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맞대기 용접 압연 강판재의 피로균열 진전 거동 Behavior of Fatigue crack Propagation in Butt-welded Rolling Steel Plate

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맞대기 용접 압연 강판재의 피로균열 진전 거동
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    초록·키워드

    For the improvement of safety and endurance in welded steel structure, it is needed to consider welding residual stress distribution and rolling directional characteristics of materials. In this study, it was investigated experimentally about characteristics of fatigue crack propagation according to welding residual stress and rolling in FCAW(flux cored arc welding) butt-jointed steel plates. SS400 steel plates of 3㎜ thickness were selected and tested for this study. When the angles between tensile loading direction and rolling direction in welded materials are increased from 0° to 90°, their fatigue crack propagation rates are increased. These results are same as predicted increments of fatigue crack propagation rate when stress ratio is increased from 0 to 0.5. When the angles of rolling direction and welding direction to tensile loading direction are 0° and 90° respectively, fatigue crack propagation rate in welded material is lowest. In these results, it is shown that welded steel plate structures are needed to harmonize distributed welding residual stress, rolling direction and loading direction for the improvement of safetyand endurance in manufacture of their structures.

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      UCI(KEPA) : I410-ECN-0101-2009-552-016173871