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A numerical study of non-linear crack tip parameters
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Authors
Advisor(s)
Abstract(s)
Crack closure concept has been widely used to explain different issues of fatigue crack propagation. However, different authors
have questioned the relevance of crack closure and have proposed alternative concepts. The main objective here is to check
the effectiveness of crack closure concept by linking the contact of crack flanks with non-linear crack tip parameters.
Accordingly, 3D-FE numerical models with and without contact were developed for a wide range of loading scenarios and the
crack tip parameters usually linked to fatigue crack growth, namely range of cyclic plastic strain, crack tip opening
displacement, size of reversed plastic zone and total plastic dissipation per cycle, were investigated. It was demonstrated that:
i) LEFM concepts are applicable to the problem under study; ii) the crack closure phenomenon has a great influence on crack
tip parameters decreasing their values; iii) the ΔKeff concept is able to explain the variations of crack tip parameters produced
by the contact of crack flanks; iv) the analysis of remote compliance is the best numerical parameter to quantify the crack
opening level; v) without contact there is no effect of stress ratio on crack tip parameters. Therefore it is proved that the crack
closure concept is valid.
Description
Keywords
Fatigue crack propagation Plasticity induced crack closure Non-linear crack tip parameters ΔKeff
Pedagogical Context
Citation
ANTUNES, F. V. [et all.] (2015) - A numerical study of non-linea crack tip parameters. Frattura ed Integrità Strutturale. ISSN 1971-8993. Nº 33, p. 199-20. Doi: 10.3221/IGF-ESIS.33.25
Publisher
Gruppo Italiano Frattura