H.Y. Li's research while affiliated with University of Birmingham and other places

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Publications (3)

A numerical study on the influence of grain boundary oxides on dwell fatigue crack growth of a nickel-based superalloy
Article
  • Sep 2021
A theoretical treatment on the oxide-controlled dwell fatigue crack growth of a γ’ strengthened nickel-based superalloys is presented. In particular, this study investigates the influence of an externally applied load and variations in the γ’ dispersion on the grain boundary oxide growth kinetics. A dislocation-based viscoplastic constitutive descr...
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The prediction of crack propagation in coarse grain RR1000 using a unified modelling approach
Article
  • Apr 2020
The polycrystalline nickel-base superalloy RR1000 is used as turbine rotor material in Rolls-Royce aero engines and has to withstand a wide variety of load and temperature changes during operation. In order to maximize the potential of the material and to improve component design, it is of great interest to understand, and subsequently be able to a...
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The effect of phase angle on crack growth mechanisms under thermo-mechanical fatigue loading
Article
  • Feb 2020
The current paper describes TMF crack growth behaviour in an advanced nickel-based superalloy. Changes in behaviour are examined which occur as a function of the phase angle between applied stress and temperature. The fractography of the failed specimens reveals changes from transgranular to intergranular growth between high and low phase angle tes...
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Citations

... As the aim of this paper is to quantify the effect of scatter in constitutive parameters to the obtained scatter in the predicted fatigue crack initiation life, the material data and response of the coarse-grained version of the powder-processed γ ′ -strengthened polycrystalline nickelbase superalloy RR1000 has been investigated, see e.g. Engel et al. [30]. The constitutive behaviour and the TMF crack initiation life, using a fatigue damage accumulation model, under a flight representative load cycle of this material has previously been modelled with success, see Leidermark et al. [20]. ...
Reference: Thermomechanical fatigue life due to scatter in constitutive parameters
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... [1][2][3][4][5][6][7][8][9] Moreover, the amount of these damages will change with the change of material type or loading path, which seriously affects the failure life of hightemperature equipment. [10][11][12] At present, modern aeroengines continue to pursue high thrust weight ratio, and their service reliability and safety need to be guaranteed; therefore, damage calculation and life assessment for MTMF have become a new hot issue. ...
Reference: Viscoplastic constitutive model considering strain rate sensitivity under multiaxial thermomechanical fatigue loading
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