Structural Fracture Monitoring with Fracture Sensors Made from Composites via the Internet

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  • 複合材製破壊センサを用いたインターネット利用構造破壊モニタリングシステム
  • フクゴウザイセイ ハカイ センサ オ モチイタ インターネット リヨウ コウゾウ ハカイ モニタリング システム

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Description

Seismic damage is significant for civil structures like bridges, highways, gas pipelines, water pipe lines and sewer pipelines. Sewer pipeline breakage is reported in some earthquakes. It is important to know damage state of the sewer pipelines suffered from earthquakes even though the recover of the sewer pipelines are not emergent. To know the damage, a low-cost structural-health-monitoring system is required. In the present study, a new distributed fracture sensor is developed using glass/carbon composites and a tiny embeddable Internet terminal. The Internet terminal has four A/D converter channels and web-server function. This can be embedded in glass composite structures. The new fracture sensor is made from glass/carbon composites. In one of the surface layers, the glass fiber is cut to make a crack starter. The crack start to grow by the large deformation, and the crack breaks electric conductance of the carbon black layer embedded in the glass composites. This causes electric voltage change when the voltage is applied, and the change is monitored through the Internet. Several experiments were performed to confirm the effectiveness of this system here. As a result, this system successfully provided the fracture information through the Internet.

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