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

被引:0
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作者
Theo Fett
Stefan Fünfschilling
Michael J. Hoffmann
Rainer Oberacker
机构
[1] Universität Karlsruhe,
[2] Institut für Keramik im Maschinenbau,undefined
来源
关键词
Bridging stresses; circular crack; edge crack; R-curve;
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摘要
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.
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页码:153 / 159
页数:6
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