PSI - Issue 19

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ScienceDirect

Procedia Structural Integrity 19 (2019) 302–311 Structural Integrity Procedia 00 (2019) 000–000 Structural Integrity Procedia 00 (2019) 000–000

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Fatigue Design 2019 Fatigue response of high-strength steel bolted connections under in-plane shear and out-of-plane bending loading modes Fatigue Design 2019 Fatigue response of high-strength steel bolted connections under in-plane shear and out-of-plane bending loading modes

Okan Yılmaz a, ∗ , Carlos Jime´nez-Pen˜a b , Dimitri Debruyne b a ArcelorMittal Global R & D Gent - OCAS N.V., Pres. J.F. Kennedylaan 3, 9060 Zelzate, Belgium b KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001 Leuven, Belgium Okan Yılmaz a, ∗ , Carlos Jime´nez-Pen˜a b , Dimitri Debruyne b a ArcelorMittal Global R & D Gent - OCAS N.V., Pres. J.F. Kennedylaan 3, 9060 Zelzate, Belgium b KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001 Leuven, Belgium

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. Abstract The use of high-strength steel (HSS) permits weight reduction in heavy-duty applications such as trucks, trailers, and agricultural machinery, where significant fatigue resistance is a requirement. Fatigue cracks are often initiated at locations of stress concentra tion such as the joining of mechanical parts, the most widely used methods being welding and mechanical fastening. It is known that HSSs do not only have higher yield values but also perform better in terms of fatigue. Yet, the weld fatigue resistance does not improve with an increase in the base material property due to the stress concentrations and imperfections introduced by welding. The aim is to explore the possibilities of using conventional mechanical joining techniques for HSSs and assess the fatigue prop erties under typical loading modes. Mechanical joining introduces an additional failure mechanism called fretting fatigue resulting from the oscillatory relative displacement between the surfaces in contact. This failure mode is reproduced by the experiments and the e ff ects of pre-tension, hole-making procedure, washer configuration, and surface condition are analyzed for steel grades S500MC, S700MC, and S960MC. Accompanying finite-element simulations are employed to develop a deeper understanding of the underlying physics. The results might lead to various guidelines with respect to design rules and best practices for HSS bolted connections subjected to fatigue loading. c 2019 The Authors. Published by Elsevier B.V. r-review unde responsibility of the Fatigue Design 2019 Organizers. Keywords: high-strength steels; bolted connections; fretting fatigue Abstract The use of high-strength steel (HSS) permits weight reduction in heavy-duty applications such as trucks, trailers, and agricultural machinery, where significant fatigue resistance is a requirement. Fatigue cracks are often initiated at locations of stress concentra tion such as the joining of mechanical parts, the most widely used methods being welding and mechanical fastening. It is known that HSSs do not only have higher yield values but also perform better in terms of fatigue. Yet, the weld fatigue resistance does not improve with an increase in the base material property due to the stress concentrations and imperfections introduced by welding. The aim is to explore the possibilities of using conventional mechanical joining techniques for HSSs and assess the fatigue prop erties under typical loading modes. Mechanical joining introduces an additional failure mechanism called fretting fatigue resulting from the oscillatory relative displacement between the surfaces in contact. This failure mode is reproduced by the experiments and the e ff ects of pre-tension, hole-making procedure, washer configuration, and surface condition are analyzed for steel grades S500MC, S700MC, and S960MC. Accompanying finite-element simulations are employed to develop a deeper understanding of the underlying physics. The results might lead to various guidelines with respect to design rules and best practices for HSS bolted connections subjected to fatigue loading. c 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. Keywords: high-strength steels; bolted connections; fretting fatigue Compared to mild steel grades, high-strength steels (HSS) have better mechanical properties and fatigue lifetime improvement, which make weight reduction possible especially in heavy-duty applications such as trucks, trailers, and agricultural machinery, leading to lower fuel consumption. Since significant fatigue resistance is an important design requirement, it is crucial to make use of the better fatigue properties of HSSs. Fatigue cracks initiate at locations of stress concentration such as the joining of mechanical parts, which are either welded or fastened. However, with welds it is not possible to increase the fatigue life without the application of special post-treatment techniques [1] as ∗ Corresponding author. Tel.: + 32-47-703-0917. E-mail addresses: okan.yilmaz@arcelormittal.com (Okan Yılmaz)., carlos.jimenezpena@kuleuven.be (Carlos Jime´nez-Pen˜a)., dim itri.debruyne@kuleuven.be (Dimitri Debruyne). 2210-7843 c 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. Compared to mild steel grades, high-strength steels (HSS) have better mechanical properties and fatigue lifetime improvement, which make weight reduction possible especially in heavy-duty applications such as trucks, trailers, and agricultural machinery, leading to lower fuel consumption. Since significant fatigue resistance is an important design requirement, it is crucial to make use of the better fatigue properties of HSSs. Fatigue cracks initiate at locations of stress concentration such as the joining of mechanical parts, which are either welded or fastened. However, with welds it is not possible to increase the fatigue life without the application of special post-treatment techniques [1] as ∗ Corresponding author. Tel.: + 32-47-703-0917. E-mail addresses: okan.yilmaz@arcelormittal.com (Okan Yılmaz)., carlos.jimenezpena@kuleuven.be (Carlos Jime´nez-Pen˜a)., dim itri.debruyne@kuleuven.be (Dimitri Debruyne). 2210-7843 c 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 1. Introduction 1. Introduction

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the Fatigue Design 2019 Organizers. 10.1016/j.prostr.2019.12.033