Influence of Micro-Structure on the Fatigue Crack Propagation in Bridge Steel

Abstract

Abstract:The use of high strength steels (HSS) allows designing lighter, slenderer and simpler structures with high structural performance. In general, the use of HSS leads to weight reduction of the whole structure, which compensates the higher cost of such a material comparing to the conventional construction steels. Knowledge of the fatigue resistance of material plays the key role during design and maintenance of the bridge structures. This contribution brings a comparison of the fatigue crack growth resistance of S355 J0 steel. Differences in microstructure and the texture of material structure could generally play a role in the fatigue crack growth. This study shows that in the case of studied steel texture of material structure has an influence on material fatigue behavior in Paris' law regime.

Comparison of fatigue crack propagation behaviour in two steel grades S235, S355 and a steel from old crane way

“…It is expected that rolling direction corresponds to purposed direction of loading (fatigue cracks initiate and grow perpendicularly to the loading direction), see [9]. Note that previous work on S355 [10,11,12] S355 J2 [13] or S355 J0 [14,15] showed that the fatigue crack propagation rate seems to be independent of the rolling direction and resulting microstructure. Fig.…”

Geometry Functions for Edge Cracks in Steel Bridge under Three- and Four- Point Bending with Various Span

“…Fatigue progression of the cracks from the edge and from the surface is used as a basis for proposing a system of inspections of details, which tend to be damaged by fatigue [2], [3], [4], sensitivity analysis [5] [6], probabilistic analysis of the S-N field [7], [8] and crack propagation rate [9] etc. The input data are usually material properties [10], [11], [12], [13], [14] and information about boundary conditions-calibration curves [15].…”