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루나빅터마빈 ( Luna Victor Marvin ),김인태 ( Kim In-tae ) 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.26 No.2
Corrosion can compromise the fatigue strength of steel structures. A sudden change in cross-sectional area due to corrosion damage can cause a sharp increase in stress concentration which can lead to fatigue cracks under cyclic loading. Therefore, predicting the location of high stress concentration is key to fatigue assessment. In this study, signal processing techniques (SPTs) were employed in evaluating stress concentration factor (SCF) of irregular surfaces. Fourier Transform, one of the techniques, decomposes a complex wave into sinusoidal waves, thus simplifying SCF computations. In comparison with using Finite Element Method, applying SPTs yielded generally below a 5% error in estimating the SCF fluctuations of corroded plates.