Alternative Compressive Strain Capacity Performance Limits for Strain Based Design Applications

Kenny, Shawn; Gordon, Robin; Swank, Greg

doi:10.1115/ipc2016-64359

Cited by 2 publications

(4 citation statements)

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“…local buckle waveform), which is consistent with recent studies on the local buckling response of energy pipelines (e.g. Fatemi and Kenny, 2017;Kenny et al, 2016). The ovalization data also indicates the buckling mechanism remains localized at the pipe mid-length section (i.e.…”

Section: Influence Of Essential Boundary Conditions and Defect Gap Lesupporting

confidence: 90%

“…In reference to recent studies on the local buckling of energy pipelines, the near zero pipe ovality at the 1.0D section suggest the mechanical response is over-constrained by the pipe length and end boundary conditions (e.g. Fatemi and Kenny, 2017;Kenny et al, 2016), which has a significant moderating effect on the local buckling response. The influence of pipe length on the liner mechanical response is addressed later in this thesis study.…”

Section: Influence Of Essential Boundary Conditions and Defect Gap Lementioning

confidence: 88%

“…The significance of pipe length and end boundary conditions on the local buckling response of energy pipelines has been demonstrated in recent studies (e.g. Fatemi et al, 2007;Kenny et al, 2016).…”

Section: Numerical Modelling Studiesmentioning

confidence: 94%

“…Physical modelling and numerical simulation studies on the local buckling response of high strength steel pipe suggest the anisotropic behaviour of the CIPP liner may trigger bifurcation mechanisms in the longitudinal direction through interaction between the axial and circumferential mode response when subject to combined loads of internal pressure and bending (e.g. Fatemi and Kenny, 2017;Kenny et al, 2016). Brown et al, (2014) used continuum FEA to examine the performance of the CIPP liner for LS3, as defined by Allouche et al, (2005).…”

Section: Introductionmentioning

confidence: 99%

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Numerical Assessment on the Mechanical Performance of Pressure Pipe CIPP Liner with Local Defects in the Outer Host Pipe

He¹

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Due to technical, economic and logistical factors, cured in place pressure pipe (CIPP) liner systems have become one of the preferred options to rehabilitate damaged, ageing water pipe. There is a need to better understand the mechanical performance and limit states of the CIPP liner across a range of practical design parameters. In this study, the three-dimensional continuum finite element analysis was conducted to assess the effects of local defects in the host pipe on the mechanical performance of the CIPP liner subject to internal pressure, axial deformation and flexure loading conditions. For a CIPP liner subject to internal pressure with local circular void defects in the host pipe, the limit state was governed by axial tension when the defect diameter to CIPP diameter (d/D) ratio was greater than 0.4. A yield response was observed for the higher liner diameter to wall thickness ratios (D/t > 60) and hoop stress to yield ratios (σh/σy ≥ 0.6). The effects of a circumferential gap defect on the CIPP liner mechanical response were evaluated. For internal pressure loading, the longitudinal distribution of normalized radial displacement for the CIPP liner was primarily influenced by the width of the circumferential gap defect width to CIPP liner diameter (g/D) and the CIPP D/t ratio. The CIPP liner mechanical performance with circumferential gap defects in the host pipe when subject to internal pressure and pipe rotation was also investigated. The defect gap ratio (g/D) had an impact on the CIPP liner deformation pattern. The host pipe/CIPP liner interface friction coefficient had a negligible effect due to the mobilization of a virtual anchor. iii Co-authorship This thesis contains material prepared in the manuscript format. The principal investigator was Xiaoan He where he was the primary responsible person to define the problem statement, establish the analysis matrix used in the parameter study, develop the numerical modelling procedures, conduct the numerical simulations, and report on the data synthesis, analysis and conclusions. Guidance, mentorship and editorial support was

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Section: Influence Of Essential Boundary Conditions and Defect Gap Lesupporting

confidence: 90%

Section: Influence Of Essential Boundary Conditions and Defect Gap Lementioning

confidence: 88%

Section: Numerical Modelling Studiesmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Numerical Assessment on the Mechanical Performance of Pressure Pipe CIPP Liner with Local Defects in the Outer Host Pipe

He¹

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Parameters Affecting the Local Buckling Response of High Strength Linepipe

Fatemi

Kenny

2017

Journal of Offshore Mechanics and Arctic Engineering

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The local buckling response and post-buckling mechanical performance of high strength linepipe subject to combined loading state was evaluated using the finite element (FE) simulator abaqus/standard v6.12. The constitutive model parameters were established through laboratory tests and the numerical modeling procedures were verified with large-scale experiments investigating the local buckling response of high strength linepipe. The numerical predictions demonstrated a high level of consistency and correspondence with the measured experimental behavior with respect to the peak moment, strain capacity, deformation mechanism, and local buckling response well into the postyield range. A parametric study on the local buckling response of high strength plain and girth weld pipelines was conducted. The loading conditions included internal pressure and end rotation. The pipe mechanical response parameters examined included moment–curvature, ovalization, local strain, and modal response. The magnitude and distribution of the characteristic geometric imperfections and the end constraint, associated with the boundary conditions and pipe length, had a significant influence on the predicted local buckling response. The importance of material parameters on the local buckling response, including the yield strength (YS), yield strength to tensile strength ratio (Y/T), and anisotropy, was also established through the numerical parameter study. For girth weld linepipe, the study demonstrated the importance of the local high/low misalignment, associated with the circumferential girth weld, on the local buckling response.

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Alternative Compressive Strain Capacity Performance Limits for Strain Based Design Applications

Cited by 2 publications

References 0 publications

Numerical Assessment on the Mechanical Performance of Pressure Pipe CIPP Liner with Local Defects in the Outer Host Pipe

Numerical Assessment on the Mechanical Performance of Pressure Pipe CIPP Liner with Local Defects in the Outer Host Pipe

Parameters Affecting the Local Buckling Response of High Strength Linepipe

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