Investigation on structural integrity of shape distorted 90° back-to-back pipe bends under in-plane closing bending moment

Vinothkumar, A.; Veerappan, Ar.; Shanmugam, S.

doi:10.1108/mmms-01-2022-0004

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…To consolidate irregularities in pipe bends, the following are derived from Figure 3 (Vinothkumar et al , 2022; Krishna et al , 2021; Silambarasan et al , 2021a): …”

Section: Pipe Bend With Shape Imperfectionsmentioning

confidence: 99%

Development of an improved limit pressure equation for structurally distorted thin-walled pressurized 90 degree pipe bends

Raghuraman

Veerappan

Shanmugam

2022

WJE

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Purpose This paper aims to present the approximate limit pressure solutions for thin-walled shape-imperfect 90° pipe bends. Limit pressure was determined by finite element (FE) limit analysis with the consideration of small geometry change effects. Design/methodology/approach The limit pressure of 90° pipe bends with ovality and thinning has been evaluated by geometric linear FE approach. Internal pressure was applied to the inner surface of the FE pipe bend models. When von-Mises stress equals or just exceeds the yield strength of the material, the corresponding pressure was considered as the limit pressure for all models. The current FE methodology was evaluated by the theoretical solution which has been published in the literature. Findings Ovality and thinning produced a significant effect on thin-walled pipe bends. The ovality weakened pipe bend performance at any constant thinning, while thinning improved the performance of the bend portion at any constant ovality. The limit pressure of pipe bends under internal pressure increased with an increase in the bend ratio and decreased with an increase in the pipe ratio. With a simultaneous increment in bend radius and reduction in wall thickness, there was a reduction in limit pressure. A new closed-form empirical solution was proposed to evaluate limit pressure, which was validated with published experimental data. Originality/value The influences of structural deformation (ovality and thinning) in the limit pressure analysis of 90° pipe bends have not been investigated and reported.

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“…To consolidate irregularities in pipe bends, the following are derived from Figure 3 (Vinothkumar et al , 2022; Krishna et al , 2021; Silambarasan et al , 2021a): …”

Section: Pipe Bend With Shape Imperfectionsmentioning

confidence: 99%

Development of an improved limit pressure equation for structurally distorted thin-walled pressurized 90 degree pipe bends

Raghuraman

Veerappan

Shanmugam

2022

WJE

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Development of an improved limit pressure solution for shape-distorted 90^o pipe bends with through-wall circumferential cracks

Raghuraman,

Veerappan,

Silambarasan

2024

MMMS

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PurposeThis paper presents the approximate limit pressure solution for shape-imperfect and through-wall circumferential cracked (TWCC) 90° pipe bends at the intrados region. Finite element (FE) limit analysis was used to estimate the limit pressure by considering the small geometrical change effects.Design/methodology/approachThree-dimensional (3D) geometric linear FE methodology was implemented to investigate the limit pressure of structurally deformed TWCC 90° pipe bends. The material considered in the analysis is elastic perfectly plastic (EPP). The limit pressure of TWCC shape-distorted pipe bends was predicted from the corresponding internal pressure when von-Mises stress was equal to or just exceeded the material’s yield strength for all the models. The theoretical solution which was published in the literature was used to evaluate the current FE approach.FindingsOvality Co and TWCC at the intrados region caused a considerable impact on pipe bends, while the thinning? Ct produced a negligible effect and hence was not included in the analysis. With the combined effect, the bend portion of pipe bend experiences substantial influence, and the TWCC effect consequently increases with 45o, 60o and 90o crack angles and decreases the limit pressure of pipe bends. An improved closed-form empirical limit pressure solution was proposed for TWCC shape-distorted pipe bends at the intrados region.Originality/valueIn the limit pressure analysis of 90° pipe bends, the implications of structural irregularities (ovality and thinning) and TWCC have not been examined and reported.

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Investigation on structural integrity of shape distorted 90° back-to-back pipe bends under in-plane closing bending moment

Cited by 2 publications

References 27 publications

Development of an improved limit pressure equation for structurally distorted thin-walled pressurized 90 degree pipe bends

Development of an improved limit pressure equation for structurally distorted thin-walled pressurized 90 degree pipe bends

Development of an improved limit pressure solution for shape-distorted 90^o pipe bends with through-wall circumferential cracks

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Investigation on structural integrity of shape distorted 90° back-to-back pipe bends under in-plane closing bending moment

Cited by 2 publications

References 27 publications

Development of an improved limit pressure equation for structurally distorted thin-walled pressurized 90 degree pipe bends

Development of an improved limit pressure equation for structurally distorted thin-walled pressurized 90 degree pipe bends

Development of an improved limit pressure solution for shape-distorted 90o pipe bends with through-wall circumferential cracks

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Development of an improved limit pressure solution for shape-distorted 90^o pipe bends with through-wall circumferential cracks