A major weakness of laminated composite is the susceptibility to delamination. Having a good understanding of composite material resistance to interlaminar fracture and fatigue is important to establish design allowable and damage tolerance guidelines for structures. Previously reported static delamination test results have shown that there is about 100% improvement in the critical energy release rates GIC by adding 1wt% carbon nanofibers (CNFs) to glass fiber/polyester laminates. Hence, this paper presents the fatigue resistance characterization of glass fiber/polyester composite modified with CNFs. CNFs were surfactant treated and dispersed in the thermoset polyester. The matrix with suspended CNFs was infused into glass fiber preform through vacuum assisted resin transfer molding (VARTM). The crack development of the laminated specimens during fatigue delamination testing was recorded along with the displacement and cyclic load applied. The fatigue measurement results for the traditional composite laminate and the one modified with CNFs is compared to understand the role of CNFs in the fatigue delamination process. It was found that CNFs significantly improve the low cycle fatigue performance, but it provides minimal improvement to the high cycle fatigue performance.

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