공간통계에 기반한 부식표면 불규칙성에 따른 응력집중계수 변화 분석

초록

In this study, Finite element analyses were conducted to investigate variations in the stress concentration factor caused by uncertainty and irregularity in corrosion surfaces. Corrosion surfaces were generated using the mean corrosion depth, standard deviation, and spatial correlation parameters, namely the sill and range. The irregularity of corrosion surfaces was modeled by varying the probability distributions, mean corrosion depths, and standard deviations. The irregularity of corrosion surface geometry was considered by generating multiple corrosion surfaces under identical conditions, and the corresponding stress concentration factors were analyzed. The analysis results showed that the maximum stress did not necessarily occur at the location of the maximum corrosion depth. For the same mean corrosion depth and standard deviation, the location of maximum stress and the stress concentration factor varied depending on the probability distribution and surface geometry. It was found that the stress concentration factor was predominantly governed by the maximum corrosion depth induced by surface irregularity.

키워드