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Metals 2017, 7(4), 140;

Advanced Plasticity Modeling for Ultra-Low-Cycle-Fatigue Simulation of Steel Pipe

School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
Department of Materials Engineering, KU Leuven, Kasteelpark Arenberg 44-Box 2450, 3001 Heverlee, Belgium
Department of Computer Science, KU Leuven, Celestijnenlaan 200A, 3001 Leuven, Belgium
OnderzoeksCentrum voor de Aanwending van Staal, Technologiepark 935, 9052 Zwijnaarde, Belgium
Authors to whom correspondence should be addressed.
Academic Editor: Myoung-Gyu Lee
Received: 5 March 2017 / Revised: 11 April 2017 / Accepted: 13 April 2017 / Published: 14 April 2017
(This article belongs to the Special Issue Advances in Plastic Forming of Metals)


Pipelines and piping components may be exposed to extreme loading conditions, for instance earthquakes and hurricanes. In such conditions, they undergo severe plastic strains, which may locally reach the fracture limits due to either monotonic loading or ultra-low cycle fatigue (ULCF). Aiming to investigate the failure process and strain evolution of pipes enduring ULCF, a lab-scale ULCF test on an X65 steel pipeline component is simulated with finite element models, and experimental data are used to validate various material modeling assumptions. The paper focuses on plastic material modeling and compares different models for plastic anisotropy in combination with various hardening models, including isotropic, linear kinematic and combined hardening models. Both isotropic and anisotropic assumptions for plastic yielding are considered. As pipes pose difficulty for the measurement of plastic properties in mechanical testing, we calibrate an anisotropic yield locus using advanced multi-scale simulation based on texture measurements. Moreover, the importance of the anisotropy gradient across thickness is studied in detail for this thick-walled pipeline steel. It is found that the usage of a combined hardening model is essential to accurately predict the number of the cycles until failure, as well as the strain evolution during the fatigue test. The advanced hardening modeling featuring kinematic hardening has a substantially higher impact on result accuracy compared to the yield locus assumption for the studied ULCF test. Cyclic tension-compression testing is conducted to calibrate the kinematic hardening models. Additionally, plastic anisotropy and its gradient across the thickness play a notable, yet secondary role. Based on this research, it is advised to focus on improvements in strain hardening characteristics in future developments of pipeline steel with enhanced earthquake resistance. View Full-Text
Keywords: plasticity modeling; kinematic hardening; plastic anisotropy; finite element simulation; ultra-low cycle fatigue; failure; strain evolution plasticity modeling; kinematic hardening; plastic anisotropy; finite element simulation; ultra-low cycle fatigue; failure; strain evolution

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Li, R.; Eyckens, P.; E, D.; Gawad, J.; Poucke, M.V.; Cooreman, S.; Bael, A.V. Advanced Plasticity Modeling for Ultra-Low-Cycle-Fatigue Simulation of Steel Pipe. Metals 2017, 7, 140.

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