This paper presents modal-based structural damage detection. Specifically, we focus on localized flexibility properties that can be deduced from the experimentally determined global flexibility matrix. We describe the damage detection theory that can be viewed a generalized flexibility formulation in three different generalized coordinates, viz., localized or substructural displacement-basis, elemental deformation-basis and element strain-basis. The three localized flexibilities are applied to a CFRP plate having internal damage. The results show that the elemental strain-basis flexibility is the most accurate in detecting the damage of the CFRP laminates.
References
1.
1. Doebling, S.W.et al. (1996). Damage identification and health monitoring of structural and mechanical system from changes in their vibration characteristics: A literature survey. Los Alamos National Laboratory, Report No. LA-12767-MS, Los Alamos, NM.
2.
2. Park, K.C., Reich, G.W. and Alvin, K.F. (1997). Damage detection using localized flexibilities. In: Chang, F.K. (Ed.), Structural Health Monitoring, Current Status and Perspectives. Technomic Pub. pp. 125-139.
3.
3. Byon, O.I., Aoki, Y., Yamaguchi, T., Park, K.C. and Reigh, G.W. (July 1999). Damage detection of CFRP laminates composites by localized flexibility method. In: TCA-ICCM12 (Ed.), Proceedings of 12th International Conference on Composite Materials. p. 375.
4.
4. Park, K.C. and Felippa, C.A. (March 65/1, 1998). A variational framework for solution method developments in structural mechanics. In: ASME Pub. Journal of Applied Mechanics, 242-249.
5.
5. Park, K.C. and Reich, G.W. (2000). Model-based health monitoring of structural systems: progress, potential and challenges. In: Chang, F.K. (Ed.), Structural Health Monitoring 2000. pp. 82-95.
