Feito Sánchez, NorbertoDíaz Álvarez, JoséLópez Puente, JorgeMiguélez Garrido, María Henar2021-07-022021-07-022018-01-15Feito, N., Díaz-Álvarez, J., López-Puente, J. & Miguelez, M. (2018). Experimental and numerical analysis of step drill bit performance when drilling woven CFRPs. Composite Structures, vol. 184, pp. 1147–1155.0263-8223https://hdl.handle.net/10016/32985This paper focuses on the influence of the step drill bit geometry on the damage induced during drilling Carbon Fiber Reinforced Polymer materials (CFRPs). Step geometry designed with the aim of avoiding composite damage in CFRPs drilling, is compared to conventional twist configuration. Despite the reduction of thrust force and torque observed when using the step drill, the delamination was only reduced at low feed rates. A numerical model developed for the step geometry was validated with experimental data demonstrating its ability to predict thrust force and delamination for different values of feed rate and cutting speed. Numerical model allowed the development of a parametrical study. Finally, using a response surface methodology a mechanistic model and surface diagrams have been presented in order to help in the selection of optimum variables minimizing drilling induced damage.9eng© 2017 Elsevier Ltd.Atribución-NoComercial-SinDerivadas 3.0 EspañaDrillingCFRPNumerical modellingDelaminationresearch articleBiología y BiomedicinaIngeniería MecánicaMaterialeshttps://doi.org/10.1016/j.compstruct.2017.10.061open access11471155Composite Structures184AR/0000020838