Buckle propagation of pipe-in-pipe systems under external pressure

2015 ◽  
Vol 84 ◽  
pp. 207-222 ◽  
Author(s):  
Shunfeng Gong ◽  
Gen Li
Keyword(s):  
External Pressure ◽  
Buckle Propagation ◽  
Pipe Systems

Effects of Diameter to Thickness Ratio and External Pressure on the Velocity of Dynamic Buckle Propagation in Offshore Pipelines

2013 ◽  
Vol 135 (4) ◽  
Author(s):  
Z. Omrani ◽  
K. Abedi ◽  
A. R. Mostafa Gharabaghi
Keyword(s):  
Finite Element ◽  
Numerical Study ◽  
Element Model ◽  
External Pressure ◽  
Thickness Ratio ◽  
Small Scale ◽  
Element Analysis ◽  
Models Comparison ◽  
Buckle Propagation ◽  
Exerted Pressure

In this paper, a numerical study of the dynamic buckle propagation, initiated in long pipes under external pressure, is presented. For a long pipe, due to the high exerted pressure, local instability is likely to occur; therefore, the prevention of its occurrence and propagation are very important subjects in the design of pipelines. The 3D finite element modeling of the buckle propagation is presented by considering the inertia of the pipeline and the nonlinearity introduced by the contact between its collapsing walls. The buckling and collapse are assumed to take place in the vacuum. The numerical results of the nonlinear finite element analysis are compared with the experimental results obtained by Kyriakides and Netto (2000, “On the Dynamics of Propagating Buckle in Pipelines,” Int. J. Solids Struct., 37, pp. 6843–6878) from a study on the small-scale models. Comparison shows that the finite element results have very close agreement with those of the experimental study. Therefore, it is concluded that the finite element model is reliable enough to be used for nonlinear collapse analysis of the dynamic buckle propagation in the pipelines. In this study, the effects of external pressure on the velocity of dynamic buckle propagation for different diameter to thickness ratios are investigated. In addition, the mathematical relations, based on the initiation pressure, are derived for the velocity of buckle propagation considering the diameter to thickness ratio of the pipeline. Finally, a relation for the buckle velocity as a function of the pressure and diameter to thickness ratio is presented.

A Global Energy Approach for Analysis of a Propagating Buckle in Submarine Pipelines

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Mingqiao Tang ◽  
Jianghong Xue ◽  
Renhuai Liu
Keyword(s):  
Steady State ◽  
Transition Zone ◽  
Plastic Material ◽  
External Pressure ◽  
Thick Wall ◽  
Yield Coefficient ◽  
Rigid Plastic ◽  
Stretching Factor ◽  
Buckle Propagation ◽  
Membrane Stretching

This paper presents a unique approach to analyze the steady-state buckle propagation phenomenon in underwater pipelines. In previous work, we restudied the buckling of a very long pipeline subjected to external pressure and found that buckling happens only over a certain length of the pipeline. In this paper, the collapse mode of the pipeline obtained in previous studies is taken as the transition zone during steady-state buckle propagation. Kinematics in the transition zone is analyzed based on von Kármán–Donnell type of nonlinearity. Assuming linear elastic rigid plastic material properties, the mechanical responses in the transition zone are examined using the deformation theory. Two parameters, the yield coefficient and the membrane stretching factor, are introduced to depict the effects of transversal bending and the membrane stretching, respectively. Analytical solution of buckle propagation pressure is derived by considering the energy conversation calculated from shell theory. It is found that the buckle propagation performance is governed by the transversal bending, including the circumferential bending and longitudinal bending. The membrane stretching is significant only for thick wall pipeline, in particular when the ratio of radius-to thickness is small than ten. The analysis is in effect by comparing the obtained solutions with the well-established predictions and the experimental results.

Collapse and Buckle Propagation of Sandwich Pipes: A Review

2013 ◽  
Author(s):  
Chen An ◽  
Menglan Duan ◽  
Segen F. Estefen
Keyword(s):  
Failure Modes ◽  
Oil And Gas ◽  
Research Work ◽  
External Pressure ◽  
Mechanical And Thermal Properties ◽  
Structural Resistance ◽  
Buckle Propagation ◽  
Collapse Behavior ◽  
Elastoplastic Constitutive Model ◽  
Core Materials

Sandwich pipes (SP) can be an effective solution for ultra-deepwater submarine pipelines, combining high structural resistance with thermal insulation. Most research work on this subject has been conducted at the subsea technology laboratory (LTS) of COPPE/UFRJ, with the aim of developing qualified pipes to transport deepwater oil and gas, especially for the pre-salt reservoirs at Offshore Brazil. This article reviewed most of the research done in recent years (2002–2012) on the buckling, collapse and buckle propagation of SP, which emphasized on the development of theoretical, experimental and numerical methods adopted to analyze such structural behavior of SP with different core materials. The main mechanical and thermal properties of the previously considered core materials were also given, together with the elastoplastic constitutive model for each material. The experimental and numerical results of collapse and buckle propagation under external pressure for SP were summarized. A general discussion of the mechanical failure modes of SP under external pressure was also provided. Besides, some suggestions for future work on collapse behavior and buckle propagation of SP were given.

