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Khazali, Mohammad Sami Al
Brno University of Technology
in Cooperation with on an Cooperation-Score of 37%
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article
COMPARISON OF FATIGUE CRACK PROPAGATION RATES IN HIGH STRENGTH STEEL S460, S690 & S960 UNDER STRESS RATIO R = 0.1
Abstract
his study investigates the fatigue crack propagation rates of three kinds of high-strength steels S460, S690, and S960 under a stress ratio R = 0.1 at room temperature. Employing a comparative approach, tests were conducted using measurement of Crack Mouth Open Displacement by clip gauge (MTS testing machine 100 kN) and measurement of increase of a fatigue crack propagation by Optical observation on polished surface (Resonant Electromagnetic Pulsator Amsler 20 HFP 5100). The chemical composition and baseline mechanical properties, including tensile strength and hardness, were first characterized to establish a foundational understanding of the materials' behavior. The fatigue testing focused on identifying differences in crack propagation behavior and propagation rates between the two methods across selected steel grades. Preliminary findings suggest that the testing methodologies significantly impact the measured fatigue properties. These results contribute to the enhancement of predictive models for material performance and selection in engineering applications. Keywords: Fatigue crack propagation rate, high-strength steel, optical observation, microstructure.