목차

Ⅰ. 서 론
1. 연구 배경 및 목적 ·················································································1
2. 연구 동향 ·································································································3
Ⅱ. 이론적 배경
1. Goodman 방정식 ····················································································5
2. Miner 법칙 ································································································6
3. J-적분·········································································································6
4. 임계균열길이·····························································································8
5. 잔존수명 예측 ···························································································8
Ⅲ. 실험
1. 하중이력측정
1) 연속식하역기의 모션 분류····························································10
2) 하중조건····························································································11
3) 운전이력····························································································12
4) 하중측정 장치 및 스트레인게이지··············································13
5) 스트레인게이지 설치······································································14
6) 측정결과····························································································16
2. 인장시험
1) 시험편 및 시험장치········································································18
2) 실험방법····························································································20
3) 실험결과····························································································20
3. 피로시험
1) 시험편 및 시험장치········································································23
2) 실험방법····························································································23
3) 실험결과····························································································24
4. 파괴인성시험
1) 시험편 및 시험장치········································································26
2) 실험방법····························································································26
3) 실험결과····························································································28
5. 피로균열진전시험
1) 시험편 및 시험장치········································································33
2) 실험방법····························································································34
3) 실험결과····························································································35
Ⅳ. 실험결과 분석
1. 연속하역기 하중이력 분석 ·································································39
1) 무부하시 동작별 하중이력 분석··················································39
2) 부하시 하중이력 분석····································································43
3) Rainflow Counting을 이용한 하중이력 분석···························44
2. 피로수명 예측 ·······················································································48
1) Goodman 방정식을 이용한 피로수명 예측·······························48
2) Miner 법칙을 이용한 피로수명 예측 ·········································49
3. 파괴인성시험 파단면 관찰 및 균열진전량 비교 ···························50
4. 유한요소해석에 의한 파괴인성 계산 ···············································52
1) 전처리 ································································································52
2) 후처리 ································································································54
3) 해석결과분석 ····················································································56
5. L-Holder 잔존수명 예측······································································58
1) 초기균열길이에 따른 한계균열길이 에측··································58
2) 검출균열길이에 따른 L-Holder 수명에측·································59
3) 잔존수명 예측결과 기반 검사주기 선정 ································62
Ⅴ. 결론 ··············································································································64
참 고 문 헌 ·······································································································66
ABSTRACT ····································································································72