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Research Papers: Gas Turbines: Structures and Dynamics

Thermomechanical Fatigue Crack Growth Modeling in a Ni-Based Superalloy Subjected to Sustained Load

[+] Author and Article Information
Erik Storgärds

Division of Solid Mechanics,
Linköping University,
Linköping SE-58183, Sweden
e-mail: erik.storgards@liu.se

Kjell Simonsson, Sören Sjöström

Division of Solid Mechanics,
Linköping University,
Linköping SE-58183, Sweden

Johan Moverare

Division of Engineering Materials,
Linköping University,
Linköping SE-58183, Sweden

1Corresponding author.

Contributed by the Structures and Dynamics Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 15, 2015; final manuscript received July 20, 2015; published online August 12, 2015. Editor: David Wisler.

J. Eng. Gas Turbines Power 138(1), 012503 (Aug 12, 2015) (7 pages) Paper No: GTP-15-1329; doi: 10.1115/1.4031158 History: Received July 15, 2015

Thermomechanical fatigue (TMF) crack growth modeling has been conducted on Inconel 718 with dwell time at maximum load. A history dependent damage model taking dwell damage into account, developed under isothermal conditions, has been extended for TMF conditions. Parameter determination for the model is carried out on isothermal load controlled tests at 550–650 °C for surface cracks, which later have been used to extrapolate parameters used for TMF crack growth. Further, validation of the developed model is conducted on a notched specimen subjected to strain control at 50–550 °C. Satisfying results are gained within reasonable scatter level compared for test and simulated number of cycles to failure.

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Figures

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Fig. 1

Test specimen for the TMF crack growth, dimensions in mm

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Fig. 2

Nominal stress versus time for test 10:2 (a 360 min test), indication of damage by the sustained load and load reversal, respectively. A zoom in on a load reversal area is also included.

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Fig. 3

Fitted material parameters for the TMF expansion

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Fig. 4

Front evolution and crack path for the predicted corner crack. (a) TMF specimen mesh, (b) zoom in on cracked area, and (c) predicted crack fronts with fitted crack path.

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Fig. 5

Scatter for the model versus test results

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