Modelling of the test frequency discrepancy in USF testing of structural steels

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Milne, Lewis Andrew and Gorash, Yevgen and Comlekci, Tugrul and MacKenzie, Donald and Walker, Carl (2025) Modelling of the test frequency discrepancy in USF testing of structural steels. Procedia Structural Integrity, 75. pp. 419-425. ISSN 2452-3216 (https://doi.org/10.1016/j.prostr.2025.11.041)

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Abstract

This research addresses the discrepancy in fatigue resistance between the test data for conventional test frequency and accelerated frequency for common structural steels. As the most commonly attributed factor for the difference is the increase in strain rate at elevated test frequencies, high strain rate tensile tests were carried out to evaluate the influence of strain rate on material strength. The tested steels exhibited an increase in yield strength of 28-48% at strain rates corresponding to 20kHz. Normalising the SN curves by the dynamic yield strength was not sufficient to account for the discrepancy in fatigue resistance, however, pointing to the existence of some other factor influencing the frequency sensitivity.

ORCID iDs

Milne, Lewis Andrew ORCID logoORCID: https://orcid.org/0000-0001-6551-1264, Gorash, Yevgen ORCID logoORCID: https://orcid.org/0000-0003-2802-7814, Comlekci, Tugrul ORCID logoORCID: https://orcid.org/0000-0002-7892-7960, MacKenzie, Donald ORCID logoORCID: https://orcid.org/0000-0002-1824-1684 and Walker, Carl;
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