End effects on elbows subjected to moment loadings

Rodabaugh, E.C.; Iskander, S.K.; Moore, Scott Emory

doi:10.2172/6768250

Cited by 9 publications

(12 citation statements)

References 15 publications

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“…As for the out-plane stress intensification factors, equations from literature 4,5,7 yield similar results, while the equation from literature [1][2][3] seems to be overly conservative, especially with increasing the D=T ratio.…”

Section: Stress Intensification Factorsmentioning

confidence: 73%

“…Comparison of the equations existing in the open literature against the experimental data presented in Table 2 is given in Figures 9 and 10. As evidenced, equations from literature [1][2][3]5,7 for in-plane stress intensification factors yield similar results, while the equation from literature 4 seems to be overly conservative, especially with increasing the D=T ratio.…”

Section: Stress Intensification Factorsmentioning

confidence: 82%

“…Comparison of the out-plane flexibility factors shows that the equations from literature 4,5 (long radius) can be used with relative accuracy, while equation from literature 5 pertaining to short 2 against various equations for out-plane stress intensification factor. radius elbows tends to fail completely in the higher D 2 =ðR Á TÞ range (above $150) since it shows a clear drop in calculated values.…”

Section: Stress Intensification and Flexibility Factorsmentioning

confidence: 98%

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Stress intensification factor, sustained stress index and flexibility factor analysis of large D/T elbows

Jaćimović

Ivančić

Stamenić

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Paper presents new equations for calculation of stress intensification factors, sustained stress indices and flexibility factors for large diameter-to-thickness ratio elbows (i.e.,[Formula: see text]). The proposed equations overcome the need for pipe stress engineers to use numerical analyses in order to evaluate the piping which falls outside of the scope of typically used piping design codes. Regression analysis of the newly proposed equations is based on an extensive numerical database developed specifically for purposes of this paper, alongside with the data (both numerical and empirical) found in the open literature. Proposed equations prove to be a better fit to the database than the existing equations and have been shown to be applicable not only for large pipes, but also for normal piping (having[Formula: see text]) typically found in industrial plants. In case of the adoption of the proposed procedure, it is implied that the proposed equations should be applied to all the bends within a piping system subject to the analysis and not only to the selected bends.

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Section: Stress Intensification Factorsmentioning

confidence: 73%

Section: Stress Intensification Factorsmentioning

confidence: 82%

Section: Stress Intensification and Flexibility Factorsmentioning

confidence: 98%

See 1 more Smart Citation

Stress intensification factor, sustained stress index and flexibility factor analysis of large D/T elbows

Jaćimović

Ivančić

Stamenić

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Here, some of the finite element results are compared with those presented by G. Thomson and J. Spence [6], results obtained using BENDPAC [7], and recommended values by E. C. Rodabaugh and S. E. Moore [8].…”

mentioning

confidence: 99%

“…Results presented in reference [8] used EPACA, a finite element package. By comparing the results, it is seen that BENDPAC gives consistently higher values for both flexibility factors and stress intensification factors.…”

mentioning

confidence: 99%

Letter to the Editor commenting on “Letter to the Editor commenting on ‘Maximum Stresses and Flexibility Factors of Smooth Pipe Bends With Tangent Pipe Terminations Under In-Plane Bending’” (Whatham, J. F., 1984, ASME J. Pressure Vessel Technol., 106, pp. 219–220)

Natarajan

1985

Journal of Pressure Vessel Technology

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issue of this journal) [7] on the subject of stress and flexibility factors of smooth pipe bends with tangent pipe terminations under in-plane bending. The aim of this letter is to bring it to notice that the foregoing problem was solved much earlier than the results reported using BENDPAC and to quantitatively give an overall view on the effect of the tangent pipe attachment to the elbow.A finite element program was developed [1] in 1971 (much earlier than BENDPAC), and the end restraint effects on flexibility and stress factors for various pipe factors and bend angles were studied and reported in [2]. Subsequently, this program was used to study elbows with end contraints subjected to out-of-plane moment [3] and internal pressure [4]. This program was modified to include variable thickness of the elbow wall due to manufacturing, and its effect on the flexibility of the elbow was also studied [5].

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Determination of Fourier expansion number for elasto-plastic analysis of piping systems using flexibility factor

Lee

et al. 2022

J Mech Sci Technol

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End effects on elbows subjected to moment loadings

Cited by 9 publications

References 15 publications

Stress intensification factor, sustained stress index and flexibility factor analysis of large D/T elbows

Stress intensification factor, sustained stress index and flexibility factor analysis of large D/T elbows

Letter to the Editor commenting on “Letter to the Editor commenting on ‘Maximum Stresses and Flexibility Factors of Smooth Pipe Bends With Tangent Pipe Terminations Under In-Plane Bending’” (Whatham, J. F., 1984, ASME J. Pressure Vessel Technol., 106, pp. 219–220)

Determination of Fourier expansion number for elasto-plastic analysis of piping systems using flexibility factor

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