Numerical simulation of ratcheting and fatigue behaviour of mitred pipe bends under in-plane bending and internal pressure

Zhang, Dongliang; Wood, JodiAnne T.; McCormack, Ross; Hamilton, Robert

doi:10.1016/j.ijpvp.2012.11.003

Cited by 15 publications

(3 citation statements)

References 12 publications

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“…The purpose to analysis bend forming simulation result is optimize the process parameter and reveal the deformation regularity [10][11][12]. The bend forming quality is mainly depends on the wall thickness reduction and wall thickening of bend forming.…”

Section: Test Methods For Parameter Optimizationmentioning

confidence: 99%

Research On Optimization In NC Bending Process Of Thin-walled Tube Based on Orthogonal Experiment

Sheng-Le¹,

Wang²,

Dai³

2015

IJHIT

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In the process of research and development of tube bending forming technology, the way of improving the forming quality and establishing the optimization of forming process parameters has become an important problem that should be solved quickly. This text simulated the process of bend forming with the way of finite element, combined with the effects of geometric and physical parameters on the forming quality of bending pipe, taking the important parameters which are measurements of the pipe wall thickness variation as test indexes, made the virtual orthogonal experiment and gained the laws of the bending angle, relative bending radius, relative wall thickness, thrust, pipe friction coefficient between mode have effects on the forming quality of wall thinning rate and wall thickening. Through the comprehensive analysis and additional test, obtained the optimal parameters values, improved the accuracy of simulation and the optimization results of orthogonal test, improved the quality of tube bending forming.

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Section: Test Methods For Parameter Optimizationmentioning

confidence: 99%

Research On Optimization In NC Bending Process Of Thin-walled Tube Based on Orthogonal Experiment

Sheng-Le¹,

Wang²,

Dai³

2015

IJHIT

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“…Numerical models with a nonlinear isotropic/kinematic hardening model were adopted to evaluate the effects of some key factors-such as the mean stress, loading regime, and material hardening properties-on the ratcheting response of a steel tube with a rectangular defect by Zeinoddini and Peykanu [30]. Finally, Li et al [31] studied the ratcheting behavior of a 90 • single unreinforced mitered pipe subjected to a cyclic in-plane closing moment with a non-zero mean value and constant internal pressure by means of experimental and numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

Ratcheting Simulation of a Steel Pipe with Assembly Parts under Internal Pressure and a Cyclic Bending Load

Yang

Dai

2019

Applied Sciences

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The ratcheting behavior of a steel pipe with assembly parts was examined under internal pressure and a cyclic bending load, which has not been seen in previous research. An experimentally validated and three dimensional (3D) elastic-plastic finite element model (FEM)-with a nonlinear isotropic/kinematic hardening model-was used for the pipe's ratcheting simulation and considered the assembly contact effects outlined in this paper. A comparison of the ratcheting response of pipes with and without assembly parts showed that assembly contact between the sleeve and pipe suppressed the ratcheting response by changing its trend. In this work, the assembly contact effect on the ratcheting response of the pipe with assembly parts is discussed. Both the assembly contact and bending moment were found to control the ratcheting response, and the valley and peak values of the hoop ratcheting strain were the transition points of the two control modes. Finally, while the clearance between the sleeve and the pipe had an effect on the ratcheting response when it was not large, it had no effect when it reached a certain value.

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“…During plant operation, the piping system is exposed to thermal and mechanical loads due to internal pressure, axial tension, global bending moment, combined internal pressure and bending moment. These induced loads are transmitted to the curved region, causing high stress level when compared to a straight pipe [1]. Further, during the forming process, the outer fibre of the pipe bends thin down when compared to the inner fibre, which leads to a phenomenon known as ovality and thinning [2][3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ovality in Inlet Pigtail Pipe Bends Under Combined Internal Pressure and In-Plane Bending for Ni-Fe-Cr B407 Material

Ramaswami¹,

Velmurugan²,

Rathanasamy³

2017

Archives of Metallurgy and Materials

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The present paper makes an attempt to depict the effect of ovality in the inlet pigtail pipe bend of a reformer under combined internal pressure and in-plane bending. Finite element analysis (FEA) and experiments have been used. An incoloy Ni-Fe-Cr B407 alloy material was considered for study and assumed to be elastic-perfectly plastic in behavior. The design of pipe bend is based on ASME B31.3 standard and during manufacturing process, it is challenging to avoid thickening on the inner radius and thinning on the outer radius of pipe bend. This geometrical shape imperfection is known as ovality and its effect needs investigation which is considered for the study. The finite element analysis (ANSYS-workbench) results showed that ovality affects the load carrying capacity of the pipe bend and it was varying with bend factor (h). By data fitting of finite element results, an empirical formula for the limit load of inlet pigtail pipe bend with ovality has been proposed, which is validated by experiments.

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Numerical simulation of ratcheting and fatigue behaviour of mitred pipe bends under in-plane bending and internal pressure

Cited by 15 publications

References 12 publications

Research On Optimization In NC Bending Process Of Thin-walled Tube Based on Orthogonal Experiment

Research On Optimization In NC Bending Process Of Thin-walled Tube Based on Orthogonal Experiment

Ratcheting Simulation of a Steel Pipe with Assembly Parts under Internal Pressure and a Cyclic Bending Load

Effect of Ovality in Inlet Pigtail Pipe Bends Under Combined Internal Pressure and In-Plane Bending for Ni-Fe-Cr B407 Material

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