Application of the Cheng-Finnie method to the calculation of stress intensity factors in thin-walled pipes with long axial cracks with allowance for geometric nonlinearity

Оrynyak, І. V.; Yakovleva, E. S.; Rozgonyuk, V. V.

doi:10.1007/s11223-007-0051-z

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…Oryniak et al [12] proposed a model for assessing dent-crack defects based on the stress distribution in a dent with an axial crack lodged at its deepest point by treating the dent as a source of geometric nonlinearity. Bending stresses through the crack caused by the geometric nonlinearity were added to the stresses caused by the internal pressure and the sum used to calculate the stress intensity factor used to analyze crack propagation.…”

Section: Introductionmentioning

confidence: 99%

Crack Propagation and Burst Pressure of Pipeline with Restrained and Unrestrained Concentric Dent-Crack Defects Using Extended Finite Element Method

Okodi

Cheng

et al. 2020

Applied Sciences

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Mechanical damage in form of dents, cracks, gouges, and scratches are common in pipelines. Sometimes, these damages form in proximity of each other and act as one defect in the pipe wall. The combined defects have been found to be more injurious than individual defects. One of the combined defects in pipeline comprises of a crack in a dent, also known as dent-crack defect. This paper discusses the development of finite element models using extended finite element criterion (XFEM) in Abaqus to predict burst pressure of specimens of API X70 pipeline with restrained and unrestrained concentric dent-crack defects. The models are calibrated and validated using results of full-scale burst tests. The effects of crack length, crack depth, dent depth, and denting pressure on burst pressure are investigated. The results show that restrained dent-crack defects with shallow cracks (depth less than 50% wall thickness) inside dents do not affect pipeline operations at maximum allowable operating pressure if crack lengths are less than 200 mm. Releasing restrained dent-cracks when the pressure is at maximum allowable operating pressure can cause propagation of deep cracks (depth of 50% wall thickness or more) longer than 60 mm. However, only very long cracks (200 mm and higher) propagate to burst the pipe. Cracks of depth less than 20% of wall thickness inside dents formed at zero pressure are not propagated by the maximum allowable operating pressure. Dent-crack defects having dents of depth less than 2% outside diameter of pipe behave as plain cracks if the dents are formed at zero denting pressure but are more injurious than plain cracks if the dents are formed in pressurized pipes.

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Section: Introductionmentioning

confidence: 99%

Crack Propagation and Burst Pressure of Pipeline with Restrained and Unrestrained Concentric Dent-Crack Defects Using Extended Finite Element Method

Okodi

Cheng

et al. 2020

Applied Sciences

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“…These solutions are used for thick-walled pipes. The approaches based on the lumped compliance method allow known SIF values to be used for a strip with edge crack in the analysis of other configurations of cracked bodies [15][16][17][18][19]. For instance, analytical solutions have been obtained for pipes with axial cracks (including multiple ones) and circumferential cracks and for pipe bend with axial cracks; this made it possible to study analytically for the first time the effect of bend geometry on the SIF value and to show their difference from the solutions for a straight pipe.…”

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confidence: 99%

Strength and reliability of piping systems

Krasovskii

Оrynyak

2010

Strength Mater

Self Cite

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A. Ya. Krasovskii and I. V. OrynyakUDC 539.3Analytical and numerical methods have been developed for the solution of stress-strain and limit state problems of piping systems (in the case of the presence of flaws in them as well). The fracture strength of pipe steels during long-term service has been studied. A methodology and a software have been developed for the assessment of stress-strain state to extend the life of active pipelines. The developments made are used to increase the reliability of Ukrainian piping systems.Introduction. Piping systems are widely used in various industries (main pipeline transport, thermal and nuclear power stations, chemical industry, metallurgy, etc). Such objects had been mainly built in the times of the former USSR on the basis of the existing technological policy. At the present time, ensuring of the serviceability of piping systems has gained strategic importance to Ukraine, especially considering the fact that the requirements for environmental protection and reduction of service risks have become much more stringent. For instance, the territory of Ukraine is traversed by gas mains (> 35,000 km), oil pipelines (> 8000 km) and an ammonia pipeline (> 1000 km), which have worked 25-40 years and in some cases 50 years and more. A similar situation exists in other industries that use piping systems. Therefore, the service safety, reliability and risk assessment of piping systems is topical both in terms of economy and in terms of ecology. The solution of the problems of improving methods for the strength analysis of new piping systems, extending the life of active piping systems and assessing the service risk of ageing piping systems is the main purpose of the work. In spite of many years of world research in this direction, many scientific questions remain unstudied. The constituents of this work are as follows.Development of analytical and numerical methods for the solution of stress-strain and limiting state problems of piping systems (in the case of the presence of flaws in them as well).Study of the fracture strength of pipe steels during long-term service. Development of a methodology and a software for the assessment of stress-strain state to extend the life of active pipelines.Use of the developments made to increase the reliability of Ukrainian piping systems. This article reviews the main works published by the authors in the past five years, which consider questions associated with the above-mentioned directions of research. The results obtained allow a considerable contribution to be made both to the development of the scientific fundamentals of the strength of pipelines and to the solution of specific problems of their service.In accordance with the above-mentioned four constituents of the work, below are set out the main results. Analytical and Numerical Methods. Severe service conditions of pipelines, which cannot be taken into account in their design, on the one hand and the development of computer engineering and formalized mathematical and software computing fac...

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A review on pipeline failures, defects in pipelines and their assessment and fatigue life prediction methods

Vishnuvardhan

Murthy²,

Choudhary³

2023

International Journal of Pressure Vessels and Piping

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Application of the Cheng-Finnie method to the calculation of stress intensity factors in thin-walled pipes with long axial cracks with allowance for geometric nonlinearity

Cited by 4 publications

References 9 publications

Crack Propagation and Burst Pressure of Pipeline with Restrained and Unrestrained Concentric Dent-Crack Defects Using Extended Finite Element Method

Crack Propagation and Burst Pressure of Pipeline with Restrained and Unrestrained Concentric Dent-Crack Defects Using Extended Finite Element Method

Strength and reliability of piping systems

A review on pipeline failures, defects in pipelines and their assessment and fatigue life prediction methods

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