Different R-Curves for Two- and Three-Dimensional Cracks

R-curves caused by crack face interactions are important for the strength assessment of components with small cracks. Whereas an influence of the initial crack length on the R-curve is well understood on the basis of fracture mechanics, it will be shown here that also the type of the crack affects t...

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Veröffentlicht in:	International journal of fracture 2008-10, Vol.153 (2), p.153-159
Hauptverfasser:	Fett, Theo, Fünfschilling, Stefan, Hoffmann, Michael J., Oberacker, Rainer
Format:	Artikel
Sprache:	eng
Schlagworte:	Automotive Engineering Characterization and Evaluation of Materials Chemistry and Materials Science Civil Engineering Classical Mechanics Crack bridging Crack propagation Cracks Edge cracks Exact sciences and technology Fracture mechanics Fracture mechanics (crack, fatigue, damage...) Fundamental areas of phenomenology (including applications) Letters in Fracture and Micromechanics Materials Science Mechanical Engineering Physics Solid mechanics Structural and continuum mechanics Surface cracks
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Beschreibung
Zusammenfassung:	R-curves caused by crack face interactions are important for the strength assessment of components with small cracks. Whereas an influence of the initial crack length on the R-curve is well understood on the basis of fracture mechanics, it will be shown here that also the type of the crack affects the crack growth resistance. For a given crack-bridging relation it can be shown that 3-dimensional cracks as circular internal cracks and semi-circular surface cracks must exhibit a lower R-curve than obtainable from 2-dimensional edge cracks.
ISSN:	0376-9429 1573-2673
DOI:	10.1007/s10704-008-9289-0