A Study on the Variation of the Mechanical Properties and Mode of the Hot-Rolled Mild Stell plate under Fatigue Loading

피로 하중을 받는 열간 압연 연강판재의 기계적 성질과 모우드 변화에 관한 연구

Using natural frequency measurement method, which is one of NDT method, natural frequency of the hot-rolled mild steel plate(specimen) under fatigue loading was measured. Between the degradation of the specimen under fatigue loading and the variation of the natural frequency of the specimen was investigated. As a result, the degradation of the specimen was described and monitored as variation of natural frequency of specimen. The natural frequency of specimen decreased gradually under fatigue loading. This means the variation of material properties of specimen. Especially. It means the variation of Young's modulus of specimen.