Restraining effect of support plates on the limit loads for circumferential cracks in the steam generator tube

Kim, Hyun-Su; Jin, Tae-Eun; Kim, Hong-Deok; Chang, Yoon‐Suk; Kim, Young‐Jin

doi:10.1016/j.nucengdes.2007.06.002

Cited by 12 publications

(11 citation statements)

References 6 publications

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“…is an analytical solution derived from the force and moment equilibriums under a free end assumption. Recently, it was revealed by Kim et al 9,11 . that the gives a significantly high LL, because it considers only a pressure‐induced axial stress in calculation of force and moment equilibriums.…”

Section: Limit Loads Of Uncracked Tubesmentioning

confidence: 99%

“…that the gives a significantly high LL, because it considers only a pressure‐induced axial stress in calculation of force and moment equilibriums. Based on a number of FE analyses and experimental results, Kim et al 9,11 . suggested that the factor of 2 in should be changed to 1.15 in order to consider the hoop stress effect on the LL.…”

Section: Limit Loads Of Uncracked Tubesmentioning

confidence: 99%

“…Material was assumed to be elastic‐perfectly plastic, obeying von Mises flow criterion, and symmetric conditions were considered in the FE models. In order to avoid the numerical problems associated with incompressibility, reduced integration 20‐noded elements were utilized 9,14 . In addition, the crack tip was modelled by using collapsed elements and 1/ r singularity was imposed by allowing the three nodes on the collapsed face to displace independently and keeping the midside nodes at the midpoints.…”

Section: Limit Loads Of Cracks At the Top Of The Tube Sheetmentioning

confidence: 99%

“…Wang et al 8 . investigated the effect of the support plate on the LL and stress intensity factor for a straight tube with a circumferential TWC, and the authors 9 suggested the LL solutions of circumferential TWCs for the restrained end condition. These solutions, however, can only be applicable to a pure internal pressure case, and there is no LL solution for combined loads incorporating the effect of the tube support plate.…”

Section: Introductionmentioning

confidence: 99%

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Support‐induced restraint effect of thin‐walled tube in a steam generator subjected to combined pressure and bending load

Kim¹,

Jin²,

Chang

et al. 2007

Fatigue Fract Eng Mat Struct

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A B S T R A C TThe restraint effects of support plates on limit load (LL) are evaluated for thin-walled tubes subjected to combined internal pressure and bending loads. To achieve this goal, three-dimensional (3D) finite element (FE) analyses assuming elastic-perfectly plastic material behaviour are carried out for tubes with various sizes of circumferential cracks. Two crack locations, both the top of the tube sheet (TTS) and transition regions, where circumferential cracks have been found in many steam generators during operation, are considered. FE analysis results show that LLs for the circumferential cracks are significantly affected by the boundary conditions of the tube and that the resulting LL solutions can be simply applied to the practical integrity assessment of steam generator tubes, because the comparison between experimental data and FE analysis results shows a good agreement. E = Young's modulus I = moment of inertia M L = limit bending moment M L FEA = limit bending moment by FE analysis M NL = normalized limit bending moment P L = limit pressure P L FEA = limit pressure by FE analysis P NL = normalized limit pressure R Bend = bend radius of tube R i = inner radius of tube R m = mean radius of tube R o = outer radius of tube S L = limit bending stress t = thickness of tube γ = restraint ratio θ = a half of crack angle λ = normalized bend radius (= R Bend t/R m 2 ) σ f = flow stress σ YS = yield strength σ UTS = tensile strength Correspondence: Y.-J. Kim.

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Section: Limit Loads Of Uncracked Tubesmentioning

confidence: 99%

Section: Limit Loads Of Uncracked Tubesmentioning

confidence: 99%

Section: Limit Loads Of Cracks At the Top Of The Tube Sheetmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Support‐induced restraint effect of thin‐walled tube in a steam generator subjected to combined pressure and bending load

Kim¹,

Jin²,

Chang

et al. 2007

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Further examples of models, which may be used in the definition of the failure function for various degradation processes have been proposed in the literature. Recent examples include for example (Revankar and Riznic 2009), (Kim, Oh et al 2010), (Hui and Li 2010), (Kim, Jin et al 2008) and (Hwang, Namgung et al 2008). …”

mentioning

confidence: 99%