Abstract
Fatigue strength and the failure process of a hole-notched glass FRP under tension-torsion biaxial cyclic loading were investigated in this paper. Thin cylindrical specimens were used. Fibers of the reinforcement (plain woven glass cloth) were aligned parallel to the longitudinal and circumferential axes of the specimen. The damage state at each biaxial stress ratio (α : the ratio of normal stress to shear stress) was observed macroscopically and microscopically. The experiments reveal the following results. The damage progression is dependent on the biaxial stress ratio. When α=1/0, damage spreads radially from the hole, but only covers an area of π/4 to either side of the circumferential axis, in both directions along the circumferential axis. When α=0/1, damage progresses radially along both longitudinal and circumferential axes. We call each of these a fatigue band. Under biaxial loading, macroscopic and microscopic damage states have both types of damage at α=1/0 and α=0/1.
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