Abstract
The effect of dilute acid solution on fatigue damage process of GFRP under tension-tension cyclic loading was investigated. Dilute sulfuric acid of pH=3.9 was used. This pH value is considered to be a level commonly found in acid rain. The conclusions are as follows. (1) When the specimen has been exposed to pH=3.9 acid for seventh months, the effect of pH=3.9 acid on fatigue strength is almost the same as that of city water. (2) The fatigue degradation of GFRP in pH 3.9 acid and city water is greater than that in air. (3) As the concentration of acid solution increases, the fatigue life becomes short due to fiber degradation. (4) As the immersion time increases, the fatigue life would decrease even in dilute acid solution whose concentration is as low as acid rain while city water gives no significant effect on the strength of glass fiber.
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