PSI - Issue 37

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

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 37 (2022) 500–507

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Abstract For the dimensioning of components made of low and medium-strength steels, there are established estimation methods for the material properties as well as transfer functions to transmit these parameters to components. However, for ultra-high strength steels, this level of knowledge is still insufficient and has not yet been specified in guidelines. In the present work, tensile and fatigue tests are performed with different high-strength and ultra-high-strength steels, which provide the data basis for an extension of the estimation methods. This is intended to enable the estimation of the cyclic material behaviour of these kind of steels on the basis of a limited amount of experimental input data and then to use these material parameters as input for the proof of structural durability based on the local strain approach for components made of ultra-high strength steels. © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) 1. Introduction In modern mechanical engineering, especially in the automotive industry, ultra-high strength steels are being used in an increasing number of applications, which is due to certain advantages of these materials. For example, steels with very high strength and resistance to wear are used for screws and bolts, chassis and body parts as well as bearings and transmission parts. In this way, not only the durability can be extended, but also the production can be more resource-efficient and sustainable as well as fuel consumption and thus emissions can be reduced through lightweight construction. For low and medium strength steels, there are established estimation methods for the cyclic material Abstract For the dimensioning of components made of low and medium-strength steels, there are established estimation methods for the material properties as well as tra sfer functions t transmit these parame er o components. However, for ultr -high strength steels, this level of knowledge is still insu ficie t and has not yet be n s ecified in guidelines. I the present w k, ensile and fatigue t sts are p rformed ith different high-strength and ultra-high-strength steels, which provide the data basis for an extension of the estimati n methods. This is intended to enable the estimation of the cyc ic material behaviour of hese kind of st els on the basis of a lim ted amount of experimental input d ta and then to use these material parameters as inp t f r proof of structural dura ility based on the local strain approach for compone ts made of ultra-high st ength ste ls. © 2022 T Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der responsibility of Pedro Miguel Guimara s Pires Morei a K ywords: Ultra-high strength steels; Fatigue stren th; Local strain approach 1. Introduction In modern mechanical engineering, especially in the automotive industry, ultra-high strength steels are being used in a incr asing number of applications, wh ch is due to certain advantages of these mat rials. For example, steels with very high strength and resistance to wear are used for sc ews nd bolts, chassis and body parts as well as bearing and transm ssion par s. I thi way, n t only the durability can be extended, but lso the roduction can more resou ce-effic e t and ustainable s well as fuel consumption d thus emissions can be reduce through lightweight const uction. For low and medium str ngth st els, there are established e timation m tho s for the cyc c material ICSI 2021 The 4th International Conference on Structural Integrity Estimation of the fatigue strength of ultra-high strength steels Patrick Yadegari a, *, H. Thomas Beier a , Michael Vormwald a , Andreas Kleemann b a Technical University of Darmstadt, Materials Mechanics Group, Franziska-Braun-Str. 3, 64287 Darmstadt, Germany b Institute of Materials Research and Testing at the Bauhaus-University, Coudraystr. 9, 99423 Weimar, Germany ICSI 2021 The 4th International Conference on Structural Integrity Estimation of the fatigue strength of ultra-high strength steels Patrick Yadegari a, *, H. Thomas Beier a , Michael Vormwald a , Andreas Kleemann b a Technical University of Darmstadt, Materials Mechanics Group, Franziska-Braun-Str. 3, 64287 Darmstadt, Germany b Institute of Materials Research and Testing at t e Bauhaus-University, Coudraystr. 9, 99423 Wei ar, Germany Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira Keywords: Ultra-high strength steels; Fatigue strength; Local strain approach

* Corresponding author. Tel.: +49-6151-16-23089; fax: +49-6151-16-23083. E-mail address: yadegari@wm.tu-darmstadt.de * Corresponding author. Tel.: +49-6151-16-23089; fax: +49-6151-16-23083. E-mail address: yadegari@wm.tu-darmstadt.de

2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 2452-3216 © 2022 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review u der responsibility of Pedro Miguel Guimara s Pires Moreira

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.115