An experimental and numerical study of crack closure

Fatigue crack propagation and crack closure are studied in Al 2024-T3 under a wide range of ΔK. An elastic-plastic finite element procedure to analyze crack closure for growing cracks is presented. Numerical results are obtained for plane stress and plane strain conditions for different stress ratio...

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Veröffentlicht in:	Engineering fracture mechanics 1985, Vol.22 (6), p.997-1011
Hauptverfasser:	Blom, Anders F., Holm, Dan K.
Format:	Artikel
Sprache:	eng
Schlagworte:	aluminum Applied sciences Condensed matter: structure, mechanical and thermal properties crack propagation Cross-disciplinary physics: materials science rheology elastoplasticity Exact sciences and technology Fatigue Fatigue, brittleness, fracture, and cracks finite element method Materials science Mechanical and acoustical properties of condensed matter Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology Mechanical properties of solids Metals, semimetals and alloys Metals. Metallurgy Physics Specific materials
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Beschreibung
Zusammenfassung:	Fatigue crack propagation and crack closure are studied in Al 2024-T3 under a wide range of ΔK. An elastic-plastic finite element procedure to analyze crack closure for growing cracks is presented. Numerical results are obtained for plane stress and plane strain conditions for different stress ratios. Measurements of opening loads compare well with numerical predictions within the Paris regime. Fractographic observations and compliance measurements indicate that oxide-induced and roughness-induced crack closure substantially increase the opening loads in the near-threshold regime.
ISSN:	0013-7944 1873-7315
DOI:	10.1016/0013-7944(85)90039-6