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Monotonic, low-cycle fatigue and ultra-low cycle fatigue behaviours of the X52, X60 and X65 piping steels grades

Authors:

C.R. Pereira

INEGI, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; Faculty of Engineering of University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal
A.M.P. de Jesus

INEGI, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; Faculty of Engineering of University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

António A. Fernandes

INEGI, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal; Faculty of Engineering of University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal

George E. Varelis

PDL Solutions (Europe) Limited, 1 Tanners Yard, Hexham, Northumberland NE46 3NY, United Kingdom

Published in:  Journal of Pressure Vessel Technology ASME

Abstract:

Seismic actions, soil settlements and landslides, fluctuations in permafrost layers, accidental loads and reeling may be responsible for large plastic deformations and widespread yielding of pipelines, which may lead to damage or failure, either due to monotonic loading or due to cyclic plastic strain fluctuations of high amplitude and short duration (Ni <~100 cycles). The damage mechanisms associated to high intensity cyclic plasticity show a combination of distinct mechanisms from monotonic and low-cycle fatigue (LCF) (~100<Ni<~10000 cycles) damage regimes. This fatigue domain is often called ultra-low-cycle fatigue (ULCF) or extreme-low-cycle fatigue (ELCF), in order to distinguish it from LCF. Despite monotonic ductile fracture and LCF have been subjected to significant research efforts and a satisfactory level of understanding of these phenomena has been already established, ULCF is not sufficiently investigated nor understood. Consequently, further advances should be done since the data available in literature is scarce for this fatigue regime. In addition, ULCF tests are very challenging and there are no specific standards available in literature providing guidance. In this work, the performance of X52, X60 and X65 API steel grades under monotonic, LCF and ULCF loading conditions are investigated. An experimental program was carried out to derive monotonic, LCF and ULCF data for the three piping steel grades. Typical smooth geometries are susceptive to instability under ULCF tests. To overcome or minimize this shortcoming anti-buckling devices may be used in the ULCF tests. The use of notched specimens facilitates the deformation localization and therefore contributes to overcome the instability problems. However, the non-uniform stress/strain states raise difficulties concerning the analysis of the experimental data, requiring the use of multiaxial stress/strain parameters. Optical methods and non-linear finite element models were used to assess the strain and stress histories at critical locations, which are used to evaluate some existing damage models.

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Posted: 16th Jan 2016 in 'PDL Research and Collaboration'
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Keywords for: PDL Research and Collaboration | Monotonic, low-cycle fatigue and ultra-low cycle fatigue behaviours of the X52,

PDL, George Varellis, Seismic Actions, linear FEA, non- linear FEA, Finite Element Analysis, steel pipes, Fatigue , Steel , Pipes , Low cycle fatigue , Cycles , Damage , Stress , Fluctuations (Physics) , Deformation , Plasticity, PDL, PDL Group, PDL Solutions, reduce development costs, mitigate risk, engineering design analysis, consultancy services, Global dynamic analysis, Orcaflex, Finite Element Analysis, FEA, Computational Fluid Dynamics, CFD, Engineering Design, CAD, Multibody Dynamics, RecurDyn