Comparison of the Fatigue Performance of Woven and Non-Woven CFRP (Carbon Fiber Reinforced Plastics) Laminates

摘要

Static and fatigue tests were carried out at room temperature on CFRP laminates with five lay-ups, of woven and non woven CFRP. Carbon fiber reinforced plastics made with woven fabric have significantly poorer static and fatigue performance than non woven material, due to distortion of the load carrying 0 deg fiber. When woven fabric is oriented at 45 deg to the load direction the tensile static and fatigue performance is slightly better than in non woven + or - 45 deg material. Replacing the + or - 45 deg layers of a (+ or - 45.0) laminate with woven fabric has little effect on the static or fatigue strength. In non woven material, notched coupons under fatigue loading do not show the notch sensitivity that is so significant under static loading. However, in woven material, because of the additional fatigue degradation processes associated with two crossover points in the weave, holed coupons never quite achieve notch insensitivity in fatigue.