Numerical Simulation of Creep Damage and Life Prediction of Superalloy Turbine Blade

Liu, Donghuan; Li, Haisheng; Liu, Yinghua

doi:10.1155/2015/732502

Cited by 17 publications

(15 citation statements)

References 40 publications

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“…The application of the described UPF using the temperature-dependent coefficients is presented in this section. Temperature is set to 750 K. The comparison between the experimental tests, the Norton-Damage model with constant parameters of (Liu et al, 2015) and the Norton-Damage model of this analysis is depicted in Fig. 3.…”

Section: Resultsmentioning

confidence: 99%

“…The temperature-dependent parameters allow the user to span over a wider range of (in particular to higher) temperatures, compared to those parameters of (Liu et al, 2015), which are optimized for 750 K only. As an example, creep strain and damage over time at three different temperatures and for an initial stress of 650 MPa are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Equation 7 is the most important and widely used formulation to predict the secondary creep and is known as Norton power law. Table 1 shows the values of C 1 , C 2 and C 4 for Inconel 718 according to (Liu et al, 2015) and based on creep test data (Li et al, 2010). Note that for these parameters, stress is expressed in MPa, temperature in K, and strain in units per hour.…”

Section: Numerical Methods Creep Modellingmentioning

confidence: 99%

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Creep-Damage Modelling for Micro Gas Turbine Combustion Chambers Lifetime Prediction

Cirigliano¹,

D'Souza²,

Grimm³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

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Micro Gas Turbines (MGTs) are nowadays largely used for electrical and thermal energy production in small buildings and households. Their reliability and compactness allow them to operate for thousands of hours with minimal maintenance. However, the long exposure at high temperatures in combustion chambers can promote creep, which can induce thermal fatigue and potential failure of these components. Creep-induced damage in MGTs has not yet been thoroughly investigated, due to the lack of numerical tools able to model these strongly coupled phenomena. This study presents the development of a Fortran-based subroutine integrated into ANSYS APDL. The code allows for a life assessment based on the Lemaitre- Chaboche creep damage model. Secondary creep and stress relaxation are modeled for the high-temperature resistant alloy Inconel718. A new set of temperature-dependent parameters for the Norton equation is provided, and the method to obtain these parameters from creep rupture tests is outlined. The model is validated and shows good agreement with experimental data. The subroutine correctly reproduces visco-plasticity, stress relaxation and damage under typical MGTs operating temperatures. This model constitutes the foundation of a life-assessment analysis for combustion chambers. The results highlight the impact of temperature and creep on the component’s life and the importance of integrating life assessment analysis into the preliminary design of combustion chambers.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Numerical Methods Creep Modellingmentioning

confidence: 99%

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Creep-Damage Modelling for Micro Gas Turbine Combustion Chambers Lifetime Prediction

Cirigliano¹,

D'Souza²,

Grimm³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

View full text Add to dashboard Cite

show abstract

“…However, it can be expected that more rapid creep deformation could be caused by the substantial substrate temperature rise resulting from TBC spallation. As creep is time dependent deformation that strongly depends on the blade temperature [48][49][50][51][52], an increase in accumulated blade elongation can be expected over time as a result of TBC spallation. Such an acceleration in creep would increase as the TBC defect is larger or located closer to the blade root where mechanical stresses are higher.…”

Section: Impact Of Tbc Defect Size and Location On Blade Deflection A...mentioning

confidence: 99%

Numerical assessment of blade deflection and elongation for improved monitoring of blade and TBC damage

Dyke

Nganbe

2021

Eng. Res. Express

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The reliability of turbine blades is largely maintained by damage tolerance approach based on monitoring and pre-set periodic inspections. This can result in unnecessary downtimes, premature part retirement and unforeseeable failures. Therefore, there is growing interest in systems that can reliably detect damages in real‐time. However, many current sensors are based on blade tip clearance and time of arrival. The first primarily correlates with relatively predictable long-term creep deformation and ensuing blade elongation, while the second can be related to blade deflection. Therefore, this research comparatively assesses the two parameters. For this purpose, TBC defects, representative for coating spallation, and notches, representative for blunted blade cracks, are investigated. Overall, the results suggest that the measurement of changes in axial deflection could show higher sensitivity to cracks and TBC defects, and therefore, constitutes a potential alternative for continuous monitoring with respect to unforeseeable rapidly growing blade damage. Moreover, TBC spallation seems more difficult to immediately detect as the ensuing changes in blade tip position are small. However, they cause changes in deflection that can switch from negative to positive as they are located closer to the blade root, which may allow to assess their location during monitoring. In contrast, critical cracks located close to the blade root can cause measurable changes in blade deflexion, potentially making their timely detection and continuous monitoring possible.

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“…Дослідження властивостей ДК зазвичай засновані на принципі суперпозиції Больцмана, який описує реакцію матеріалу на різні історії навантаження (ASTM D 1037-99;Liu et al, 2015). Принцип суперпозиції Больцмана говорить, що відгук матеріалу на дане навантаження не залежить від відгуку матеріалу на будь-яке навантаження, яке вже є на матеріалі (Ito et al, 2018).…”

Section: вступunclassified

Forecasting Durability of Wood Composites Based on Accelerated Tests

Kulman¹,

Boiko²,

Bugaenko³

et al. 2019

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Long-term strength and durability tests are long and laborious, therefore new accelerated test methods are constantly being offered. The aim of this study is to develop a method for predicting durability based on data obtained from standard short-term tests for bending strength. The forecasting method is based on the kinetic concept of the strength of solids. The experiments were carried out on samples of structural chipboards based on urea-formaldehyde resin. The significance level for the tensile strength and time to failure in the studied temperature range from 273 to 353 °K, as well as for the loading speed from 0.81 to 98.25 mm/min, was less than 0.05, which indicates that the influence temperatures and strain rates are statistically significant. The results showed that temperature had a more significant effect on the tensile strength than the strain rate. At the same time, their effect on the time to failure is almost the same. Studies have confirmed the hypothesis of a non-linear reaction of wood composites to external thermo-moistureforce effects. The reason for the nonlinearity is the result of the interaction of variable factors with each other, but this requires special further study. The created technique allows to significantly reduce the time required for testing. The data presented in the work allow us to verify the proposed mathematical model that describes the change in the long-term strength of composite materials on wood fillers (wood composites), as well as assess the influence of external factors on the strength characteristics of the composite during production and operation.

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Numerical Simulation of Creep Damage and Life Prediction of Superalloy Turbine Blade

Cited by 17 publications

References 40 publications

Creep-Damage Modelling for Micro Gas Turbine Combustion Chambers Lifetime Prediction

Creep-Damage Modelling for Micro Gas Turbine Combustion Chambers Lifetime Prediction

Numerical assessment of blade deflection and elongation for improved monitoring of blade and TBC damage

Forecasting Durability of Wood Composites Based on Accelerated Tests

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