On a kinked crack model to describe the influence of material microstructure on fatigue crack growth

Andrea Spagnoli, Andrea Carpinteri, Sabrina Vantadori

Abstract


Threshold condition and rate of fatigue crack growth in both short and long crack regime appear to
be significantly affected by the degree of crack deflection. In the present paper, a theoretical model of a
periodically-kinked crack is presented to describe the influence of the degree of crack deflection on the fatigue
behavior. The kinking of the crack is due to a periodic self-balanced microstress field having a length scale, d.
By correlating the parameter d with a characteristic material length (e.g. average grain size in metals, maximum
aggregate dimension in concrete), the possibility of using the present model to describe some experimental
findings related to crack size effects in fatigue of materials is explored. Well-known experimental results
concerning two different situations (fatigue threshold and fatigue crack growth in the Paris regime) are briefly
analysed.


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DOI: http://dx.doi.org/10.3221%2FIGF-ESIS.25.14