Temperature field evolution and thermal-mechanical interaction induced damage in drilling of thermoplastic CF/PEKK – A comparative study with thermoset CF/epoxy

Although new generation carbon fibre reinforced thermoplastic (CFRTP) such as polyetherketoneketone (CF/PEKK) is a promising sustainable alternative to the conventional thermoset plastic (CFRP), there lack of literature regarding its machining performance. This first study unveiling temperature evolution during drilling CF/PEKK and potential impact on associated material damages. Through comparative with CF/epoxy, disparate performance two composites has been uncovered, results were found be closely related materials' thermal/mechanical properties. Specifically, produces continuous chips due excellent ductility thermal sensitivity, whereas CF/epoxy segmented brittle nature. generates up 40 N (50.5 %) higher thrust force, 87.6 °C (98.9 hole wall 61.1 (48.8 chip than that CF/epoxy. correlated longer tool-chip contact length unique morphology. Despite greater force/temperature generation, shows 55.7 % lower delamination damage compared this owning interlaminar toughness. establishes more in-depth understanding into also provides guidance high manufacturing next composites.