Abstract
Effects of stress ratio on the fatigue behavior of CFRP laminates at room temperature have been studied. First, constant-amplitude fatigue tests are performed on quasi-isotropic and cross-ply CFRP laminate for six kinds of stress ratios. The experimental results demonstrate a marked stress-ratio dependence of fatigue behavior. The constant fatigue life diagram is linear in the range of a short life and it turns quadratic in the range of a longer life. To construct such a non-similar constant fatigue life diagram, a phenomenological procedure is developed on the basis of the static strengths in tension and compression and the reference fatigue strengths at the compression-tension strength ratio. The fatigue lives predicted using the proposed method agree well with the experimental results over the range of fatigue life up to 10^6 cycles for all the stress ratios tested. It is also demonstrated that the proposed fatigue life prediction method promisingly works for the off-axis fatigue behavior of cross-ply CFRP laminates.
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