Fatigue analysis of damaged steel pipelines under cyclic internal pressure

Pinheiro, Bianca; Pasqualino, Ilson Paranhos

doi:10.1016/j.ijfatigue.2008.09.006

Cited by 67 publications

(16 citation statements)

References 7 publications

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“…Strains may culminate in cracks or complete fractures after a number of cycles [2]. In the case of offshore pipelines, mechanical damage, such as fatigue [12], corrosion [24], dents [25] and gouges [26], depress their service life. Chronological failure begins with mechanical defects, which promotes the local stress concentration that leads to local stress exceeding yield strength, and finally degrades the load capacity.…”

Section: Overview Of Fatigue Life Assessmentmentioning

confidence: 99%

The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

2015

IJAERD

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Section: Overview Of Fatigue Life Assessmentmentioning

confidence: 99%

The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

2015

IJAERD

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“…It was assumed the plastic potential flow rule, the von Mises yield function and combined isotropic and kinematic hardening. A series of experiments, denting small‐scale steel pipe models, was carried out to evaluate the accuracy of the numerical results 18 …”

Section: Numerical Simulationsmentioning

confidence: 99%

“…A series of experiments, denting small-scale steel pipe models, was carried out to evaluate the accuracy of the numerical results. 18 The deformed geometry, obtained after the elastic return that follows the retrieval of the denting tool, was employed in the elastic simulation. Figure 2 shows typical FEM result of the deformed geometry and the von Mises stresses on the external surface of the dented region after the denting process.…”

Section: N U M E R I C a L S I M U L A T I O N Smentioning

confidence: 99%

Stress‐life fatigue assessment of pipelines with plain dents

Cunha

Pasqualino²,

Pinheiro³

2009

Fatigue Fract Eng Mat Struct

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A B S T R A C T This paper presents a new algorithm for assessing the fatigue life of dented pipelines.The proposed methodology was conceived according to the current stress-life fatigue theory and design practice: it employs S-N curves inferred from tensile test material properties and uses well established methodologies to deal with the stress concentration, the mean stress and the multi-axial stress state that characterizes a dented pipe. Finite element analyses are carried out to model the denting process and to determine the stress concentration factors of several pipe-dent geometries. Using dimensional analysis over the numerical results, a non-dimensional number to characterize the pipe-dent geometry is determined and linear interpolation expressions for the stress concentration factors of dented pipelines are developed. Fatigue tests are conducted with the application of cyclic internal pressure on small-scale dented steel pipe models. In view of the fatigue test results, the more appropriate S-N curve and mean stress criteria are selected.Keywords dented steel pipelines; fatigue test on pipes; high cycle fatigue; mean stress; stress concentration factors. N O M E N C L A T U R EB = non-dimensional dent geometric parameter b = S-N curve parameter C = S-N curve parameter D = pipe external diameter d = dent depth D i = denting tool diameter E = modulus of elasticity F s = design or safety factor for static strength F f = design or safety factor for fatigue strength K f = fatigue stress concentration factor K t = theoretical (geometric) stress concentration factor k a = surface condition modification factor L = dent length L i = denting tool length N = number of stress cycles to failure N e = number of stress cycles that characterize the endurance limit n = number of cycles that the part was submitted in a particular stress condition q = notch sensitivity factor S e = endurance limit of a standard test sample S e = endurance limit of a structural component S n = alternating stress that causes failure at N cycles S y = yield stress

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“…The results pointed out that increasing the dent length led to decrease the burst capacity. A new methodology to evaluate the fatigue life behaviour of dented pipes subjected to internal pressure has been examined by Pinheiro and Pasqualino [10]. It was found that strains tangent to the dent periphery were compressive whereas their perpendicular counterparts were tensile.…”

Section: Introductionmentioning

confidence: 99%

Mechanical response of a lined pipe under dynamic impact

Obeid

Alfano

Bahai

et al. 2018

Engineering Failure Analysis

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An experimental and numerical investigation on the mechanical response of a lined pipe (compound pipe) under a dynamic impact is presented. The influence of the impact energy has been studied in terms of the depth of the dent formed, and of the strains and residual stresses. To this end, a three-dimensional explicit dynamic non-linear finite element model has been developed and successfully validated against the results of impact-test experiments conducted on pipes made of AISI 10305 steel, with and without the AISI304 stainless steel liner. The validation was made by comparing numerically computed strains with those measured by strain gauges, as well as in terms of permanent deformation. The model is then utilized to evaluate the residual stresses, the amount of energy dissipation and the velocity of impact process as a function of different pipes (i.e. with or without liner) and of the free drop heights.

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Fatigue analysis of damaged steel pipelines under cyclic internal pressure

Cited by 67 publications

References 7 publications

The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

The Effect of Dent Under Fatigue Loading in Pressurized Pipeline: A Review

Stress‐life fatigue assessment of pipelines with plain dents

Mechanical response of a lined pipe under dynamic impact

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