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Application of Localized Flexibility Method to Damage Detection of CFRP Space Frame

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 present the underlying 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. Then, the present methods are applied to a CFRP filament winding pipe and a space frame structure made of welded tubular members having interior damage and the numerical and experimental results show that the present method is quite useful for detecting the damage location of the CFRP pipe and the space frame structure.