The influence of the hollow and solid shaft cross sectionof SM 30 C steel on corrosion fatigue strength

J. Ocean Eng. Technol. 1997;11(2):28-38.

SM 30 C강의 중공 중실축 단면변화 부식피로강도에 미치는 영향

신규동,장백선,김웅집

부산전문대학 기계설계과,부산전문대학 기계설계과,동아공고 기계과

Keywords: Corrosion Period, Corrosion Condition, Surface Roughness, Corrosion Fatigue Strength, Initial Fatigue Crack, Interference Phenomenon of the Crack

핵심용어: 부식기간, 부식조건, 표면요철, 부식피로강도, 초기피로크랙, 크랙의 간섭현상

Abstract

The corrosion fatigue test was conducted in air to investigate the corrosion fatigue strength of SM 30 C steel by which was corroded in the under sea and surface in the conditions of 3.0% NaCl salt solution. The fatigue tests were carried out on a rotary bending testing machine of cantilever type. The corrosion effect of the sea surface conditionwas served more than that of the under sea condition which was due ti the periodic contact of air thus accelerate the corrosion. The difference of the fatgue strength between sea surface and under sea conditions decreased with increase of stree level and corroded period. Inthe case of the solid shaft and thickness 2mm of hollow shaft, the difference of corrosion fatigue strength decreased as stress level and corrosion periodic increasing. Onthe contrary in the case of thickness 1mm of hollow sgaft, the difference of it increased as stress level, corrosionn periooodic increasing and also the condition of corrosion chaanged. The main factors affecting the degradation of fatigue strength due to corrosion were the reduction of sectional area and the increase of surface roughness. The interference phenomenon increase with stress level got higher.