Stress ratio effect on tension-tension fatigue behavior of angle-ply GFRP laminates

The effect of the stress ratio (R = σmin/σmax) on the fatigue behavior of (±45)2S angle-ply glass/epoxy composite laminates was investigated by comparing their mechanical, thermal, and optical properties under the stress ratio of 0.5 with previous fatigue results obtained under the stress ratio of 0.1. When the stress ratio was increased from 0.1 to 0.5, the fatigue life was enhanced at the same σmax and the slope of S-N curve decreased,...