温水中に長期間浸漬されたGFRPの損傷状態と超音波エコーの関係

概要

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This study was conducted to investigate damage condition of glass-fiber reinforced plastic (GFRP) which was immersed in hot water for a long time. Furthermore, we aimed to establish a non-destructive method based on ultra-sonic echo data for estimating the damage condition and strength of GFRP. For those purposes, we made three kind of GFRPs in which base resins (isophthalic-type UP, bisphenol-type VE and novolak-type VE) possessed different corrosion resistance, and then immersed them in hot water maintained at 368K for 2.6-31.1Ms (1-12 months). The GFRP, whose base resin was isophthalic-type UP possessing relatively low corrosion resistance, suffered to remarkable damage such as interfacial debonding between glass-fibers and the base resin, delamination of glass-fiber cloths and cracking of glass-fibers, so that the bending strength was rapidly reduced. On the other hand, the damage condition in the other GFRPs was not striking because of the base resins having higher corrosion resistance, and their bending strengths were maintained at relatively high levels. Moreover, since the damage condition of the GFRPs was reflected to the ultra-sonic echo data, the bending strengths could be roughly estimated by such data.
社団法人日本機械学会の論文
2009-02-25