실 배관 파열시험을 통한 감육 Elbow의 손상압력 평가

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Wall thinning defect due to flow-accelerated corrosion (FAC) is one of the degradation mechanisms of carbon steel piping component in nuclear power plant (NPP), and it results in reducing load carrying capacity and fatigue resistance of the piping components. Especially, the wall-thinning defect leads to abrupt rupture of piping components under normal operating pressure. Thus, it is important to accurately evaluate the failure pressure of piping components containing an internal wall-thinning defect for ensuring integrity of piping system of NPP. Unfortunately, the failure pressure data on the internally wall-thinned pipe are very rear. For wall-thinned elbow, especially, there are no published data up to this time. Therefore, this study performed failure tests using real-scale elbows containing simulated wall-thinning defect under internal pressure and combined internal pressure and bending moment. Based on the results of experiments, the effect of thinning depth, thinning length, circumferential thinning angle and bending moment on the failure pressure was investigated. Also, these results were compared with failure pressure predicted by existing models.
The results of failure tests showed that the failure pressure decreased with increasing depth and it was decreased and saturated with increasing axial thinning length. There tendencies are similar as those observed from the straight pipe with local wall-thinning. Also, the failure pressure decreased with increasing circumferential thinning angle. This is different from that observed in the results of studies on the wall-thinned straight pipe. The effect of bending moment on the failure pressure was negligible. The comparison of failure pressures obtained from experiment and predicted by models showed that the existing models conservatively estimated the failure pressure of wall-thinned elbow, and reasonably predicted the effect of wall thinning length and depth. However, the models could not appropriately consider the effect of circumferential thinning angle and thinning location on the failure pressure.
Alternative Title
Evaluation of Failure Pressure of Wall Thinned-elbow by Real Scale Pipe Test
Alternative Author(s)
Na, Yeon Soo
조선대학교 대학원
일반대학원 원자력공학과
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Table Of Contents
표목차 = ⅲ
그림목차 = ⅳ
제 1 장 서론 = 1
제 2 장 실 배관 손상시험 = 3
제 1 절 유한요소해석을 통한 예비해석 = 3
1. 재료 = 3
2. 배관재료의 인장시험 = 4
3. 예비해석을 위한 유한요소해석 = 6
4. 예비해석 결과 = 7
제 2 절 시편 및 시험장치 = 12
1. 실 배관 손상 시편 = 12
2. 손상 시험 장치 = 17
제 3 절 실험절차 및 방법 = 19
제 3 장 손상시험 결과 및 토의 = 23
제 1 절 결함 형상에 따른 감육 엘보우의 손상압력 = 23
1. 결함 깊이에 따른 손상압력의 영향 = 23
2. 결함 길이에 따른 손상압력의 영향 = 25
3. 원주방향 결함 폭에 따른 손상압력의 영향 = 27
제 2 절 감육 엘보우 손상압력에 미치는 굽힘하중의 영향 = 29
제 3 절 감육 배관의 결함 손상부 관찰 = 32
제 4 장 손상압력 평가 모델과 비교 = 38
제 1 절 손상압력 평가 모델 = 38
1. Battelle Model = 38
2. Li's Model = 40
3. Kim's Model = 41
제 2 절 손상압력 평가 모델과 시험 결과 비교 = 42
1. 결함 깊이에 따른 손상압력의 영향 = 42
2. 결함 길이에 따른 손상압력의 영향 = 44
3. 원주방향 결함 폭에 따른 손상압력의 영향 = 45
제 5 장 결론 = 47
참고문헌 = 49
조선대학교 대학원
나연수. (2006). 실 배관 파열시험을 통한 감육 Elbow의 손상압력 평가.
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