Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 85, Issue -, Pages 31-39Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2016.03.007
Keywords
Thermoplastic resin; Interface/interphase; Mechanical testing; Adhesion
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Interface thickness and modulus of carbon fiber (CF) reinforced polyamide 6 (PA 6) composites with different thermal histories are characterized as 331-394 nm and 0.24-0.30 times to fiber modulus, respectively. Transverse fiber bundle (TFB) test is firstly employed for evaluating semi-crystalline PA 6 interfacial adhesion. TFB Failure mechanisms are schematically given. Besides enhanced molecular entangling on fiber surface, increased matrix toughness is also found to have a great effect on improved TFB results. Droplet micro-debonding results show that decreasing cooling rate and increasing annealing temperature both decrease interfacial shear strength (IFSS) though residual PA 6 on carbon fiber surface increases. In the end, the above data are normalized together with some previous measured parameters. It shows that quenching of the CF/PA 6 composites and subsequent annealing are shown to give similar results as slow cooling. Relationships between each other are also discussed. (C) 2016 Elsevier Ltd. All rights reserved.
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