-defined field (USDFLD) subroutine in ABAQUS finite element software can introduce variable-dependent material properties. This method can define inhomogeneous materials whose mechanical parameters depend on spatial coordinates and can be used to characterize the uneven mechanical properties of heat-affected zone and fusion zone. By establishing the static crack finite element model of welded joint with continuous change in yield strength, the sudden change in mechanical field in the numerical simulation process of sandwich structure model is eliminated. Compared with the existing numerical simulation methods of local mechanical heterogeneity of welded joints, this method provides a method to realize the structural integrity evaluation of welded joints.

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