Natural Crack Growth Analyses for Circumferential and Axial PWSCC Defects in Dissimilar Metal Welds

Shim, Do-Jun; Kalyanam, S.; Brust, F. W.; Wilkowski, G.; Smith, Mike; Goodfellow, Andrew

doi:10.1115/1.4007040

Cited by 6 publications

(4 citation statements)

References 5 publications

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“…For verification of the proposed circumferential crack transition model, crack growth results using the proposed method were compared to the results obtained from the natural crack growth analysis (or AFEA). The AFEA method can simulate crack growth in a more natural way by using the K I values along the entire crack front, i.e., the increment of crack growth is determined based on the K I value at every nodal point, allowing a nonidealized shape of the crack front that is similar to the actual shape [8][9][10].…”

Section: Verification Of Circumferential Crack Transition Modelmentioning

confidence: 99%

See 1 more Smart Citation

Surface to Through-Wall Crack Transition Model for Circumferential Cracks in Pipes

Shim

Park

Kurth

et al. 2021

Journal of Pressure Vessel Technology

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In the present paper, finite element analyses were performed to update and also extend the applicable ranges of the existing KI and COD solutions for non-idealized through-wall cracks. Then, a surface to through-wall crack transition model was proposed based on these solutions. The proposed model provides a criterion which determines when the final surface crack should transition to a through-wall crack. It also provides a criterion to determine the two crack lengths (at the inner and outer diameter surfaces) of the initial non-idealized through-wall crack. Furthermore, crack growth of non-idealized through-wall cracks can be simulated by using the proposed method. Finally, the proposed model was verified by demonstrating that it can well predict the surface to through-wall transition behavior when compared to the natural crack growth simulations.

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Section: Verification Of Circumferential Crack Transition Modelmentioning

confidence: 99%

“…The updated K I and COD solutions are utilized in crack growth simulations and leak rate calculations for nonidealized TWCs in pipes. Finally, the model was verified by achieving good agreement with the natural crack growth analysis (or advanced finite element analysis (AFEA)) results [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Surface to Through-Wall Crack Transition Model for Circumferential Cracks in Pipes

Shim

Park

Kurth

et al. 2021

Journal of Pressure Vessel Technology

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“…Dehaghi et al [11] investigated the distribution and magnitude of the residual stresses created by thermal processes of the main feed water nozzle in a 100-MW AP1000 power plant reactor. Taking larger size of actual safe-end/nozzle welding joints into consideration, most researchers use a mock-up to investigate residual stress distributions [12][13][14][15][16][17][18][19]. In order to assess the susceptibility of components to PWSCC (primary water stress corrosion cracking), Smith et al [5,12] performed a detailed finite element simulation covering the full manufacturing history of pressurizer safety/relief valve (SRV) nozzle dissimilar metal weld mock-ups, without and with the full structural weld overlay.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Residual Stresses of the Safe-End/Nozzle Dissimilar Metal Welded Joint in CAP1400 Nuclear Power Plants

Dong

Gao

2018

Acta Metall. Sin. (Engl. Lett.)

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The residual stress evolution in a safe-end/nozzle dissimilar metal welded joint of CAP1400 nuclear power plants was investigated in the manufacturing process by finite element simulation. A finite element model, including cladding, buttering, post-weld heat treatment (PWHT) and dissimilar metal multi-pass welding, is developed based on SYSWELD software to investigate the evolution of residual stress in the aforementioned manufacturing process. The results reveal a large tensile axial residual stress, which exists at the weld zone on the inner surface, leads to a high sensitivity to stress corrosion cracking (SCC). PWHT process before dissimilar metal multi-pass welding process has a great influence on the magnitude and distribution of final axial residual stress. The risk of SCC on the inner surface of the pipe will increase if PWHT process is not taken into account. Therefore, such crucial thermal manufacturing process such as cladding, buttering and post-weld heat treatment, besides the multi-pass welding process, should be considered in the numerical model in order to accurately predict the distribution and the magnitude of the residual stress.

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“…Ogawa et al (2009) adopted isotropic hardening model to predicted the residual stress in the dissimilar metal J-groove joint. But the isotropic hardening model tends to increase both the absolute magnitude and amplitude of predicted residual stresses 1436 EC 33,5 (Bae et al, 2014) and provide the most conservative results (Shim et al, 2012). Deng et al (2008) selected linear kinematic hardening to simulate the residual stress in butt-welded austenitic stainless steel pipe.…”

Section: Introductionmentioning

confidence: 99%

Effects of material hardening model and lumped-pass method on welding residual stress simulation of J-groove weld in nuclear RPV

Liu

Luo

Yang

et al. 2016

Engineering Computations

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Purpose -The purpose of this paper is to clarify the effect of material hardening model and lump-pass method on the thermal-elastic-plastic (TEP) finite element (FE) simulation of residual stress induced by multi-pass welding of materials with cyclic plasticity. Design/methodology/approach -Nickel-base alloy and stainless steel, which are used in J-type weld for manufacturing the nuclear reactor pressure head, can easily harden during multi-pass welding. The J-weld welding experiment is carried out and the temperature cycle and residual stress are measured to validate the TEP simulation. Thermal-mechanical sequence coupling method is employed to get the welding residual stress. The lumped-pass model and pass-by-pass FE model are built and two materials hardening models, kinematic hardening model and mixed hardening model, are adopted during the simulations. The effects of material hardening models and lumped-pass method on the residual stress in J-weld are distinguished. Findings -Based on the kinematic hardening model, the stresses simulated with the lumped-pass FE model are almost consistent with those obtained by the pass-by-pass FE model; while with the mixed hardening material model, the lumped-pass method has great effect on the simulated stress. Practical implications -A computation with mixed isotropic-kinematic material seems not to be the appropriate solution when using the lumped-pass method to save the computation time. Originality/value -In the simulation of multi-pass welding residual stress involved in materials with cyclic plasticity, the material hardening model should be carefully considered. The kinematic hardening model with lump-pass FE model can be used to get better simulation results with less computation time. The results give a direction for welding residual stress simulation for the large structure such as the reactor pressure vessel.

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Natural Crack Growth Analyses for Circumferential and Axial PWSCC Defects in Dissimilar Metal Welds

Cited by 6 publications

References 5 publications

Surface to Through-Wall Crack Transition Model for Circumferential Cracks in Pipes

Surface to Through-Wall Crack Transition Model for Circumferential Cracks in Pipes

Numerical Investigation on Residual Stresses of the Safe-End/Nozzle Dissimilar Metal Welded Joint in CAP1400 Nuclear Power Plants

Effects of material hardening model and lumped-pass method on welding residual stress simulation of J-groove weld in nuclear RPV

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