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A glass fiber reinforcement plastic bolt (FRP bolt) has several good properties such as corrosion resistance or electrical insulation. Therefore, it exhibits an excellent performance in a suitable service environment or operation condition.In this study, the FRP bolt which has center roving and braid structure was fatigued under controlled load at 293K and 77K. And its deformation behavior during a fatigue process and its fatigue life were discussed based on the change of crack density in the FRP bolt.As the results, the following conclusions are obtained:(1) The fatigue strength of three types of FRP bolts tested became lower as its tensile strength became low. Especially, when the diameter of center roving in the FRP bolt decreased, the fatigue strength became below enormously.(2) No crack was observed in the center roving region. But it was clarified that the change of crack density observed in a braid region corresponded to the increment of displacement at a maximum or a minimum load, and that the cyclic range of displacement did not change so much.(3) There was a period in the fatigue process, in which the displacement at a maximum load increased linearly. By using the increment of displacement per cycle in this period, the fatigue lives were able to be expressed by only one curve regardless of bolt types, but it depended on test temperature.

Fatigue Strength of FRP Bolt Having Braid Structure at 293K and 77K.