3D-VCCT based fracture analysis method for gas pipelines with multiple cracks

Anlin, Yao; He, Wei; Xu, Taolong; Jiang, Hongye; Gu, Danan

doi:10.1016/j.ngib.2019.03.005

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…Based on the numerical simulation method of the virtual crack closure technique (VCCT), Cui et al [25] investigated the effect of inter-crack spacing and size on the inter-crack interactions for double crack interactions in pipeline welds. Based on the 3D virtual crack closure technology (3D-VCCT), Yao et al [26] studied the effect of auxiliary crack location and size on the stress intensity factor of the leading edge of the main crack. Hamzah et al [27] investigated the multi-crack interactions in bonded dissimilar materials, and the results showed that the crack stress intensity factor depends largely on the elastic constants ratio, crack size, crack spacing and size, and the crack stress intensity factor, crack geometry, the distance between each crack, and the distance between the crack and the boundary.…”

Section: Introductionmentioning

confidence: 99%

Calculation of Stress Intensity Factor for Annular Double Cracks on Inner Surface of Pipeline

Cui,

Li,

et al. 2024

Coatings

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Cracks in engineered pipelines often appear in the form of multiple cracks or crack clusters with interactions between them. It is important to study the interaction between cracks if the pipeline crack cluster is to be evaluated in terms of equivalence and safety assessment. In this paper, based on FRANC3D crack analysis software, the interaction between circumferential parallel double cracks on the inner surface of pipelines was investigated, the factors affecting the interaction were examined, and the empirical equations for calculating the stress intensity factor (SIF) of double cracks was proposed. The results show that if there is no bias between the double cracks, the crack leading edge is shielded, but if there is offset between the double cracks, the crack leading edge is subjected to different interactions at different locations. The distal end of the cracks is generally strengthened, while the proximal end of the cracks is probably more shielded. The interaction effects between cracks are dependent on their relative positions rather than the pipe size or concerned crack size. According to the numerical simulation, boundaries for shielding or enhancing interactions were obtained, and the stress intensity factor calculation equations were fitted.

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Section: Introductionmentioning

confidence: 99%

Calculation of Stress Intensity Factor for Annular Double Cracks on Inner Surface of Pipeline

Cui,

Li,

et al. 2024

Coatings

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“…FeifeDong et al [5] pointed out that reducing the diameter of pipelines and increasing the wall thickness and burial depth of pipelines can improve the ability of pipelines to resist impacts. Yao Anlin et al [6] established a model by ABAQUS to derive the location of the maximum equivalent force point distribution and stress propagation law for buried gas transmission pipelines. Xu Taolong et al [7] used LS-DYNA finite element software to derive the maximum equivalent force and distribution of the pipeline produced by ramming load at different burial depths.…”

Section: Introductionmentioning

confidence: 99%

Strong ramming impact response law study of flange pipes

Fu,

Qiu,

Wang

et al. 2023

Ninth International Conference on Mechanical Engineering, Materials, and Automation Technology (MMEAT 2023)

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Investigation of the response law of the pipe under the strong ramming impact, numerical simulation with finite element software was used to analyze the dynamic response characteristics of the pipe without interface and the pipe with bolted connection flange, focusing on the dynamic response characteristics of the pipe with bolted flange connection. The results show that the vibration velocity of the pipe under strong ramming impact is symmetrically distributed in the pipe's center, and the pipe's center is the most dangerous area. With or without an interface ramming point from the center of the horizontal pipe distance of 4 m, no interface pipe and flange interface pipe stress maximum value appears in the lower left part of the side of the near ramming point, flange pipe pre-stress value when no interface pipe 5.93 times, so the study of flange interface to ensure the safe operation of the pipeline is of great significance.

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“…Among the finite element methods for studying crack growth, the virtual crack closure technique (VCCT) is one of the most widely used methods [17][18][19][20][21][22][23]. For example, Krueger outlined a few virtual crack closure techniques.…”

Section: Introductionmentioning

confidence: 99%

“…Yao et al investigated a 3D-VCCT-based fracture analysis method for multicracked gas pipelines. If the crack horizontal spacing is greater than six times the major semiaxis of the main crack, the interference between parallel collinear cracks and parallel offset cracks is negligible, and the analysis of multiple cracks can be simplified to a single crack in the process [20]. Based on the previous research work of the research group [24,25], this paper carried out the research on the interference problem of unequal-length cracks in the weld seam of X80 oil and gas pipeline, and the research results can provide theoretical basis for guiding the actual safety assessment of X80 pipeline with multiple cracks.…”

Section: Introductionmentioning

confidence: 99%

Modeling the Crack Interference in X80 Oil and Gas Pipeline Weld

et al. 2023

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Based on the numerical simulation method of the virtual crack closure technique (VCCT), an interference model was established to investigate the physical problem of two interacting cracks of different sizes in the welding zone of oil and gas pipelines. The obtained results of the current interference problem were compared with those of single crack case. Various crack configurations, such as different crack spacing and different crack sizes, were analyzed. The characteristic quantity fluid pressure load P during the crack propagation process, the peak value of the von Mises stress distribution field of the crack growth path, as well as the difference ∆Bx between the peak value of the magnetic induction intensity component at the crack and the value of the magnetic induction intensity component at its symmetrical position were calculated. The crack interaction scale factors, including γP, γMises, and γΔBx, were compared and analyzed. The numerical modeling results show that when the unequal-length double cracks interfere with each other, the cracks are more likely to propagate toward each other. The tendency of the double-cracks to propagate toward each other gradually weakens as the distance between the crack tips increases and is finally the same as that of single-crack cases. It was also found that the effect of large-sized cracks on small-sized cracks is greater than that of small-sized ones on large-sized ones. The numerical modeling results could be applied for the prediction and analysis of multicrack damage in oil and gas pipeline welds.

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3D-VCCT based fracture analysis method for gas pipelines with multiple cracks

Cited by 12 publications

References 7 publications

Calculation of Stress Intensity Factor for Annular Double Cracks on Inner Surface of Pipeline

Calculation of Stress Intensity Factor for Annular Double Cracks on Inner Surface of Pipeline

Strong ramming impact response law study of flange pipes

Modeling the Crack Interference in X80 Oil and Gas Pipeline Weld

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