期刊
ADVANCED COMPOSITE MATERIALS
卷 32, 期 5, 页码 657-673出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09243046.2022.2128267
关键词
thermoplastic composites; induction welding; joining; hygrothermal conditions; single-lap shear strength
This study investigated the impact of hygrothermal conditions on the single-lap shear strength of CF/PEKK thermoplastic composites. The results demonstrated a significant reduction in strength and changes in fracture surfaces and failure modes under high-temperature conditions. Additionally, exposure to a moist environment altered the failure mode.
This study analyzed the effects of hygrothermal conditions on the single-lap shear strength of a carbon fiber/poly-ether-ketone-ketone (CF/PEKK) thermoplastic composite material fabricated by induction welding. Specimens were exposed to an 85 degrees C/85% environment using a temperature and humidity chamber to identify the effect of moisture on single-lap shear strength, while their moisture saturation was assessed through weight measurement. Single-lap shear strength tests were performed on the dried and saturated specimens at 25 degrees C and 100 degrees C to 180 degrees C at 20 degrees C intervals. At 160 degrees C, the strength of the CF/PEKK thermoplastic composites rapidly declined to 76% (dried specimens) and 78% (moist specimens). The fracture surfaces and failure modes were analyzed using scanning electron microscopy images, which confirmed an increase in the degraded areas and naked fibers at higher testing temperatures. In addition, it was found that exposure to a moist environment changes the failure mode from fiber bundles and fiber/matrix failure to naked fiber and matrix failure owing to the reduction in interfacial adhesion properties. The findings confirmed that hygrothermal conditions directly affect the degradation of the CF/PEKK thermoplastic composites and that a rapid reduction in the single-lap shear strength occurs above T-g.
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