피로파면의 기하학적 형상을 바탕으로 한 응력진폭 변화와 혼합모드 하중관계에 관한 연구 = A Study on Mixed-mode Loading as Stress Amplitude Based on Geometrical Shape in Fatigue Fracture Surface

다국어 초록 (Multilingual Abstract)

Most cracks in the structure occur under mixed mode loading and those fatigue crack propagation behavior depends on the stress ratio. Hence. it is necessary to study the fatigue behavior under mixed-mode loading as the stress ratio changes. In this paper, the fatigue crack behavior was respectively investigated at stress ratio 0.33, 0.50 and we changed the loading application angle into 0°, 30°, 45°, 60° to apply various loading mode. These experimental results were evaluated by the shape of fatigue fracture surface using 2D or 3D images obtained from the C-scan method. As stress ratio and mode mixity change, the change of effective stress intensity factor and crack closure have effect on the fatigue behavior of cracks. The variation of fatigue crack behavior caused by the change of stress ratio and loading application angle could be explained by using the shape of fatigue fracture surface.

목차 (Table of Contents)

• Abstract
• 1. 서론
• 2. 실험
• 3. 실험결과 및 고찰
• 4. 결론
• References