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An Energy Based Fatigue Life Prediction Framework for In-Service Structural Components

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Abstract

An energy based fatigue life prediction framework has been developed for calculation of remaining fatigue life of in service gas turbine materials. The purpose of the life prediction framework is to account aging effect caused by cyclic loadings on fatigue strength of gas turbine engines structural components which are usually designed for very long life. Previous studies indicate the total strain energy dissipated during a monotonic fracture process and a cyclic process is a material property that can be determined by measuring the area underneath the monotonic true stress-strain curve and the sum of the area within each hysteresis loop in the cyclic process, respectively. The energy-based fatigue life prediction framework consists of the following entities: (1) development of a testing procedure to achieve plastic energy dissipation per life cycle and (2) incorporation of an energy-based fatigue life calculation scheme to determine the remaining fatigue life of in-service gas turbine materials. The accuracy of the remaining fatigue life prediction method was verified by comparison between model approximation and experimental results of Aluminum 6061-T6. The comparison shows promising agreement, thus validating the capability of the framework to produce accurate fatigue life prediction.

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Abbreviations

β0 :

Material parameter

β1 :

Material parameter

C:

Scalar factor

ε:

True strain for monotonic case

ε0 :

Material parameter

εa :

True cyclic strain

εf :

True strain at the fracture

εn :

True strain at the necking

E:

Modulus of elasticity

N:

Number of cycle to failure

σ:

True stress

σ0 :

Material parameter

σa :

Alternating stress amplitude

σc :

Material parameter

σn :

True stress at the necking

Wc :

Strain energy dissipated per cycle

Wm :

Strain energy for monotonic case

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Acknowledgments

The authors would like to thank the Air Force Research Laboratories (AFRL), specifically the Turbine Engine Fatigue Facility (TEFF) laboratory for their financial support, facility and equipment access, and encouragement for this research. The authors also would like to express their appreciation to Dr. Bulent H. Sencer of Idaho National Laboratory (INL) for helpful discussions.

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Correspondence to M.-H. H. Shen.

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Ozaltun, H., Shen, MH.H., George, T. et al. An Energy Based Fatigue Life Prediction Framework for In-Service Structural Components. Exp Mech 51, 707–718 (2011). https://doi.org/10.1007/s11340-010-9365-z

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