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Research Papers: Materials and Fabrication

Investigation and Validation of Finite Element Analysis Material Modeling for Integrity Assessment of Indented Pipe Under Static and Cyclic Loading

[+] Author and Article Information
Husain M. Al-Muslim

e-mail: husain.muslim.2@aramco.com

Abul Fazal M. Arif

e-mail: afmarif@kfupm.edu.sa
Department of Mechanical Engineering,
King Fahd University of Petroleum and Minerals,
Dhahran 31261,
Saudi Arabia

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the Journal of Pressure Vessel Technology. Manuscript received March 14, 2010; final manuscript received September 14, 2012; published online March 18, 2013. Assoc. Editor: Spyros A. Karamanos.

J. Pressure Vessel Technol 135(2), 021401 (Mar 18, 2013) (10 pages) Paper No: PVT-10-1043; doi: 10.1115/1.4023415 History: Received March 14, 2010; Revised September 14, 2012

Mechanical damage in transportation pipelines is a threat to its structural integrity. There are many parameters that affect the severity of the mechanical damage which are related to the pipe geometry and material properties, the defect geometry and boundary conditions, the loading cycle, and the pipe state of stress. To understand those effects, the utilization of numerical finite element analysis (FEA) has been used extensively to supplement the expensive; and thus, limited full-scale tests. The actual pipe material exhibits a number of special features including nonlinear elasticity, anisotropy, and cyclic softening which need advanced material modeling techniques. However, the success of the numerical material model to actually simulate the pipe material behavior could not be studied in detail previously due to the insufficient experimental data especially in cyclic pressure loading. The objective of this paper is to investigate the effect of material modeling using FEA on the integrity assessment of dented pipe under static and cyclic loading by simulating pipe denting followed by subsequent pressure cycles. Several material models are tested and calibrated against the measurements of full-scale tests to find the effects of material modeling assumptions (e.g. isotropy, yield point, hardening rule). The results show that a combined material model simulating all special features of nonlinear elasticity, anisotropy, and cyclic softening gives a very close representation of experimental data in terms of strain values and fatigue cycles to failure. Therefore, detailed material properties are needed to conduct accurate integrity assessments of dented pipes especially under cyclic conditions.

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Figures

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Fig. 1

Schematics of pipeline dent

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Fig. 2

Cross-section of problem at the pipe midspan

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Fig. 3

Material properties: (a) Stress–strain curves of tensile specimen-full range, (b) stress–strain curves of tensile specimen-zoom at elastic and initial plastic portion, and (c) cyclic stress versus cyclic strain [16]

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Fig. 4

Quarter symmetry model of the pipe indentation FEA model (dimensions in millimeters)

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Fig. 5

Mesh of indentation problem: (a) overall and (b) finer mesh closer to indenter

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Fig. 6

Convergence check of Von Mises strains at the dent peak

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Fig. 7

Comparison of indentation load–displacement between FEA and experiment

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Fig. 8

Comparison of circumferential strain history between FEA runs and experimental results

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Fig. 9

Comparison of axial strain history between FEA runs and experimental results

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