Comparison of static and fatigue interlaminar testing methods for continuous fiber reinforced polymer composites

摘要

reinforced epoxy (CF/EP) composite and a carbon fiber/multiwalled carbon nanotube reinforced epoxyud(CF/MWCNT/EP) hybrid nanocomposite. The first, conventional fatigue testing method was the endnotchedudflexure (ENF) test, which was used as a reference. The second, novel technique was the fatigueudinterpretation of the double-notch shear (DNS) test. Both tests have been performed with static andudcyclic loading to compare the evaluated properties of the different systems, the effect of transition fromudcyclic to fatigue loading and to demonstrate if the complex ENF test can be replaced by the simpler DNSudtest.udThe test results showed the slight beneficial effect of the nanoreinforcement in both static and cyclicudload conditions, and the possibility to use the DNS test for fatigue testing of continuous fiber reinforcedudcomposites. The SEM micrographs taken of the fracture surfaces of the composites after the differentudinterlaminar tests provide valuable data on the interlaminar failure phenomena of hybrid nanocompositesudin both static and fatigue loading conditions.