Behavior of Fatigue Fracture for Carbon Steel with Surface Flaw

J. Ocean Eng. Technol. 1989;3(2):101-107.

Song Sam-Hong,O Hwan-Seop

미소결함을 갖는 탄소강재의 피로파괴거동

송삼홍,오환섭

고려대학교 기계공학과,경희대학교공과대학

Keywords: Non-propagating Crack, Articial Small Defect, Fatigue Limit, Limit Small Defect, Maximum Non-propagation Crack

핵심용어: 정류크랙, 인공미소결함, 피로한도, 한계미소결함, 최대정류크랙

Abstract

The behavior of fatigue was studied by using low carbon steel bar with microhole(artificial small defect) under the condition of rotary bending stress which is made artificially at smooth surface and round notch root. The results obtained can be summerized; The behavior of non-propagating cracks which are produced at both tips of small defect occurred to dissymmetry, and it is found to be double size of small defect. For the range of l>lc, threshold stress intensity is constant. However, for the range of l