Journal of the Korean Institute of Gas (한국가스학회지)
- Volume 3 Issue 1
- /
- Pages.1-7
- /
- 1999
- /
- 1226-8402(pISSN)
- /
- 2713-6922(eISSN)
Fatigue Behavior of Before-and-After Penetration of Aluminium Plate with Long Surface Crack
긴 균열을 갖는 알루미늄판재의 관통전후 피로거동
- Nam Ki-Woo (Pukyong Nat. University, Dept. of Material Eng.) ;
- Lee Jong-Rark (Korea Gas Safety Corporation, R&D Center) ;
- Ahn Seok-Hwan (Pukyong Nat. University, Dept. of Material Eng.)
- Published : 1999.03.01
Abstract
Fatigue behavior of before-and-after penetration was examined experimentally using surface pre-cracked specimens of aluminium alloy 5083-0. The fatigue crack shape before penetration is almost semicircular, and the measured aspect ratio is larger than the value obtained by calculation using K values proposed by Newman-Raju. It is found that the crack growth behavior on the back side after penetration is unique and can be divided into three stages. By using a crack propagation rule in case of long surface crack, the change in crack shape after penetration can be evaluated quantitatively.
알루미늄합금(5083-0)의 표면균열시험편의 관통전후의 피로거동을 조사하였다. 관통전의 피로균열형상은 거의 반타원형이며, 측정된 형상비는 Newman-Raju식의 K를 이용하여 계산한 값보다 더 크다. 관통후의 뒷면에서의 피로균열성장거동은 거의 유사하였으며 3영역으로 나누어졌다. 표면균열길이가 긴 경우, 피로균열전파법칙을 사용함으로서 표면균열재의 판두께 관통후의 피로균열 전파특성을 정량적으로 평가될 수 있음을 알 수 있었다.