Growth of artificially and naturally initiating notch root cracks under FALSTAFF spectrum loading

Sunder, R and Prakash, RV and Mitchenko, EI (1994) Growth of artificially and naturally initiating notch root cracks under FALSTAFF spectrum loading. In: AGARD, An Assessment of Fatigue Damage and Crack Growth Prediction Techniques, 1994.

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Abstract

The paper describes an experimental study of notch root fatigue crack growth under FALSTAFF spectrum loading in an Al-Cu alloy. Crack growth rates were measured from crack size as small as 20 microns using optical fractography and replication technique. Fractographic measurements indicate similar scatter levels between notch root short crack and long growth rate data. This is in contrast to surface replica based measurements which are indicative of large scatter. Growth rate variation was noticed between multiple cracks initiating after different periods of natural crack formation. This is attributed to the influence of larger existing cracks on smaller cracks that appear later. In contrast identical artificially initiating cracks grew at a similar rate

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Aluminum alloys;Copper alloys;Crackinitiation;Crack propagation;Cracking(Fracturing);Fatigue(Materials);Notches13;
Subjects: ENGINEERING > Structural Mechanics
Division/Department: Structures Division, Structures Division, Structures Division
Depositing User: Mrs Manoranjitha M D
Date Deposited: 13 Oct 2006
Last Modified: 24 May 2010 09:51
URI: http://nal-ir.nal.res.in/id/eprint/3023

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