Fatigue Damage and Fracture of Carbon Fabric/Epoxy Composites under Tension-Tension Loading

概要

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The degradation of a plain woven carbon fiber/epoxy composite under tension-tension fatigue loading was studied in this work. An almost flat S-N diagram was obtained for this composite. As high as 85% fatigue strength of the static strength at 10^6 cycles was recorded. A new specimen configuration was developed and used. That is, the specimen has two narrow sections. After the specimen fails at one section under static or cyclic loading, the residual strength of the other section will be statically measured. The residual strength for specimens failing under static and cyclic loadings is higher than the static strength for the virgin specimen. A typical S-shape stiffness reduction against logarithmic cycle number is found for high-cycle-fatigue specimens. However, sudden fatigue death of the specimens occurs with no indications in both S-S curves and AE events. Parameters of the parabolic function which fits the convex S-S curve are more sensitive to the stiffness reduction than the observed stiffness. Microscopic examination of the fracture surface was conducted. From those observations, a fatigue damage process model is proposed.
一般社団法人日本機械学会の論文
1994-10-15