An experimental and numerical study of crack closure

• Published in: Engineering fracture mechanics Vol. 22; no. 6; pp. 997 - 1011
• Main Authors: Blom, Anders F., Holm, Dan K.
• Format: Journal Article
• Language: English
• Published: Tarrytown, NY Elsevier Ltd 1985; Oxford Elsevier
• Subjects: 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; Finite element method; Stress intensity factor; Calculation; Plastic deformation; Fracture appearance; Elastic deformation; Finite element methode; Fatigue crack; Crack propagation
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/0013-7944(85)90039-6

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.