Assessment of short through-wall circumferential cracks in pipes. Experiments and analysis: March 1990--December 1994

Brust, F. W.; Scott, Peter; Rahman, Saifur

doi:10.2172/46619

Cited by 9 publications

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“…The calculated values of J compare very well with existing solutions found in the literature. The J values from this study are comparatively closer to the Rahman [6] and Brust et al [1] solutions, which were also based on three-dimensional solid elements as opposed to the shell elements used by Kumar et al [26]. Fig.…”

Section: Example 2: a Through-wall-cracked Cylinder Specimensupporting

confidence: 76%

“…The continuous lines in Fig. 8 represent the values of J obtained from the GE/EPRI equations using the in¯uence functions derived by Rahman [6], Kumar et al [26], and Brust et al [1]. The solid points in Fig.…”

Section: Example 2: a Through-wall-cracked Cylinder Specimenmentioning

confidence: 98%

“…Fracture analysis can be based on linear-elastic or more complex elastic± plastic (nonlinear) models. It is well established that nonlinear fracture-mechanics methods, compared with the elastic methods [1,2], provide more realistic measures of fracture behavior of cracked structures with high toughness and low strength materials. Cracked components composed of these materials, when used in nuclear power plants, chemical and fossil plants, automobiles, and aerospace and aircraft propulsion systems, pose a serious threat to structural integrity.…”

Section: Introductionmentioning

confidence: 99%

“…Cracked components composed of these materials, when used in nuclear power plants, chemical and fossil plants, automobiles, and aerospace and aircraft propulsion systems, pose a serious threat to structural integrity. In much or all of the working temperature regime of these components, the material is typically stressed above the brittle-to-ductile transition temperature where the fracture response is essentially ductile, and the material is capable of considerable inelastic deformation [1,2]. As such, elastic±plastic theories should be employed in fracture analyses of these structural components.…”

Section: Introductionmentioning

confidence: 99%

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Probabilistic fracture mechanics for nonlinear structures

Rahman

Kim

2001

International Journal of Pressure Vessels and Piping

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Section: Example 2: a Through-wall-cracked Cylinder Specimensupporting

confidence: 76%

Section: Example 2: a Through-wall-cracked Cylinder Specimenmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Probabilistic fracture mechanics for nonlinear structures

Rahman

Kim

2001

International Journal of Pressure Vessels and Piping

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“…See Ref. [4,8] for justi®cation of using actual crack length over eective crack length. The evaluations of Fyap, R m at and h 1 yap, n, R m at are described in Appendix A.…”

Section: A New J-estimation Methodsmentioning

confidence: 99%

Elastic–plastic analysis of off-center cracks in cylindrical structures

Firmature

Rahman

2000

Engineering Fracture Mechanics

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This paper presents new elastic and elastic±plastic ®nite element solutions of the J-integral for a pipe containing o-center through-wall cracks under pure bending. The analysis is based on a three-dimensional nonlinear ®nite element method and small-strain theory. One hundred and ®ve analyses were performed using the ABAQUS commercial code for a wide variety of crack sizes, o-center crack angles, and material hardening exponents. The results from these analyses show that the J-integral values at the two crack fronts of an o-center crack are unequal due to the loss of symmetry with respect to the bending plane of the pipe. In addition, the J-integral is larger, and hence, critical at the crack front which is farther away from the bending axis of the pipe. This is because, at that crack front, the tensile stress is larger and the component of the applied bending moment about the crack centerline has a further crack-opening eect. Also at this crack front, the J values can be lower or slightly higher than those of a symmetrically centered crack, depending on the crack size and o-centered angle. For the crack front that is closer to the bending axis, the J values are always lower than those of a symmetrically centered crack. This implies that the load-carrying capacity of a pipe is usually larger for an o-center crack than that for a symmetrically centered crack. Finally, based on these ®nite element solutions, new analytical expressions of J-integral were developed for fracture analysis of pipes containing o-center cracks. 7

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Enhancement of J estimation for typical nuclear pipes with a circumferential surface crack under tensile load

et al. 2010

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This paper is to report enhancement of engineering J estimation for semi-elliptical surface cracks under tensile load. Firstly, limitation of the sole solution suggested by Zahoor is shown for reliable structural integrity assessment of thin-walled nuclear pipes. An improved solution is then developed based on extensive 3D FE analyses employing deformation plasticity theory for typical nuclear piping materials. It takes over the structure of the existing solution but provides new tabulated plastic influence functions to cover a wide range of pipe geometry and crack shape. Furthermore, to facilitate easy prediction of the plastic influence function, an alternative simple equation is also developed by using a statistical response surface method. The proposed H 1 values can be used for elastic-plastic fracture analyses of thin-walled pipes with a circumferential surface crack subjected to tensile loading.

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Assessment of short through-wall circumferential cracks in pipes. Experiments and analysis: March 1990--December 1994

Cited by 9 publications

References 0 publications

Probabilistic fracture mechanics for nonlinear structures

Probabilistic fracture mechanics for nonlinear structures

Elastic–plastic analysis of off-center cracks in cylindrical structures

Enhancement of J estimation for typical nuclear pipes with a circumferential surface crack under tensile load

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