Effect of Thermal and Moisture on Environmental Degradation of GFRP⁄stainless steel Adhesive Joints

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  • GFRP⁄ステンレス鋼接着継手の環境劣化強度に及ぼす温度と水分の影響
  • GFRP/ステンレス鋼接着継手の環境劣化強度に及ぼす温度と水分の影響
  • GFRP ステンレス コウ セッチャク ツギテ ノ カンキョウ レッカ キョウド ニ オヨボス オンド ト スイブン ノ エイキョウ

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Abstract

The environmental degradation of GFRP⁄stainless-steel adhesive joints exposed to high temperatures, high humidity, and submerged in water was studied. After the adhesive joints were degraded, fatigue tests were carried out on the joints at room temperature. The experimental results showed that short-term exposure to high temperature (85°C) or high temperature and high humidity (50°C∼60°C, 85%) slightly increased the fatigue strength of the adhesive joints. However, the joints'fatigue strengths degraded under high temperatures and high humidity decreased with increasing degradation time. Furthermore, the joints'fatigue strengths submerged in water at high temperatures is lower than that under the same high temperatures and high humidity. As a result of these experiments, it is clear that the effect of moisture on adhesive joints is very large. Furthermore, an evaluation method for degradation durability of adhesive joints was developed. The relationship between degradation temperature and degradation time was calculated. The retention ratio of fatigue strength on adhesive joints was evaluated using arrehenius plots.

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