A crack arrester has been recently developed to suppress crack propagation along the interface between a facesheet and a core in a foam core sandwich structure. The crack arrester has semi-cylindrical shape and is inserted into the interface. The crack arrester decreases an energy release rate at the crack tip by suppressing local deformation around the crack. If the arrested crack can be instantaneously detected, the reliabilities of the structures are dramatically improved. This study establishes an innovative crack detection technique using two fiber Bragg grating (FBG) sensors embedded at both edges of the arrester. The change of the strain distribution in the crack arrester induced by arresting the crack is evaluated using reflection spectra from the FBG sensors. The proposed technique enables an effective application of the crack arrester and significantly improves the reliability of the foam core sandwich structures.
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Minakuchi, S., Yamauchi, I., Takeda, N., Hirose, Y. (2009). Detection Of Arrested Crack For Foam Core Sandwich Structures Using Optical Fiber Sensors Embedded In A Crack Arrester. In: Bos, M.J. (eds) ICAF 2009, Bridging the Gap between Theory and Operational Practice. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-2746-7_12
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DOI: https://doi.org/10.1007/978-90-481-2746-7_12
Publisher Name: Springer, Dordrecht
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