Evaluation of postulated cross sections with ovality and thinning for 90° pipe bends with circumferential throughwall cracks subjected to in-plane closing bending

Sumesh, S.; Veerappan, Ar.; Shanmugam, S.

doi:10.1016/j.engfailanal.2016.12.021

Cited by 11 publications

(5 citation statements)

References 12 publications

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“…28 The magnitude of shape distortion can be calculated through the contour of the pipe bend's cross-section captured by the first off-trail test using equations (1) to (3). 27,29–35 To incorporate shape imperfection at the mid-section of pipe bends for building the FE geometry model, has been speculated as shown below. The mid-portion (A–A 1 ) of the pipe bend is presumed to be a perfect elliptical shape if ovality is present.…”

Section: Shape Distortions Of Pipe Bendsmentioning

confidence: 99%

Determination of bend angle and shape imperfection effect on collapse load of pipe bends under in-plane opening moment

Silambarasan

Veerappan

Shanmugam

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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This study uses a three-dimensional nonlinear finite-element method to investigate the effects of bend angle ([Formula: see text]) and shape imperfection on the collapse load of pipe bends subjected to in-plane opening bending moment using large displacement analysis. ABAQUS was used to create a pipe bend model, whereas by virtue of symmetry about the longitudinal axis, half of the pipe bend model was built. The bend angle was varied from 30° to 180° with an interval of 30°, and shape imperfections, namely ovality ( Co) and thinning ( Ct), were varied from 0% to 20% each at 5% intervals. Elastic-perfectly plastic is thought to be the material of choice for the pipe bend. The results show that the bend angle has a significant impact on the collapse load of pipe bends between 30° and 120°, after which a significant decline was observed. The ovality impact increases with an increase in bend angle for pipe bends with a large thickness, whereas the opposite effect was found for smaller thicknesses with a small bend radius. The effect of bend radius and thickness was significant for large bend angles. Thinning ( Ct) and thickening ( Cth) have no effect on collapse load. A new mathematical equation has been proposed to predict the integrated effect of bend angle and shape imperfection.

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Section: Shape Distortions Of Pipe Bendsmentioning

confidence: 99%

Determination of bend angle and shape imperfection effect on collapse load of pipe bends under in-plane opening moment

Silambarasan

Veerappan

Shanmugam

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Section: Shape Irregularitiesmentioning

confidence: 99%

“…The following assumptions were made to include shape imperfections in the pipe bend (Balakrishnan et al , 2019b; Buckshumiyan et al , 2013; Christo Michael et al , 2012b, 2012a, 2013, 2018; Sumesh et al , 2017). Mid-section of the pipe bend is presumed to be elliptical to include ovality, as depicted in Figure 1. Increase in intrados thickness is equal to the decrease in extrados thickness. Crown thickness of the pipe bend is equal to the nominal pipe thickness. The required C o and C t / C th are located at the middle of the pipe bends and it varies linearly to the end where the cross-section becomes circular.…”

Section: Shape Irregularitiesmentioning

confidence: 99%

Effect of structural deformations and bend angle on the collapse load of pipe bends subjected to in-plane closing bending moment

Silambarasan

Veerappan

Shanmugam

2021

WJE

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Purpose The purpose of this study is to investigate the effect of structural deformations and bend angle on plastic collapse load of pipe bends under an in-plane closing bending moment (IPCM). A large strain formulation of three-dimensional non-linear finite element analysis was performed using an elastic perfectly plastic material. A unified mathematical solution was proposed to estimate the collapse load of pipe bends subjected to IPCM for the considered range of bend characteristics. Design/methodology/approach ABAQUS was used to create one half of the pipe bend model due to its symmetry on the longitudinal axis. Structural deformations, i.e. ovality (Co) and thinning (Ct) varied from 0% to 20% in 5% steps while the bend angle (ø) varied from 30° to 180° in steps of 30°. Findings The plastic collapse load decreases as the bend angle increase for all pipe bend models. A remarkable effect on the collapse load was observed for bend angles between 30° and 120° beyond which a decline was noticed. Ovality had a significant effect on the collapse load with this effect decreasing as the bend angle increased. The combined effect of thinning and bend angle was minimal for the considered models and the maximum per cent variation in collapse load was 5.76% for small bend angles and bend radius pipe bends and less than 2% for other cases. Originality/value The effect of structural deformations and bend angle on collapse load of pipe bends exposed to IPCM has been not studied in the existing literature.

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“…Sumesh et al 2017 examine the bend cross section with having ovality and thinning for 90o bend pipe with having crack. The crack has been considered due to structural distortion.…”

Section: Mathematical Modelingmentioning

confidence: 99%

A Review on Heat Transfer and Fluid Flow within U-pipe and Bend Pipe

2017

IJRTER

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Abstract-This paper focuses on extensive literature review in the field of heat transfer and fluid flow within the U pipe or bends Pipe. Several researchers have examined the fluid flow characteristics experimentally as well as computationally. Pipes are extensive been used in various application from day to day life to various engineering marvels. Within the pipe when fluid flows, due to friction various losses takes place which affects the hydrodynamics as well as thermo hydrodynamics performance. At turbulent flow, the flow within these bend pipes have high significance in terms of secondary flow or flow separation. Researcher examined these flow characteristics and developed various empirical correlations which are particularly been used in exploring other engineering application.

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Evaluation of postulated cross sections with ovality and thinning for 90° pipe bends with circumferential throughwall cracks subjected to in-plane closing bending

Cited by 11 publications

References 12 publications

Determination of bend angle and shape imperfection effect on collapse load of pipe bends under in-plane opening moment

Determination of bend angle and shape imperfection effect on collapse load of pipe bends under in-plane opening moment

Effect of structural deformations and bend angle on the collapse load of pipe bends subjected to in-plane closing bending moment

A Review on Heat Transfer and Fluid Flow within U-pipe and Bend Pipe

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