Fast ductile fracture: Effect of inertia on propagation resistance and CTOA in pipe steels

Bassindale, Chris; Wang, Xin; Tyson, W. R.; Xu, Su

doi:10.1016/j.ijpvp.2020.104163

Cited by 9 publications

(7 citation statements)

References 7 publications

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“…The inertia effect brought by soil backfilling has a significant effect on the dynamic fracture behavior of pipelines. Bassindale 19 first assessed the effect of inertia on CTOA C by altering the density of the material used with the tensile plate model and found inertia has no significant effect on the measured CTOA. However, the maximum velocity in the tensile plate is about 20 m/s, which is far less than those measured in pipe fractures (about 300–400 m/s).…”

Section: Analysis Of Influencing Factors On Pipeline Ctoa Evolutionsmentioning

confidence: 99%

“…Zhu et al 18 used cohesive zone model (CZM) to simulate the evolution process of CTOA during crack propagation of buried pipeline and found that the CTOA C increases with the increase of internal pressure, which is inconsistent with Shibanuma's conclusion. Also using the CZM model, Bassindale et al 19 proved that CTOA has nothing to do with the inertia effect caused by soil backfilling through the simulation of crack propagation in large plates, but the crack velocity range studied is far less than that of the pipeline, so it is not clear whether pipeline CTOA has the same conclusion.…”

Section: Introductionmentioning

confidence: 99%

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Study on crack tip opening angle evolutions during dynamic crack propagation of pipelines

Zhen

Liu

Cao

et al. 2023

Fatigue Fract Eng Mat Struct

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Crack tip opening angle (CTOA) has been used to describe the arrest toughness of high‐grade pipelines. However, its evolutions and influencing factors during pipeline crack propagation are unclear. In view of this, this paper reproduces the full‐scale test using a numerical simulation method that is proven to be reliable. On this basis, the evolutions of CTOA during the dynamic crack propagation of the pipeline are systematically studied, and the effects on CTOA values are clarified. The results show that the critical CTOA of a pipeline is independent of the design factor, the pressure decompression, and the large change in the crack velocity and is also not sensitive to the pipe strength, pipe wall thickness, and the inertial effect of soil, but only related to the pipe diameter and pipe toughness. The above conclusions have laid a foundation for the subsequent establishment of the arrest control method for natural pipelines based on CTOA.

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Section: Analysis Of Influencing Factors On Pipeline Ctoa Evolutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on crack tip opening angle evolutions during dynamic crack propagation of pipelines

Zhen

Liu

Cao

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…The inertia effect brought by soil backfilling has a significant effect on the dynamic fracture behavior of pipelines. Bassindale 18 first assessed the effect of inertia on CTOA C by altering the density of the material used with the tensile plate model and found inertia has no significant effect on the measured CTOA. However, the maximum velocity in the tensile plate is ˜20 m/s, which is far less than those measured in pipe fractures (˜300-400 m/s).…”

Section: Effects Of the Inertia Backfill Effectmentioning

confidence: 99%

“…Zhu et al 17 used CZM to simulate the evolution process of CTOA during crack propagation of buried pipeline and found that the CTOA C increases with the increase of internal pressure, which is inconsistent with Shibanuma's conclusion. Bassindale et al 18 proved that CTOA has nothing to do with the inertia effect caused by soil backfilling through the simulation of crack propagation in large plates, but the crack velocity range studied is far less than that of the pipeline, so it is not clear whether pipeline CTOA has the same conclusion.…”

Section: Introductionmentioning

confidence: 99%

Study on CTOA evolutions during dynamic crack propagation of pipelines

Cao

Zhen

Liu

et al. 2022

Preprint

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：Crack Tip Opening Angle (CTOA) is considered and has been attempted to be used as a fracture parameter to describe the crack arrest toughness of ductile steel gas pipelines. However, its evolution and influencing factors during pipeline dynamic crack propagation are still unclear, and its use as a crack arrest toughness parameter similar to the Charpy impact toughness also lacks theoretical support. In view of the above problems, this paper reproduces the full-scale test with the help of the numerical simulation method for pipeline dynamic crack propagation. Comparing the numerical simulation results with the experimental ones, it is proved that the numerical model is reliable in studying the pipeline CTOA evolutions. On this basis, this paper systematically studies the evolution laws of CTOA in the process of dynamic crack propagation and arrest for natural gas pipelines, and clarifies the effects of the following factors on CTOA values, including the design factor, geometric dimensions, inertia backfill effect and material property of pipeline steel, et al. The results show that the critical CTOA (CTOA ) of a pipeline is independent of the design factor, the pressure decompression, and the large change in the crack velocity, and is also not sensitive to the pipe strength, pipe wall thickness, and the inertial effect of soil, but only related to the pipe diameter and pipe toughness. The above conclusions show that it is reasonable to use CTOA as the crack arrest toughness parameter and has laid a foundation for the subsequent establishment of the crack arrest control method for natural pipelines based on CTOA .

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“…The ductile fracture mechanics parameters for the cracked pipes subjected to internal pressure is important in structural integrity assessment of defective components [8][9][10]. The safety assessment of these structures and the comprehension of failure mechanisms are essential to study the reliability of pipelines for the liquid or gas transport [11][12][13][14]. Probabilistic fracture mechanics is a means of quantifying the failure probability resulting from uncertainties in the values of the parameters used to perform a failure assessment of cracked structures through probabilistic analysis techniques [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Numerical prediction of the ductile damage for axial cracks in pipe under internal pressure

Fezazi

Mechab

Salem

et al. 2021

Frattura Ed Integrità Strutturale

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This study presents a numerical prediction of the ductile damage for axial cracks in pipe subjected to internal pressure. The three dimensional finite element methods used to evaluate the J-integral. The effect of the external radius (Rext),the thickness (t), length crack (a) , the applied loads (P) and the crack position of the pipes has studied. The Monte Carlo method was used to determine the probabilistic characteristics of the J-integral. It’s also used later to predict the failure probability based on initiation of the crack growth. We note that the crack size and the geometries of the pipe are an important factor influencing on the durability of the pipe.

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Fast ductile fracture: Effect of inertia on propagation resistance and CTOA in pipe steels

Cited by 9 publications

References 7 publications

Study on crack tip opening angle evolutions during dynamic crack propagation of pipelines

Study on crack tip opening angle evolutions during dynamic crack propagation of pipelines

Study on CTOA evolutions during dynamic crack propagation of pipelines

Numerical prediction of the ductile damage for axial cracks in pipe under internal pressure

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