두께변화가 있는 복합재 평판의 램파 전파특성
The characteristics of Lamb waves in a composite plate with thickness variation
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본 논문은 램파(Lamb waves)를 이용한 능동검사시스템을 구조 건전성 모니터링 시스템에 적용하기 위하여 램파의 특성연구를 수행하였다. 연구는 보다 실제 구조물에 근접한 구조물을 고려하여 두께변화가 있는 준등방성 복합재 평판을 대상으로 PZT 탐촉자(transducer)를 표면에 부착하여 수행하였다. 본 연구에서는 두께변화로 인한 램파의 전파특성을 분석하기 위하여 간단하지만 새로운 기법을 적용하였다. 본 연구의 결과는 램파의 전파특성은 상대적으로 얇은 구조물에 민감하였고 두께변화가 램파의 전파에 미치는 영향을 보여 주었다. 또한 본 연구에 사용한 분석기법은 램파를 이용한 구조 건전성 모니터링에 적용할 수 있는 가능성을 보여주었다.
Abstract
An active inspection system using Lamb waves for structural health monitoring was considered in this paper. In order to understand the characteristics of the Lamb waves propagating in a composite plate, the experiment was performed for a quasi-isotropic composite plate with thickness variation. Lamb waves were generated and received by the thin PZT transducers bonded on the surface. In this test, a simple new technique was tried for characterizing the Lamb waves propagating across the discontinuity due to the thickness variation. The results showed that Lamb waves were more sensitive to the thinner plate with faster group velocity and that the thickness change in composite plate was detectable. Consequently, the potential of applying this technique to structural health monitoring was verified.
참고문헌 (10)
- "Smart Materials and Structures", london, pp.1992~
- "Smart materials and structures; what are they?", 5(3), pp.247~254 (1996)
- "In-Situ Sensor-Based Damage Detection of Composite Materials for Structural Health Monitoring"
- "Mode and Transducer Selection for Long Range Lamb Wave Inspection", 12, pp.553~565 (2001)
- "The Interaction of Lamb Waves with Defects IEEE Transaction on ultrasonics", 39(3), pp.381~397 (1992)
- "Lamb wave method for quick inspection of impact-induced delamination in composite laminates", 64 (2004)
- "Integrity assessment of composite repair patch using propagating Lamb waves", 58, pp.363~371 (2002)
- "Propagation of ultrasonic guided waves in lap-shear adhesive joints Case of incident a0 Lamb wave", 115, pp.146~156 (2004)
- "Health monitoring of a composite wingbox structure" (2004), in process.
- "Ultrasonic Waves in Solid Media" (1999), Cambridge University Press