Buckle Propagation Analysis of Deep-Water Petroleum Transmission Pipelines with Axial Tension

2014 ◽  
Vol 1008-1009 ◽  
pp. 1134-1143 ◽  
Author(s):  
Sun Ting Yan ◽  
Yin Fa Zhu ◽  
Zhi Jiang Jin ◽  
Hao Ye
Keyword(s):  
Plastic Hinge ◽  
External Pressure ◽  
Isotropic Hardening ◽  
Rigid Plastic ◽  
Perfectly Plastic ◽  
Fitting Procedure ◽  
Plastic Materials ◽  
Buckle Propagation ◽  
Elastic Perfectly Plastic ◽  
Hinge Model

Quasi-static finite element simulation is carried out on buckle propagation phenomenon of offshore pipelines under external pressure. Arc-length method and volume-controlled static analysis by employing hydrostatic fluid element F3D4 are employed to calculate the steady buckle propagation pressure. After verifying the validity of numerical model, emphasis is on the influence of tension on propagation pressure considering isotropic hardening elastoplastic and elastic-perfectly plastic materials. Parametric study is conducted to include the effect of diameter-thickness ratio, after which two empirical equations are derived by curve fitting procedure. Finally, some comments on the results obtained through rigid-plastic hinge model are presented and a modified plastic hinge model including effect of material anisotropy is derived. The results can serve as a reference for more reasonable design of buckle arrestors.

BUCKLE PROPAGATION OF SANDWICH PIPES UNDER EXTERNAL PRESSURE

2021 ◽  
Vol 162 (A1) ◽  
Author(s):  
C An ◽  
B Q Liu ◽  
T T Li ◽  
G M Fu ◽  
M L Duan
Keyword(s):  
Numerical Simulation ◽  
Material Properties ◽  
Failure Modes ◽  
External Pressure ◽  
Finite Element Code ◽  
Geometric Characteristics ◽  
Python Programming Language ◽  
Buckle Propagation ◽  
Python Programming ◽  
Pressure Magnitude

Buckle propagation of local collapse appearing in the damaged pipes is one of the failure modes that are of particular interest for deepwater application. The local collapse can propagate along the pipeline for long distances in both directions when the external pressure magnitude is up to the propagation pressure. In this paper, the buckle propagation pressure of sandwich pipes (SP) with different material properties and geometric characteristics is investigated by numerical simulation using Python programming language based on general finite element code. The results of the pressure history data obtained are verified by comparing those published previously. The effect of material properties, geometric characteristics and adhesion conditions on the propagation pressure are analyzed.

On the flip-flop mode of dynamic buckle propagation in tubes under external pressure

2021 ◽  
pp. 101378
Author(s):  
Liang-Hai Lee ◽  
Stelios Kyriakides ◽  
Theodoro A. Netto
Keyword(s):  
External Pressure ◽  
Flip Flop ◽  
Buckle Propagation

On the Propagation of Bulges and Buckles

1984 ◽  
Vol 51 (2) ◽  
pp. 269-277 ◽  
Author(s):  
E. Chater ◽  
J. W. Hutchinson
Keyword(s):  
Steady State ◽  
Critical Pressure ◽  
External Pressure ◽  
Instability Mode ◽  
Instability Modes ◽  
Buckle Propagation ◽  
State Propagation

Two examples illustrate the propagation of instability modes under quasi-static, steady-state conditions. The first is the inflation of a long cylindrical party balloon in which a bulge propagates down the length of the balloon. The second is the collapse of a long pipe under external pressure as a result of buckle propagation. In each example, there is a substantial barrier to the initiation of the instability mode. Once initiated, however, the mode will not arrest if the pressure is in excess of the quasi-static, steady-state propagation pressure. It is this critical pressure that is determined in this paper for each of the two examples.

Buckle Propagation of Sandwich Pipes Under External Pressure

2020 ◽  
Vol 162 (A1) ◽  
Author(s):  
C An ◽  
B Q Liu ◽  
T T Li ◽  
G M Fu ◽  
M L Duan
Keyword(s):  
Numerical Simulation ◽  
Material Properties ◽  
Failure Modes ◽  
External Pressure ◽  
Finite Element Code ◽  
Geometric Characteristics ◽  
Python Programming Language ◽  
Buckle Propagation ◽  
Python Programming ◽  
Pressure Magnitude

Buckle propagation of local collapse appearing in the damaged pipes is one of the failure modes that are of particular interest for deepwater application. The local collapse can propagate along the pipeline for long distances in both directions when the external pressure magnitude is up to the propagation pressure. In this paper, the buckle propagation pressure of sandwich pipes (SP) with different material properties and geometric characteristics is investigated by numerical simulation using Python programming language based on general finite element code. The results of the pressure history data obtained are verified by comparing those published previously. The effect of material properties, geometric characteristics and adhesion conditions on the propagation pressure are analyzed.

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