Smart Honeycomb Sandwich Panels with Damage Detection and Shape Recovery Functions : —Dynamic Detection of Impact Damages and Recovery of Mechanical Properties—

概要

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In this research, fiber Bragg grating (FBG) sensors that were a kind of optical fiber sensors and shape memory alloys (SMA) were incorporated into honeycomb sandwich structures for development of smart panels with damage detection and shape recovery functions. Especially, in this paper, impact damages in honeycomb sandwich panels with CFRP skins were targeted. A MEMS optical spectrum analyzer that can measure the reflection spectrum of an FBG sensor at high speed was introduced. Then, the difference in the size and location of impact damage in the sandwich panel was detected from the difference of deformation process in the reflection spectrum during the impact loading. On the other hand, the impact damage was attempted to be repaired by manufacturing of the honeycomb core from SMA foils. As a result, the typical mechanical properties, such as the bending stiffness and the in-plane compressive strength, were confirmed to be recovered along with the shape recovery of the sandwich panel by heating.