| 학회 |
한국재료학회 |
| 학술대회 |
2015년 가을 (11/25 ~ 11/27, 부산 해운대그랜드호텔) |
| 권호 |
21권 2호 |
| 발표분야 |
D. 구조 재료 |
| 제목 |
Neutron Diffraction Investigation of Fatigue Crack Propagation in Stainless Steel |
| 초록 |
Fatigue crack growth behaviors of the as-fatigued and tensile-overloaded compact-tension (CT) specimens were investigated using in-situ neutron diffraction. The stress mapping experiments have been carried out using Residual Stress Instrument (RSI) at the High-Flux Advanced Neutron Application Reactor of the Korea Atomic Energy Research Institute. Residual stress distributions were examined as a function of distance from the crack tip along the crack-growth direction at the mid-thickness and near the surface using 1-mm spatial resolution of neutron beam. In addition, evolution of stress fields around the fatigue crack tip was investigated along the through-thickness direction under in-situ loading. The results show that the residual stress fields at the surface were much larger than those at the mid-thickness. A transfer rate of stress concentration at the crack tip was faster at the mid-thickness than the surface, which results in a higher driving force of crack growth and therefore a faster crack growth rate at the mid-thickness. |
| 저자 |
이수열1, 우완측2, 최규동1, 서석호1
|
| 소속 |
1충남대, 2한국원자력(연) |
| 키워드 |
Fatigue crack growth; Stress field; Crack tip; Neutron diffraction
|
| E-Mail |
|
