Damage Tolerance Behavior of a Nickel-Based Super-alloy GTM718 Under Cold-TURBISTAN Variable Amplitude Loads

Malipatil, SG and Majila, AN and Fernando, CD and Manjuprasad, M and Manjunatha, CM (2021) Damage Tolerance Behavior of a Nickel-Based Super-alloy GTM718 Under Cold-TURBISTAN Variable Amplitude Loads. Transactions of the Indian Institute of Metals, 74 (4). pp. 901-907.

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Abstract

In this study, the damage tolerance behavior in terms of fatigue crack propagation behavior of an aero-engine material under a standard variable amplitude load sequence was predicted and compared with experimental results. The constant amplitude (CA) fatigue crack growth rate (FCGR) behavior of GTM718, a nickel-based super-alloy, was determined at various stress ratios R = σmin/σmax ranging from R = 0.1 to 0.7. The empirical fatigue crack growth law was derived from this data in terms of two-parameter crack driving force, ΔK*. Then, the fatigue crack propagation behavior of GTM718 under a standard cold-TURBISTAN variable amplitude load sequence was predicted using cycle-by-cycle approach and using the CA fatigue crack growth law. Also, experimental fatigue crack growth behavior under the same cold-TURBISTAN variable amplitude load sequence was determined and compared with predicted results. A fairly good correlation was observed with predicted and experimental results.

Item Type:	Article
Uncontrolled Keywords:	Damage tolerance, Fatigue crack growth, Cold-TURBISTAN, Variable amplitude load � GTM718
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Metals and Metallic Materials
Depositing User:	Mrs SK Pratibha
Date Deposited:	25 Aug 2022 16:50
Last Modified:	25 Aug 2022 16:50
URI:	http://nal-ir.nal.res.in/id/eprint/13643

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