PSI - Issue 68

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2025) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 68 (2025) 1159–1165

European Conference on Fracture 2024 Temperature-corrected electrical resistance in fatigue life prediction methods for higher testing frequencies J.A. Ziman a *, M. Maul a , F. Weber a,b , L.M. Sauer c , J.L. Otto c , F. Walther c , P. Starke a,b a University of Applied Sciences Kaiserslautern, Department of Materials Science and Materials Testing, Institute QM 3 , D-67659 Kaiserslautern, Germany

b Saarland University, Faculty of Natural Sciences and Technology, D-66123 Saarbrücken, Germany c TU Dortmund University, Chair of Materials Test Engineering (WPT), D-44227 Dortmund, Germany

– Dedicated on the occasion of the 75 th birthday of Prof. Dr.-Ing. habil. Dietmar Eifler –

Abstract For the adequate characterisation of the fatigue behaviour regarding higher testing frequencies, an accurate differentiation between frequency- and temperature-related influences on the fatigue life is of great importance. To enable such a distinction, the temperature dependence of the electrical resistance was quantified using electrical resistance-temperature hysteresis measurements. The obtained parameter served as input for the evaluations regarding the fatigue behaviour. Based on these insights, a temperature dependent electrical resistance value can be obtained, which enables the determination of a temperature-corrected electrical resistance. Since this value is characterized by a high sensitivity regarding microstructural changes, it is well suited to be integrated into the lifetime prediction method StressLife. As a result, the applicability of the accelerated lifetime prediction for increased testing frequencies could be shown for the first time. A further major objective of this work was to quantify the frequency effect on fatigue properties of the investigated ferritic-pearlitic steel SAE 1045 (C45E, 1.1191). The estimated temperature-corrected electrical resistance was used as a microstructure-dependent parameter for the assessment of fatigue behaviour. In addition, the residual stress state was quantified by X-ray diffraction investigations and correlated with the results of cyclic deformation curves. © 2025 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 ECF24 organizers Keywords: Electrical resistance; higher testing frequencies; High Cycle Fatigue; resonant testing rig; residual stress; © 2025 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 ECF24 organizers

* Corresponding author. E-mail address: jonas.ziman@hs-kl.de

2452-3216 © 2025 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 ECF24 organizers

2452-3216 © 2025 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 ECF24 organizers 10.1016/j.prostr.2025.06.182