Fatigue Crack Growth Prediction under Spectrum Load in an Aluminium Alloy using Crack Driving Force K*eff Approach

Kamath, BS and Anilchandra, AR and Sivaranjani, T and Narayana, BK (2020) Fatigue Crack Growth Prediction under Spectrum Load in an Aluminium Alloy using Crack Driving Force K*eff Approach. International Journal of Vehicle Structures & Systems, 12 (3). pp. 358-362. ISSN 0975-3060

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Abstract

Fatigue Crack Growth (FCG) behaviour in a Single-Edge-Notched Tension (SENT) specimen of 2024-T3 aluminium alloy under a standard mini-FALSTAFF spectrum load sequence was experimentally determined. Further, the FCG behaviour was predicted using cycle-by-cycle method and compared with experimental results. Prediction procedure involved are rain-flow counting of fatigue load cycles, estimation of crack driving force for each of the counted cycle and prediction of crack extension per cycle from constant amplitude crack growth rate equation. In the present work, a new crack driving force (CDF) K*eff involving Kujawski’s crack driving force K* in conjunction with Elber’s crack closure concept was used to account for load interaction effects. FCG prediction was also made using conventional CDF ΔKeff (Elber’s) approach. A good correlation was observed between experimental and predicted FCG behaviour under spectrum loads by the proposed K*eff approach. Also, this prediction was observed to be better than that predicted by conventional ΔKeff approach.

Item Type:	Article
Uncontrolled Keywords:	Fatigue crack growth; Spectrum load; Crack closure; Mini-FALSTAFF; Fatigue crack growth test
Subjects:	CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Nonmetallic Materials ENGINEERING > Mechanical Engineering
Depositing User:	Mrs SK Pratibha
Date Deposited:	25 Aug 2022 16:09
Last Modified:	25 Aug 2022 16:09
URI:	http://nal-ir.nal.res.in/id/eprint/13640

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