Damage tolerant design and test considerations in the engine structural integrity program

Cowie, W.; Stein, T.

doi:10.2514/6.1980-784

Cited by 4 publications

(2 citation statements)

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“…(4) that the random variable Z is log normal with the median value Z equal to unity, i.e., Z= 1.0. Thus, the deterministic crack growth rate equation (2) represents the median crack growth behavior, whereas the statistical variability of the crack growth rate is taken care of by the log normal random variable Z.…”

Section: = H 1 H 2 H 3 H 4 S Vmentioning

confidence: 99%

“…is approximately 11,500 cycles. 4 The crack growth data under the nominal loading spectrum (S= 1.0) are best fitted by the crack growth rate equation (2) with the result, £> = 4.22x 10~4 and £=1.2914. On the basis of other experimental data, the statistical dispersion of the crack growth rate is V z = 30%, as defined by that of the random variable Z in Eq.…”

Section: Demonstrative Examplementioning

confidence: 99%

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Fatigue reliability of gas turbine engine components under scheduledinspection maintenance

Yang

Chen

1985

Journal of Aircraft

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A probabilistic method is developed for the fatigue reliability analysis of gas turbine engine components under scheduled inspection maintenance in service. Various statistical uncertainties involved in the complex design system of gas turbine engine components have been taken into account, including the time to crack initiation, fatigue crack propagation, service loads, crack modeling, crack geometry, nondestructive evaluation (NDE), etc. It is demonstrated that the service inspection maintenance can be used to improve the reliability of fatiguecritical components significantly. Such an improvement in fatigue reliability is shown to depend on the capability of the NDE system employed. An example for the third-stage turbine disk of a TF-33 jet engine has been worked out to demonstrate the application of the analysis methodology developed.

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Section: = H 1 H 2 H 3 H 4 S Vmentioning

confidence: 99%

Section: Demonstrative Examplementioning

confidence: 99%

Fatigue reliability of gas turbine engine components under scheduledinspection maintenance

Yang

Chen

1985

Journal of Aircraft

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A Damage Tolerance Approach for Management of Aging Gas Turbine Engines

Cowie

1991

Springer Series in Computational Mechanics

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Entropy‐based method considering nonlinear hardening effect to predict the crack propagation life of superalloy GH4169 at elevated temperature

Ding,

Zuo,

et al. 2024

Fatigue Fract Eng Mat Struct

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This paper aims to determine the relationship between thermodynamic entropy generation and fatigue crack propagation life of superalloy GH4169 at 300–650°C. The entire specimen was considered as the thermodynamic system. The plastic energy dissipation in the crack tip was obtained by finite element simulation utilizing the Chaboche nonlinear hardening model. Then the cyclic entropy generation rate (CEGR) and the accumulated entropy generation are calculated by combining simulation and experimental methods. Results show that the CEGR is a power function of the stress intensity factor range, and it is almost a constant at fatigue failure. The fatigue fracture entropy (FFE) increases as fatigue cycles at failure increase at constant temperature, but it first decreases and then increases when temperature increases from 300 to 650°C. A fatigue life prediction model based on the thermodynamic damage parameter is established and verified by comparison with experimental results and available data in the literature.

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Damage tolerant design and test considerations in the engine structural integrity program

Cited by 4 publications

References 0 publications

Fatigue reliability of gas turbine engine components under scheduledinspection maintenance

Fatigue reliability of gas turbine engine components under scheduledinspection maintenance

A Damage Tolerance Approach for Management of Aging Gas Turbine Engines

Entropy‐based method considering nonlinear hardening effect to predict the crack propagation life of superalloy GH4169 at elevated temperature

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