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The Crack Growth Life Predictions for High Cycle Dynamic Components

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Abstract:

Using of a safe life approach is necessitated by the small critical crack sizes and rapid crack growth rates resulting from the severe vibratory environment of rotorcraft. However Based on the success of damage tolerance initiative for airframe structure, a crack growth based on damage tolerance approach is being examined for implementation into the design and management of dynamic components. In this paper the crack growth behavior in low cycle fatigue (LCF) and high cycle fatigue (HCF) are compared and the accuracy of several damage tolerance analysis methods in determining the crack growth life from an initial detectable crack size 1.25 mm to 12 mm for a rotorcraft main rotor yoke are investigated. The real rotorcraft materials measured by experiment and the fatigue load mean frequency spectrum based on statistical usage spectrum are adopted. The crack growth equations used in the programs are discussed to provide a basis for understanding the results. The results show that the load less than the safe fatigue limit has an important effect on crack growth life and it is reasonable for the material that the cut-off stress ratio for the threshold stress intensity factor range is set 0.7.

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Periodical:

Key Engineering Materials (Volumes 324-325)

Pages:

963-966

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.324-325.963

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Online since:

November 2006

Authors:

Zhi Tao Mu, Wen Lin Liu, Ping Jin

Keywords:

Crack Growth Life, Damage Tolerance, Dynamic Components, High Cycle Fatigue (HCF), Rotorcraft

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

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