PSI - Issue 17

Jan Klusák et al. / Procedia Structural Integrity 17 (2019) 576–581 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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of rolling of the plate. The following conclusions can be stated: (i) The steel grade S355 J2 exhibit higher fatigue limit than the steel S355 J0. (ii) The samples of the steel grade S355 J2 led to higher number of cycles to fracture (at the same loading level) than the steel S355 J0. (iii) The orientation of the sample axis relative to the rolling direction has almost no effect on fatigue life. (iv) Both surface and interior crack initiation was observed. (v) Purity of the material examined has significant impact on fatigue life of S355 steels.

Fig. 6: Subsurface crack initiation and the inclusion near the point of the crack initiation in S355 J2B (specimen no. 7 – N f = 8.57  10 7 )

Acknowledgements

The Czech Science Foundation under the contract No. 17-01589S supported this research. The research was conducted in the frame of the project CEITEC 2020 [LQ1601] of MEYS.

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