Structural analysis of gas turbine blades made of Mo-Si-B under transient thermo-mechanical loads

Kauss, Olha; Tsybenko, Hanna; Naumenko, Konstantin; Hütter, Sebastian; Krüger, Manja

doi:10.1016/j.commatsci.2019.04.023

Cited by 25 publications

(14 citation statements)

References 11 publications

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“…In contrast to T loading, under pure CF loading and pure P loading the stresses increase from zero at the blade tip to a maximum at the root ( Figs 4d-e, 4g-h). CF loading causes only tensile stresses in the walls (Fig 4f) which decrease in the cross-sectional regions away from the x axis (also reported in [44]), as in these regions the body forces are inclined to the cross-sectional x-y plane. The bending nature of P loading is evidenced by the compressive and tensile stresses at the suction and pressure sides of the blade, respectively (Figs 4g-i) and by the fact that these stresses are largely localised at the external blade root fillet.…”

Section: Turbine Blade Stressesmentioning

confidence: 55%

“…We recognise that for single crystal blades, anisotropy and crystallographic effects can be important. To date, this has only been explored for conventional single wall blades without holes, with the main focus on crystallographic orientation effects [38] and creep-fatigue driven crystallographic slip mechanisms [39][40][41][42], while also taking into account the transient thermomechanical loading response [43][44][45]. The aim of the approach and simplifications adopted here is to provide important physical insights into the response of these new double wall systems and in the process answer questions 1-5 above.…”

Section: Introductionmentioning

confidence: 99%

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Multiscale analysis of thermomechanical stresses in double wall transpiration cooling systems for gas turbine blades

Skamniotis

Courtis

Cocks

2021

International Journal of Mechanical Sciences

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Section: Turbine Blade Stressesmentioning

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Multiscale analysis of thermomechanical stresses in double wall transpiration cooling systems for gas turbine blades

Skamniotis

Courtis

Cocks

2021

International Journal of Mechanical Sciences

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“…For material selection, the combined effect of thermal and mechanical loads is considered to evaluate the performance of each type of blade material. Nickel-based superalloys are commonly used for gas turbine blades [ 25 ]; however, molybdenum-based alloys such as Mo–17.5Si–8B and Mo–9Si–8B exhibited low stress and strain levels compared to nickel-based superalloy CMSX-4 when subjected to thermomechanical loads, as reported by [ 26 ]. Turbine blades are internally cooled by the air spilled from compressor and sent into the internal channels to reduce the heat from the surface of the blades.…”

Section: Introductionmentioning

confidence: 99%

Vibration-Based Fatigue Analysis of Octet-Truss Lattice Infill Blades for Utilization in Turbine Rotors

et al. 2022

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Vibration fatigue characteristics are critical for rotating machinery components such as turbine rotor blades. Lattice structures are gaining popularity in engineering applications due to their unique ability to reduce weight and improve the mechanical properties. This study is an experimental investigation of octet-truss lattice structure utilization in turbine rotor blades for weight reduction and to improve vibration fatigue characteristics. One completely solid and three lattice infilled blades with variable strut thickness were manufactured via additive manufacturing. Both free and forced experimental vibration analyses were performed on the blades to investigate their modal and vibration fatigue characteristics. The blades were subjected to random vibration using a vibration shaker. The response was measured using a triaxial accelerometer in terms of vibration acceleration time histories in the X, Y, and Z directions. Results indicate a weight reduction of up to 24.91% and enhancement in the first natural frequency of up to 5.29% were achieved using lattice infilled blades. The fatigue life of the blades was investigated using three frequency domain approaches, namely, Lalanne, Dirlik and narrow band. The fatigue life results indicate that the 0.25 mm lattice blade exhibits the highest fatigue life, while the solid blade exhibits the lowest fatigue life of all four blades. The fatigue life of the 0.25 mm lattice blade was 1822-, 1802-, and 1819- fold higher compared to that of the solid blade, using the Lalanne, Dirlik, and narrow-band approaches, respectively. These results can serve as the first step towards the utilization of lattice structures in turbine blades, with thermal analysis as the next step. Therefore, apart from being light weight, the octet-truss lattice infilled blades exhibited superior vibration fatigue characteristics to vibration loads, thereby making them a potential replacement for solid blades in turbine rotors.

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“…However, the development of new alloys is extremely time-and cost-consuming. To reduce the costs required for experimental analysis, multi-scale modeling of materials behavior and structural analysis of components of creep behavior can be performed [22][23][24]. In addition, appropriate creep models are required for the structural analysis of turbine blades.…”

Section: Introductionmentioning

confidence: 99%

Temperature Resistance of Mo3Si: Phase Stability, Microhardness, and Creep Properties

Kauss

Obert

Bogomol

et al. 2021

Metals

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Mo-Si-B alloys are one of the most promising candidates to substitute Ni based superalloys in gas turbines. The optimization of their composition can be achieved more effectively using multi-scale modeling of materials behavior and structural analysis of components for understanding, predicting, and screening properties of new alloys. Nevertheless, this approach is dependent on data on the properties of the single phases in these alloys. The focus of this investigation is Mo3Si, one of the phases in typical Mo-Si-B alloys. The effect of 100 h annealing at 1600 °C on phase stability and microhardness of its three near-stoichiometric compositions—Mo-23Si, Mo-24Si and Mo-25Si (at %)—is reported. While Mo-23Si specimen consist only of Mo3Si before and after annealing, Mo-24Si and Mo-25Si comprise Mo5Si3 and Mo3Si before annealing. The latter is then increased by the annealing. No significant difference in microhardness was detected between the different compositions as well as after annealing. The creep properties of Mo3Si are described at 1093 °C and 1300 °C at varying stress levels as well as at 300 MPa and temperatures between 1050 °C and 1350 °C. Three constitutive models were used for regression of experimental results—(i) power law with a constant creep exponent, (ii) stress range dependent law, and (iii) power law with a temperature-dependent creep exponent. It is confirmed that Mo3Si has a higher creep resistance than Moss and multi-phase Mo-Si-B alloys, but a lower creep strength as compared to Mo5SiB2.

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Structural analysis of gas turbine blades made of Mo-Si-B under transient thermo-mechanical loads

Cited by 25 publications

References 11 publications

Multiscale analysis of thermomechanical stresses in double wall transpiration cooling systems for gas turbine blades

Multiscale analysis of thermomechanical stresses in double wall transpiration cooling systems for gas turbine blades

Vibration-Based Fatigue Analysis of Octet-Truss Lattice Infill Blades for Utilization in Turbine Rotors

Temperature Resistance of Mo3Si: Phase Stability, Microhardness, and Creep Properties

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