Abstract
Increasing interfacial shear strength (IFSS) has been observed to improve fracture toughness within carbon fiber/epoxy laminates. However, a direct correlation between IFSS of carbon fiber surface treatments and open-hole compressive (OHC) strength has never been established. Here the effects of systematically altering electrochemical oxidation surface treatments (0, 2 and 3.4 Amps) and sizing deposition levels (Unsized, 1:15 and 1:20 dilution epoxy:water, respectively) to observe the correlation, if any, between microscale IFSS and laminate OHC strength. Increases in OHC strength of up to 30.2% relative to untreated and unsized fibers were observed and attributed to the surface treatments for sized fibers. No changes in OHC strength were observed when the surface treatment was altered for unsized fibers, suggesting a major role of the sizing in governing OHC strength. This is supported by OHC strength increases of up to 49.4% attributed to increased sizing deposition level.
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