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 fatiguebehavior. 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.
Highlights
Cracks in both brittle and ductile materials tend to deflect because of far-field multiaxial stresses, microstructural inhomogeneities (grain boundaries, interfaces, etc.), residual stresses, etc
Under fatigue loading, cracks in both brittle and ductile materials tend to deflect because of far-field multiaxial stresses, microstructural inhomogeneities, residual stresses, etc
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
Summary
Cracks in both brittle and ductile materials tend to deflect because of far-field multiaxial stresses, microstructural inhomogeneities (grain boundaries, interfaces, etc.), residual stresses, etc.
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