Towards understanding the hole making performance and chip formation mechanism of thermoplastic carbon fibre/polyetherketoneketone composite

Here, we report the first study on hole making performance of thermoplastic carbon fibre/polyetherketoneketone (CF/PEKK) composite. Different methods (conventional drilling vs. helical milling) have been compared and effect different feed rates has investigated. The thermal-mechanical interaction resulting damage elucidated for time fibre reinforced thermoplastics (CFRTPs) making. In material science dimension, advanced characterization techniques deployed to reveal removal mechanisms at microscopic scale unveil underlying structural change a molecular level. Results show that delamination CF/PEKK is result interaction. For conventional drilling, high machining temperature (at low rate <0.1 mm/rev) stronger influence starts dependence thrust force >0.1 mm/rev. contrast, milling generates much higher which plays more predominant role in associated damage. Microstructural analysis shows all surfaces feature matrix smearing, as combined in-plane shear stress temperature. Conventional leads severe wall microstructural (matrix loss surface cavity) milling. Finally, thermal reveals process led significantly increased crystallinity PEKK strain-induced crystallization under