수중강판의 결함 및 열화 검출을 위한 탄성파 유한요소 시뮬레이션
Finite Element Simulation of Elastic Waves for Detecting Defects and Deteriorations in Underwater Steel Plates
1
조회
0
다운로드
0
인용
0
참고문헌
키워드
초록
This paper presents the results of finite element simulations of elastic wave propagation in an underwater steel plate and the verification of a proposed method utilizing elastic wave‐based damage detection. For the simulation and verification, we carried out the following procedures. First, three‐dimensional finite element models were constructed using a general purpose finite element program. Second, two types of damages (mechanical defects and deteriorations) were applied to the underwater steel plate and three parameters (defect location, defect width, and depth) were considered to adjust the severity of the applied damages. Third, elastic waves were generated using the oblique incident method with a Gaussian tone burst, and the response signals were obtained at the receiving point for each defect or deterioration case. In addition, the receivedtime domain signals were analyzed, particularly by measuring the magnitudes of the maximum amplitudes. Finally, the presence and severity of each type of damage were identified by the decreasing ratios of the maximum amplitudes. The results showed that the received signals for the models had the same global pattern with minor changes in the amplitudes and phases, and the decreasing ratio generally increased as the damage area increased. In addition, we found that the defect depth was more critical than the width in the decrease of the amplitude. This mainly occurred ecause the layout of the depth interfered with the elastic wave propagation in a more severe manner than the layout of the width. An inverse analysis showed that the proposed method is applicable for detecting mechanical defects and quantifying their severity.
Abstract
This paper presents the results of finite element simulations of elastic wave propagation in an underwater steel plate and the verification of a proposed method utilizing elastic wave‐based damage detection. For the simulation and verification, we carried out the following procedures. First, three‐dimensional finite element models were constructed using a general purpose finite element program. Second, two types of damages (mechanical defects and deteriorations) were applied to the underwater steel plate and three parameters (defect location, defect width, and depth) were considered to adjust the severity of the applied damages. Third, elastic waves were generated using the oblique incident method with a Gaussian tone burst, and the response signals were obtained at the receiving point for each defect or deterioration case. In addition, the receivedtime domain signals were analyzed, particularly by measuring the magnitudes of the maximum amplitudes. Finally, the presence and severity of each type of damage were identified by the decreasing ratios of the maximum amplitudes. The results showed that the received signals for the models had the same global pattern with minor changes in the amplitudes and phases, and the decreasing ratio generally increased as the damage area increased. In addition, we found that the defect depth was more critical than the width in the decrease of the amplitude. This mainly occurred ecause the layout of the depth interfered with the elastic wave propagation in a more severe manner than the layout of the width. An inverse analysis showed that the proposed method is applicable for detecting mechanical defects and quantifying their severity.
참고문헌 (15)
- 정준모, "조선 해양 구조물용 강재의 소성 및 파단 특성 II: 파단의 이론적 배경", 한국해양공학회지, 25(2), pp.92~100 (2011), 한국해양공학회
- Descamps, B., "Reliability-based Methods in the Inspection Planning of Fixed Offshore Steel Structures", Journal of Constructional Steel Research, 52(1), pp.117~131 (1999)
- Dinkler, D., "Damage detection with piezoceramic actuators in thin steel structures", Mechanics of Advanced Materials and Structures, 15(3-4), pp.269~275 (2008)
- Dowling, P. J., "Steel Structures in the New Millenium", Journal of Constructional Steel Research, 46(1-3) (1998)
- Kažys, R., "3D Analysis of Interaction of Lamb Waves with Defects in Loaded Steel Plates", Ultrasonics, 44, pp.e1127~e1130 (2006)
- 김종규, "Finite element simulation of two-point elastic wave excitation method for damage detection in concrete structures", RUSSIAN JOURNAL OF NONDESTRUCTIVE TESTING, 44(10), pp.719~726 (2008), MAIK NAUKA[DOI]
- 이주원, "알루미늄-에폭시-알루미늄 접착판에서 에폭시 두께 검사를 위한 유도초음파 수치시뮬레이션", 한국해양공학회지, 23(6), pp.117~123 (2009), 한국해양공학회
- Melchers, R. E., "The Effect of Corrosion on the Structural Reliability of Steel Offshore Structures", Corrosion Science, 47(10), pp.2391~2410 (2005)
- 나원배, "Effect of Surface Condition and Crrosion-induced Defect on Guided Wave Propagation in Reinforced Concrete", 한국해양공학회지, 20(6), pp.1~6 (2006), 한국해양공학회
- Onoufriou, T., "Reliability Based Inspection Planning of Offshore Structures", Marine Structures, 12(7-8), pp.521~539 (1999)
- Ostachowicz, W., "Damage localisation in plate-like structures based on PZT sensors", Mechanical Systems and Signal Processing, 23(6), pp.1805~1829 (2009)
- Wang, X., "Experimental Investigation of Reflection in Guided Wavebased Inspection for the Characterization of Pipeline Defects", NDT&E International, 43(4), pp.365~374 (2010)
- 우진호, "단면 겹치기 접착 조인트에 존재하는 비대칭 결함 탐지를 위한 탄성파 유한요소 시뮬레이션", 한국해양공학회지, 23(6), pp.124~130 (2009), 한국해양공학회
- 우동우, "유도초음파를 이용한 수중 강관의 기계적 결함 검출", 한국해양공학회지, 24(1), pp.140~145 (2010), 한국해양공학회
- 우진호, "Finite Element Simulation of Elastic Wave Propagation in a Concrete Plate - Modeling and Damage Detection", 한국해양공학회지, 21(6), pp.26~33 (2007), 한국해양공학회