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Mode II fatigue crack growth behaviors were investigated with two kinds of unidirectional carbon/epoxy laminates, M 40 J/2500 and T 300/3601, under constant 〓K_II conditions. The crack growth tests were conducted with end notched flexure (ENF) speciments. Tests were carried out from 1 to 20 Hz at a load ratio of 0.5 either in air or in water. In M 40 J/2500 laminates, either in air or in water, the crack propagation rate was almost constant with crack extension, and the crack growth was cycle-dependent. The crack propagation rate in air was almost identical to that in water. In T 300/3601 laminates, either in air or in water, the crack propagation rate was also constant with crack extension, and the crack growth was time-dependent. The crack propagation rate in water was faster than that in air, and it increased with prior-immersion period in water. The crack propagation rate at 70℃ was slightly higher than that at 25℃.
