Elastic-plastic fracture response of multiple 3-D interacting cracks in offshore pipelines subjected to large plastic strains

Ariffin, Mohammad Zaidi; Zhang, Y.M.; Xiao, Zhong

doi:10.1016/j.engfailanal.2017.02.003

Cited by 9 publications

(5 citation statements)

References 26 publications

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“…As a counterpart, antishielding may occur when the crack approaches pores and rapidly connects with them . Such interaction between a growing crack and welding defects can not only drastically affect the short crack growth rate but also change the crack propagation path, depending on the distance from the crack tip to defect surface . Figure shows the FCG rate curves of three welded joints under the same welding parameter and loading condition.…”

Section: Experiments and Simulationsmentioning

confidence: 99%

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Song

Ding³

et al. 2019

Fatigue Fract Eng Mat Struct

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Defect or shrinkage is known to have a detrimental effect on the fatigue resistance of casting lightweight alloys and additively manufactured or 3D printed materials. However, very few works focus on the damage mechanism of fusion welded Al alloys due to gas pores or metallurgical defects. This paper performs an investigation on the effect of porosity on the damage evolution of laser hybrid welded 7020‐T651 alloys. The critical pore size comparable with average weld grain was assumed in terms of the population and dimension of micropores. To characterize the coupling effect between gas pores and cracks, an in situ fatigue testing rig was developed to well work at the synchrotron radiation tomography system. Combining synchrotron X‐ray microtomography and fatigue resistance testing, the pore size and location were correlated with the crack initiation and crack growth path but relatively less on the long crack propagation rate. Furthermore, the interaction between the porosity and stress concentration was elucidated by using finite element simulations, which shows that the gas pore appears to be a preferred cracking site especially near the surface.

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Section: Experiments and Simulationsmentioning

confidence: 99%

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Song

Ding³

et al. 2019

Fatigue Fract Eng Mat Struct

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show abstract

“…To improve the accuracy of pipeline failure prediction, it is necessary to study the effect of crack distance on crack interaction and crack propagation. 40 When the crack distance is short, the growth rate of the crack tip increases due to the interaction between cracks. With the decrease in the crack distance, the interaction between the cracks is more significant, and the crack can even develop into a penetrating crack in a short time, resulting in pipeline failure.…”

Section: Interaction Model Of Crack Propagationmentioning

confidence: 99%

“…28 When the distance is relatively long, the interaction between cracks is negligible. 40 In this case, the two cracks can be modeled as an independent propagation. 41 To quantitatively describe the changing trend of the interaction between cracks with the crack distance, Bai 37 obtained the stress intensity factors of multiple cracks in different crack distances with the help of ABAQUS software.…”

Section: Interaction Model Of Crack Propagationmentioning

confidence: 99%

“…To improve the accuracy of pipeline failure prediction, it is necessary to study the effect of crack distance on crack interaction and crack propagation. 40…”

Section: Pipeline Crack Initiation and Propagation Modelmentioning

confidence: 99%

“…28 When the distance is relatively long, the interaction between cracks is negligible. 40 In this case, the two cracks can be modeled as an independent propagation. 41…”

Section: Pipeline Crack Initiation and Propagation Modelmentioning

confidence: 99%

See 2 more Smart Citations

Pipeline reliability assessment and predictive maintenance considering multi-crack dependent degradation

Zheng,

Dong,

Zhang

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part B:

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Cracks due to corrosion are one of the main reasons for natural-gas pipeline leaks. Making the reliability assessment, prediction, and maintenance decision of pipelines based on measurable crack data is a central issue at present. The failure of pipelines is usually a result of the cumulative impact of multiple cracks. The interaction between adjacent cracks accelerates crack propagation, and greatly affects the degradation mechanism of pipelines. In this study, the reliability prediction and maintenance decisions were studied by considering the dependent degradation between multiple cracks in pipelines. Firstly, the initiation and propagation of pipeline cracks were modeled using a non-homogeneous Poisson process and a Gamma process, respectively. The interaction between cracks was defined to be a function of the random crack distance, which could be reflected by the change of shape parameters in the Gamma process. Secondly, the pipeline’s failure was defined as the competitive failure of the number of cracks, the maximum crack depth, and the total crack depth. The reliability prediction model of a pipeline under this failure mode was determined. A non-periodic combined maintenance policy considering both the pipeline condition and its predictive reliability was then proposed, and an optimal predictive maintenance decision model was constructed to minimize the long-term average cost rate. Finally, the effectiveness of the proposed model and policy was verified by a numerical experiment and a crack dataset of a transnational pipeline.

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Ultrasound classification of interacting flaws using finite element simulations and convolutional neural network

Niu

Srivastava

2022

Engineering with Computers

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Elastic-plastic fracture response of multiple 3-D interacting cracks in offshore pipelines subjected to large plastic strains

Cited by 9 publications

References 26 publications

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Fatigue behaviors of laser hybrid welded AA7020 due to defects via synchrotron X‐ray microtomography

Pipeline reliability assessment and predictive maintenance considering multi-crack dependent degradation

Ultrasound classification of interacting flaws using finite element simulations and convolutional neural network

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