Interfacial phenomena in metallic z-reinforced CFRP joints after hygrothermal ageing
The reciprocal impact of surface pretreatment for metallic z-reinforcing sheets and exposure of reinforced carbon composite joints to hot/wet environment (70 °C, 85 % RH) on the mechanical interlocking and adhesion between reinforcements and laminate is investigated. Moisture ingress potentially causes a significant increase of delamination resistance. Reinforced joints experience compressive stress between laminate and reinforcements due to the swelling of the laminate such that surface pretreatment’s impact decreases and the effect of the metal’s coefficient of thermal expansion increases. Surface analyses through scanning electron microscopy (SEM) and x-ray photoelectron spectroscopy (XPS) indicate combined mechanical adhesion and chemisorption promoted by laser pretreatment to be the most moisture resistant mechanism of adhesion.
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