Damage detection of CFRP pipes and ladder structure by using localized flexibility method

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Damage detection of CFRP pipes and ladder structure by using localized flexibility method

Aoki, Y. / Shoji, A. / Byon, O.I.

The change of rigidity ratio that utilizes the three localized flexibilities has been applied to the damage detection of CFRP composite pipes and shells. The free-free localized flexibility and the deformation-basis flexibilities can make use of conventional output data such as acceleration or displacement. The strain-basis localized flexibility can utilize a combination of the conventional modal testy output as weil as the strain output. Then, the damage detection of CFRP filament winding pipe has been carried out by using strain gage records. The main features of the present study are summarized as follows: 1) The relative accuracy fidelities of the three localized flexibilities are evaluated as applied to the damage detection of CFRP composite pipes analytically. All three flexibility methods accurately captured the locations of rigidity changes. Among the three, the strain-basis flexibility method is most accurate; 2) By using the global flexibility of CFRP filament winding pipes determined by first three strain eigenmodes, damage detection art carried out by the strain-basis flexibility method. The result demonstrates that damage location is identified with high confidence as well as reasonably accurate change in the bending rigidity.