Fatigue crack propagation analysis for multiple weld toe cracks in cut-out fatigue test specimens from a girth welded pipe

Pang, J.H.L.; Hoh, Hsin Jen; Tsang, Kin Shun; Low, J.O.; Kong, Shawn Caleb; Yuan, Wen

doi:10.1016/j.ijfatigue.2016.09.011

Cited by 27 publications

(13 citation statements)

References 25 publications

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“…The Elastic Modulus of 210 GPa and a Poisson's ratio of 0.3 for the steel material was used. The model is for a four-point bend fatigue specimens reported by Pang et al [10]. The dimensions of the steel plate are shown in Table 2.…”

Section: Modelling Proceduresmentioning

confidence: 99%

“…For the fatigue life prediction, the material was modeled following X65 steel, similar to a previous experiment [10]. The yield strength and ultimate tensile strength of the base material was obtained via relation to hardness (σ Y = 550 and UTS = 633 MPa).…”

Section: Fatigue Life Predictionmentioning

confidence: 99%

“…The SIFs of plain plates obtained by Newman and Raju [12] are used in the analysis. The locations of each crack initiation sites were reported in Pang et al [10]. The loading type applied was bending, at a load of 320MPa.…”

Section: Fatigue Life Predictionmentioning

confidence: 99%

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Influence of Weld Toe Radii on Fatigue Life Prediction

2018

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Abstract.A study was carried out to investigate the influence of the weld toe radii on the fatigue strength of butt welded joints loaded in bending and tension. Fatigue analysis starting from weld toe cracks in marine and offshore welded pipe specimens were conducted using cut-out four-point bend fatigue test specimens. Fatigue life can be enhanced by reducing the local stress concentration generated by weld toe radius effects. This study investigated the effect of different weld toe radii on the stress intensity factor at the region of the weld toe through Finite Element Analysis (FEA). FEA was used to model a butt welded steel plate extracted from a pipe subject to tension and four-point bend loading. Semi-elliptical surface (SESC) cracks were modeled at the weld toe region with different SESC crack depth and surface crack length. Four weld toe radii and two modes of loading were investigated. The stress intensity factors, weald toe magnification factors, or M kc and M ka are reported and used for fatigue life prediction.

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Section: Modelling Proceduresmentioning

confidence: 99%

Section: Fatigue Life Predictionmentioning

confidence: 99%

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Influence of Weld Toe Radii on Fatigue Life Prediction

2018

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“…Welded X65 offshore pipes with an outer diameter of 32" and 1" wall thickness were cut into fatigue coupons and tested in four-point bending (Pang et al, 2017). Tensile stresses occur at pipe outer surface of the weld cap.…”

Section: Arc-welded and Laser Welded Jointsmentioning

confidence: 99%

Report of Committee III.2: Fatigue and fracture

2015

Ships and Offshore Structures XIX

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“…In prior testing [1], butt-welded X65 offshore pipes (outer diameter 32" and 1" thickness) were cut into fatigue coupons (t= 25.4 mm, b= 100 mm). A four-point bending test (L= 240 mm, l= 120 mm) was setup ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Failure Assessment Diagram (FAD) analysis of fatigue test results for X65 welded joints

2018

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Abstract. Offshore pipelines transfer oil and gas from seabed to production facility on the surface. The long pipelines are formed by welding of pipe segments, where these welded joints are a source of stress concentration and defects from which fatigue cracks can grow. This work aims to study the behaviour of deep fatigue cracks. In this current work, finite-element based on a parametric study of four-point bending is used to assess the stress intensity factors (SIFs) of deep surface cracks in X65 specimens, while considering local limit load the remaining load bearing ligament. These deep cracks take on a non-regular shape and have widths that exceed that of the specimen. They will be compared to empirical expressions from derived standards such as British Standards BS7910, which may be more conservative. The existing large flaw is also assessed via the failure assessment diagram (FAD). The effects of limit load solutions and reference stresses used to determine the FAD diagram will be discussed.

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Fatigue crack propagation analysis for multiple weld toe cracks in cut-out fatigue test specimens from a girth welded pipe

Cited by 27 publications

References 25 publications

Influence of Weld Toe Radii on Fatigue Life Prediction

Influence of Weld Toe Radii on Fatigue Life Prediction

Report of Committee III.2: Fatigue and fracture

Failure Assessment Diagram (FAD) analysis of fatigue test results for X65 welded joints

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