PSI - Issue 17

Available online at www.sciencedirect.com Structural I tegrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 17 (2019) 576–581

ICSI 2019 The 3rd International Conference on Structural Integrity Very high cycle fatigue tests of high strength steels S355 J0 and S355 J2 Jan Klusák a, *, Stanislav Seitl a a CEITEC IPM – Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 62 Brno, Czech Republic ICSI 2019 The 3rd International Conference on Structural Integrity Very high cycle fatigue tests of high strength steels S355 J0 and S355 J2 Jan Klusák a, *, Stanislav Seitl a a CEITEC IPM – Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 616 62 Brno, Czech Republic

Abstract Abstract

The high strength steel S355 is frequently used in civil engineering to design bridges, its elements or simple engineering parts. The properties of the steel lead to savings both material’s and economical meeting strict construction requirements. From this reason, fatigue resistance of the material is in focus of researchers. Results obtained from experimental observations provide reliable inputs to lifetime assessments and numerical simulations of fatigue loaded structures like bridges, cranes and other constructions. As these constructions are designed for a long life, we have studied the properties of the material in the field of high-cycle and very high-cycle fatigue. Tests of two standard S355 J0 and S355 J2 steel grades were performed on ultrasonic fatigue testing system. Both steels exhibited fatigue behavior in gigacycle region while S355 J2 exhibited higher number of cycles to failure. Fracture surfaces were studied and showed both surface and subsurface crack initiation. high strength st el S355 is frequently used in civil engi eering to design brid es, its elements or simple engineering parts. The properties of the steel lead to savings both material’s and economical meeting strict construction requirements. From this r ason, fatigue resistance of the aterial is in focus of rese rchers. Results obtained from experimental observations provide reliable inputs to lifetime assessments and numerical simulations of fatigue loa ed structures like bridges, cranes and other constru tions. As these constructions are designed f r a long life, we have studied the properties of the material in the field of high-cycle and very high-cycle fatigue. Tests of two standard S355 J0 and S355 J2 steel grades w re performed on ultrasonic fatigue testing system. Both steels exhibited fatigue behavior in gigacycle region while S355 J2 exhibited higher number of cycles to failure. Fracture surfaces were studied and showed both surface and subsurface crack initiation.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. Keywords: Very high cycle fatigue, high strength steel, fatigue life, structural steel Keywords: Very high cycle fatigue, high strength steel, fatigue life, structural steel

1. Introduction 1. Introduction

Modern structures require high performance materials. The use of high strength steels (HSS) lead to weight reduction of structures, where the higher cost of the material is compensated by the safe of material. The application of HSS increases in the last years, Miki et al. (2002). Modern structures require high performance materials. The use of high strength steels (HSS) lead to weight reduction of structures, where the higher cost of the material is compensated by the safe of material. The application of HSS increases in the last years, Miki et al. (2002).

* Corresponding author. Tel.: +420532290348. E-mail address: klusak@ipm.cz * Correspon ing author. Tel.: +420532290348. E-mail address: klusak@ipm.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.077